United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9711120091



NOTE:     This text document was processed from a scanned

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          strikeouts, redlines, and enclosures may not have

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                              The Boeing Company

                              P.O. Box 3707

                              Seattle, WA 98124-2207



November 3, 1997

G-1151-SJA-97-503



Document Control Desk

United States Nuclear Regulatory Commission

Washington, D.C. 20555



Reference:     a)   Boeing Letter G-1151-RSO-92-365 dated August 31,

                    1992; R. S. Orr to the NRC Operations Center



               b)   NRC Letter Docket No. 99901227 dated August 12, 1992;

                    L. J. Norrholm to R. S. Orr; Subject: Response to 10

                    CFR 21 Inquiry



Dear Sir or Madam:



In accordance with the reference correspondence and 10 CFR 21, Boeing is

sending the NRC the attached error notice(s) received from our former

software suppliers.  Because of unknown current addresses, the following

former customers were not notified:



     Reactor Controls, Inc.



     Echo Energy Consultants, Inc.



     Nuclear Applications and Systems Analysis Company (Japan)



     Nuclear Power Services



Error notices have been sent to our other former customers.



Very truly yours,



Sandra J.  Andrews

Nuclear Administrator

Phone: (206) 865-6248

FAX: (206) 865-4851

Mail Stop: 7A-33, or

e-mail: Sandra.Andrews@PSS.Boeing.com



Enclosure(s):  ANSYS Class3 Error Reports 97-35 thru 97-49, 97-02R1, 96-

               50R1, 96-38R1, ANSYS QA Notice QA-97-02, ANSYS Support

               Coordinator Bulletin SCB97-02 and ANSYS Class3 Error

               Summary Reports for Rev 5.3



                                   ANSYS, Inc.

                                   Southpointe

                                   275 Technology Drive

                                   Canonsburg, PA 15317



                                   October 24, 1997



Dear Class3 Error Recipient:



     Enclosed you will find ANSYS Class3 Error Reports 97-35 through 97-

49 along with 97-02 R1, 96-50 R1, 96-38 R1 and ANSYS QA Notice QA-97-02.

Also attached is ANSYS Support Coordinator Bulletin SCB97-02.



     Class3 Error Report 97-02 has been revised to expand the scope of

the error to include nonlinear permeable regions.  The originally issued

Class3 Error Report 97-02 erroneously stated "the energy in nonlinear

regions is correct".



     Class3 Error Report 96-50 R1 has been issued to include an

additional case of curved element edges and to narrow the scope of the

error for SOLID92 and PLANE2.



     Class3 Error Report 96-38 has been revised to include the

undocumenting of the SEPO field on the ASBL command at Release 5.4.



     ANSYS QA Notice QA97-02 was issued to inform customers of an error

in the Microsoft Fortran compiler which may result in memory becoming

unusable.



     The ANSYS Support Coordinator Bulletin (SCB97-02) contains

information pertaining to ANSYS Release 5.4.  It provides information

about known, non-Class3 errors In the ANSYS program and workarounds.



     I would like to remind you of the various ways that ANSYS Inc.

provides Class3 error information.  Quarterly, Class3 errors are

delivered by mail to the ANSYS Support Coordinator listed on your ANSYS

license agreement.  Please forward any personnel or address changes to

your local ANSYS Support Distributor (ASD) promptly to that these reports

can be delivered.



     For users desiring access to Class3 errors on a more timely basis

you can be added to our email distribution list.  To register for email

notification of reports, simply send an email request including your

email address, company name/address and ANSYS agreement number to

bonny.podolek@ansys.com.  If you are a subscriber to email distribution,

please keep us informed of any changes in your email address by emailing

bonny.podolek@ansys.com.



     Finally, Class3 Errors and QA Notices are posted on ANSYS's Internet

HomePage.  The address is http://www.ansys.com.  They are located in the

ANSYS Zones section of the HomePage under Customer.  The username to

enter this area is "customer" and the password is "ain1fm" (the acronym

for ANSYS is number 1 for me).



     For your convenience, also enclosed you will find Release 5.3 ANSYS

Class3 Error Summary Reports sorted both by error number and keyword and

a description of ANSYS Service Packs which are available on ANSYS's

Internet HomePage.



                                   Sincerely,



                                   William J.  Brian

                                   Quality Assurance Manager



                                   ANSYS, Inc.

                                   Southpointe

                                   275 Technology Drive

                                   Canonsburg, PA 15317



                           ANSYS SERVICE PACKS



In keeping with the tradition of a strong commitment to our customers,

ANSYS, Inc.  has developed a strategy to provide timely corrections to

ANSYS software product releases.  ANSYS Service Packs (ASPs) are created

when an important product correction is needed to provide improved ANSYS

software product functionality.  Currently, ASPs are available for the

second release of ANSYS 5.3 and will be available for subsequent

releases.



Within a typical ANSYS Service Pack, users will find a description of the

product improvement and the method of providing the improvement, which

may be object file(s) relinkable into ANSYS, or they may contain non-

relinkable improvements such as a macro, a UIDL function, or a script.

This method enables delivery of an ANSYS product correction in a timely

manner without having to wait for the next ANSYS software release.  In

addition, the ASP may contain input and output files for checking proper

installation of the ASP.



To access the currently available ANSYS Service Packs, users must possess

a valid Technical Enhancement and Customer Support agreement (TECS).

ANSYS, Inc.  or an ANSYS Support Distributor (ASD) can provide customers

with a TECS agreement.



To obtain additional information regarding ASPs, access the ANSYS web at

http://www.ansys.com/ and click on the Software Update Manager area found

under the Service, Support link.  There, users will find answers to

questions such as "What are ASPs?," or most importantly, "How can I

obtain an ASP?" Additional information located at the Software Update

Manager area includes Version Information for ANSYS 5.3 and subsequent

releases, descriptions of the currently available ASPs, instructions on

how to install and implement an ASP, and how to obtain ASP Technical

Support.



                  ANSYS Release Identifier Description



ANSYS release identifiers consist of a major release level, a minor

release level, a correction and a build date.  An example of how this is

constructed is shown below:



                      5.3 UP030797 <--- build date (form = UPmmddyy)

                      ^ ^

                      | |

                      | |

major release level __  __ minor release level



Major release level changes indicate that new features have been added to

the program and that some level of program architecture change and/or

file structure may have occurred.  Minor release level changes also

indicate that new features have been added to the program, but files are

upwardly compatible.  All known error fixes are included in both minor

and major releases.  The build date corresponds to the date the program

was created.  Special versions may be provided to circumvent an error and

are identified by build date.  Special versions are not general releases

to all ANSYS licensees, since they typically represent error corrections

occurring only on one system, a subset of our customers who have specific

graphics devices, etc.



When a release identifier on a Class3 Error Report does not include a

build date, all build dates for the indicated release level are included.

When a release identifier for FIRST INCORRECT VERSION explicitly includes

a build date, the release level with the indicated build date as well as

all earlier build dates for that release level are affected.  When a

release identifier for CORRECTED IN explicitly includes a build date, the

release level with the indicated build date as well as all subsequent

build dates contain the correction.



For example, a Class3 Error Report with "5.3 UP100396" for FIRST

INCORRECT VERSION and "5.5 UP063098" for "CORRECTED IN" would apply to

all 5.3 releases with a build date UP 100396 or later, all 5.4 releases

(regardless of build date) and all 5.5 releases with a build date earlier

than UP063098.



The ANSYS release identifier(s) shown under "corrected in" on the front

side of Class3 Error Reports indicates the first possible release that

contains the correction.



An identifier indicated under "corrected in" does not guarantee that a

general distribution of that release of ANSYS will occur.  It does

indicate that the correction is known and implemented in that or any

subsequent release.



                          Product Applicability



The ANSYS family of component products occasionally undergoes name

changes between releases and/or changes in the functionality of derived

products (such as ANSYS-PC/LINEAR).  To minimize the potential for

confusion in these areas, unless otherwise noted on the front side of the

Class3 Error Report, the error report applies to all ANSYS family

products (including standalone component products) that contain the

described feature(s) in the designated release(s).



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-35

KEYWORDS:                SYSTEM              CRAY



DESCRIPTION OF ERROR:



     Incorrect results may be produced intermittently for any analysis

executed on CRAY T90 computer systems if the system is run with

bidirectional memory (default).  According to Cray Research's Field

Notice #2389, the error may occur during "memory intensive" activity such

as ANSYS usage.



TYPICAL GUI PATH(S):     N/A



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev.  5.0A                         Release 5.3



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Turn off bidirectional memory by inserting the following command

before the ANSYS command line.



/etc/cpu -m bdmoff



Specifically, edit the /ansys52/bin/ansys52 script, and make the

following change:



Replace:  $ANSYS52_DIR/bin/ansys.e52 $*



With:     /etc/cpu -m bdmoff $ANSYS52_DIR/bin/ansys.e52 $*



COMMENTS:



     According to Cray Research, the likelihood of an error or an abort

to occur correlates with increased system load and memory activity.

Please see Cray Research Field Notice #2389 for a detailed description.

Cray Research Field Notices are available to all Cray customers who have

access to the CRInform system.  Field Notice #2389 can also be viewed

online at the following URL:



     http://crinform.cray.com/fn/field_notices/fn2389



To date, ANSYS, Inc. has not experienced or had reported to us a case of

incorrect results from this error.



AUTHOR/CORRECTOR:                       DATE: August 13, 1997

                    Lou Muccioli



REVIEWED BY QA:                         DATE: August 13, 1997

                    William J. Bryan



APPROVAL:                               DATE: August 13, 1997

                    John A. Swanson



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-36



KEYWORDS:      SOLID87        PCG            XG



DESCRIPTION OF ERROR:



          When the preconditioned or Jacobi Conjugate Gradient solver

[EQSLV, PCG or EQSLV,JCG] is used with SOLID87, the 3-D 10-Node

Tetrahedral Thermal Solid element, automatic time-stepping based on

response eigenvalues is not invoked, which can cause larger time steps

than necessary to accurately capture transient thermal response.



TYPICAL GUI PATH(S):



Preprocessor>Element Type>Add/Edit/Delete[Add]Thermal Solid[Tet 10 node

87] Solution>New Analysis>Transient

Solution>Analysis Options>Solution Method[Full]>Equation Solver>[Jacobi

     Conj Grad/Precondition CG/Iter auto select]

Solution>Load Step Opts - Time/Frequency>Time & Time Step>Automatic Time

     Stepping



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Release 5.3                        Release 5.4

ANSYS/Thermal Release 5.3          ANSYS/Thermal Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Use the frontal, incomplete Cholesky Conjugate Gradient or JCG out-

of-core solver [EQSLV,FRONT/ICCG/JCGOUT], or use other element types

(SOLID70 or SOLID90) instead.



COMMENTS:



AUTHOR/CORRECTOR:                            DATE: August 13, 1997

                    Subhasish Roy Choudhury



REVIEWED BY QA:                              DATE: August 13, 1997

                    William J. Bryan



APPROVAL:                                    DATE: August 13, 1997

                    John A. Swanson



* Unless noted otherwise.  this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-37



KEYWORDS: BIRTH AND DEATH   ELEMENT THICKNESS  NLGEOM  LARGE

DEFORMATION



DESCRIPTION OF ERROR:



     If an element that is dead (EKILL command) undergoes significant

deformation (greater than 5% strain) with large deformation turned on

(NLGEOM, ON command) and is then made alive (EALIVE command), it is

erroneously born with an updated thickness rather than its original

thickness.



     Elements which are affected include SHELL43, SHELL91, SHELL93 as

well as the 2-D solids when used with plane stress:



     PLANE2    KEYOPT(3)=0 or 3

     PLANE13   KEYOPT(3)=0

     PLANE42   KEYOPT(3)=0 or 3

     PLANE82   KEYOPT(3)=0 or 3



TYPICAL GUI PATHS:



Main Menu>Solution>Other>Kill Elements



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.0                           Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     If thickness change is not important, use SHELL143 or SHELL63.



COMMENTS:



AUTHOR/CORRECTOR:                       DATE: August 18, 1997

                    David L. Conover



REVIEWED BY QA:                         DATE: August 18, 1997

                    William J. Bryan



APPROVAL:                               DATE: August 18, 1997

                    John A. Swanson



* Unless noted otherwise.  this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-38



KEYWORDS: COUPLING  NDELE     xCLEAR    SUPERELEMENTS  P-METHOD



DESCRIPTION OF ERROR:



          If coupling is defined (CP command) and any of the nodes in the

coupled set are deleted (NDEL or xCLEAR commands, where x=V, A, L, or K)

and the nodes are subsequently recreated, then the following analyses

which rely on the node/coupling cross-referencing are incorrect:



1.   Nonlinear superelement use pass (SE command) with a non-zero imposed

     displacement (D command) on one of the superelement nodes that is

     part of the coupled set.



2.   P-method analysis using either of the 3-D elements SOLID147 or

     SOLID148.



TYPICAL GUI PATH(S):



Main Menu>Preprocessor>Coupling/Ceqn

Main Menu>Preprocessor>Delete>Nodes

Main Menu>Preprocessor>Clear



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.0                           Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Delete and re-define the coupled sets after the nodes are recreated.



COMMENTS:



     In the corrected release, coupled sets and constraint equations

which contain a node that is deleted will also be deleted.



AUTHOR/CORRECTOR:                       DATE: August 18, 1997

                    David L. Conover



REVIEWED BY QA:                         DATE: August 18, 1997

                    William J. Bryan



APPROVAL:                               DATE: August 18, 1997

                    John A. Swanson



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-39



KEYWORDS:      NONLINEAR ANALYSIS       NEQIT,1



DESCRIPTION OF ERROR:



     For a nonlinear analysis performed with the maximum number of

equilibrium set to 1 (NEQIT,1), neither is an ERROR/WARNING message

produced nor is the run terminated.  The results for such a solution as

well as any subsequent loadstep will likely be incorrect since the ESAV

file is not updated for an unconverged solution.



TYPICAL GUI PATH(S):



Main Menu>Solution>Nonlinear>Equilibrium Iter

Main Menu>Solution>Nonlinear>Criteria to Stop



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.0                           Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Specify more than 1 for the maximum number of equilibrium iterations

(NEQIT command) for nonlinear analysis.



COMMENTS:



     The use of a small number equilibrium iterations for a nonlinear

analysis is a non-typical use of the program and is not recommended since

it will generally produce an unconverged solution.



AUTHOR/CORRECTOR:                            DATE: September 22, 1997

                    Yong-Cheng Liu



REVIEWED BY QA:                              DATE: September 22, 1997

                    William J. Bryan



APPROVAL:                                    DATE: September 22, 1997

                    David L.  Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

see the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the

reverse.side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-40



KEYWORDS:           SELECT         ALLSEL,BELOW



DESCRIPTION OF ERROR:



     ALLSEL,BELOW, entity (where entity = ALL [default], VOLU, AREA, LINE

or KP) can select nodes or elements that are not appropriate in the

following cases:



1.  An element that is not associated with the selected solid model

entities is erroneously selected if all of its nodes are associated with

the selected solid model entities.  Typical examples are elements in

"holes" or elements (non-midside node triangle or tetrahedron) located in

corners that are formed by one or more selected bordering meshed

entities.



2.  Nodes that are associated with applicable solid model entities but

are not connected to any element associated with an applicable entity are

erroneously selected.  For example, ALLSEL,BELOW, AREA for an area, not

meshed with area elements, which is part of a meshed volume, will

erroneously select the nodes associated with the area.



     Attributes or loads subsequently applied to selected sets of nodes

or elements can cause unintended results.



TYPICAL GUI PATH(S):



Utility menu>Select>Entities



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.0                           Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Check the set of selected nodes and elements produced by the above

noted cases.  Use the node and element select capabilities (NSEL and

ESEL) to remove any erroneously selected nodes or elements from the

selected set.



COMMENTS:



AUTHOR/CORRECTOR:                       DATE: September 22, 1997

                    Ken Podlaszewski



REVIEWED BY QA:                         DATE: September 22, 1997

                    William J. Bryan



APPROVAL:                               DATE: September 22, 1997

                    David L. Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

see the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-41



KEYWORDS:                THERMAL             FLUID



DESCRIPTION OF ERROR:



     Flotran analyses of thermal-fluid problems at high Peclet numbers

may contain energy imbalances and incorrect temperatures.  Problems

without flow are unaffected.



     The exact range of the Peclet numbers affected is problem dependent.

The user can determine whether the problem exists by examining

information in the jobname.pfl file and performing a heat balance.  The

procedure for performing a heat balance is outlined in Chapter 5 of the

Flotran Analysis Guide.



TYPICAL GUI PATH(S): N/A



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.1                           Release 5.5



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     The user should verify the heat balance in cases with heat

generation by looking at the difference between energy in and energy out

and comparing it to the volumetric heat generation term (if applicable).

In some cases, users specify temperatures instead of heat sources.  In

such cases, the energy flow into the system is from Wall Heat Transfer.

This is checked against the energy flow in/out.



COMMENTS:



AUTHOR/CORRECTOR:                       DATE: September 15, 1997

                    Rich Lange



REVIEWED BY QA:                         DATE: September 15, 1997

                    William J. Bryan



APPROVAL:                               DATE: September 15, 1997

                    Dave Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-42



KEYWORDS:           SPECTRUM       PSD            SPOPT,PSD



DESCRIPTION OF ERROR:



     A PSD spectrum analysis [SPOPT,PSD] with closely spaced PSD input

values (less than 0.1) produces incorrect displacement, velocity and

acceleration responses.  The magnitude of the error is dependent on model

frequency.



TYPICAL GUI PATH(S):



Main Menu>Solution>Analysis Option>Spectrum>PSD Analysis



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Release 5.3                        Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



COMMENTS:



AUTHOR/CORRECTOR:                       DATE: September 15, 1997

                    Mu-Tsang Chen



REVIEWED BY QA:                         DATE: September 15, 1997

                    William J. Bryan



APPROVAL:                               DATE: September 15, 1997

                    Dave Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-43



KEYWORDS: EMAG      CIRCUIT   CIRCU124  ELEM124   RESISTANCE



DESCRIPTION OF ERROR:



     A zero (or unspecified) resistance value (first real constant) for

CIRCU124 with KEYOPT(1)=0, is erroneously interpreted as 1 Ohm, leading

to incorrect solutions.



TYPICAL GUI PATH(S):



Preprocessor>Element Type>Add/Edit/Delete

Preprocessor>Real Constants>Add



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Release 5.3                        Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Use a small value (such as 1.0e-6 Ohm) rather than zero for a

resistor with a small resistance.



COMMENTS:



AUTHOR/CORRECTOR:                       DATE: October 14, 1997

                    Jian-She Wang



REVIEWED BY QA:                         DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                               DATE: October 14, 1997

                    David L. Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-44



KEYWORDS:           SELECT         ELEMENT        ESEL



DESCRIPTION OF ERROR:



Selecting or unselecting elements by element surface load (ESEL with

Item=SFE) will fail to select (or unselect) any element within the select

criteria whose TYPE number does not equal its MAT number.



     For example, if an element was of type 6 and referenced material 3,

this element will not be selected even if it has an applied element

surface load that is within the specified select range.  However, if that

element was of type 6 and the referenced material number was also 6, the

element would be selected.



TYPICAL GUI PATH(S):



Utility Menu>Select>Entities



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Release 5.3                        Release 5.5



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



COMMENTS:



AUTHOR/CORRECTOR:                            DATE: October 14, 1997

                    Christopher W. Aiken



REVIEWED BY QA:                              DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                                    DATE: October 14, 1997

                    David L.  Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-45



KEYWORDS:      *AFUN,DEG GUI  PICKING   ANGULAR FUNCTION



DESCRIPTION OF ERROR:



     In the GUI, when creating nodes or keypoints on the working plane by

picking (N,,P or K,,P), if degree units have been specified for angular

functions (*AFUN,DEG), then any angular functions (.e.g. SIN, COS, etc.)

entered directly in the input window to define a coordinate will

erroneously use radian units rather than degree units.



TYPICAL GUI PATH(S):



Utility Menu>Parameters>Angular Units

Preprocessor/Create/Nodes/On Working Plane+

Preprocessor/Create/Keypoints/On Working Plane+



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.1                           Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Use radian units for angular functions (e.g. SIN, COS, etc.) in such

cases.  For cases where degree units are required for input for a

coordinate (cylindrical or spherical coordinate system) use the required

function to define a parameter, then enter the parameter name in the

input window.



COMMENTS:



     The affected angular functions are SIN, COS, TAN, ASIN, ACOS, ATAN,

ATAN2, ANGLEK and ANGLEN.



AUTHOR/CORRECTOR:                       DATE: October 14, 1997

                    Paul Tallon



REVIEWED BY QA:                         DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                               DATE: October 14, 1997

                    David L. Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

see the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers,



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-46



KEYWORDS:           CFD            FLOTRAN        YPLU



DESCRIPTION OF ERROR:



     In a FLOTRAN analysis, reported values of turbulence model parameter

YPLU are incorrect for cases where near-wall nodes have been placed

extremely close to the wall, in the laminar sublayer of the turbulent

boundary layer.  Normally for best results, near-wall nodes should be

located outside the laminar sublayer, in the range of 30 < YPLU < 1000.

This error only affects reported YPLU values in POST1.



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.1                           Release 5.4

ANSYS/FLOTRAN Rev. 5.1



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



COMMENTS:



AUTHOR/CORRECTOR:                       DATE: October 14, 1997

                    Mark Troscinski



REVIEWED BY QA:                         DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                               DATE: October 14, 1997

                    David L. Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-47



KEYWORDS:           CSWPLANE       *GET      CDWRITE   ANGLES



DESCRIPTION OF ERROR:



     Any local coordinate system defined by the CSWPLA command has the

following errors:



1.   Values retrieved by the *GET or *VGET commands for any orientation

     angles of the coordinate system will always be zero.



2.   CDWRITE does not write the correct orientation angles onto File.CDB.



TYPICAL GUI PATH(S):



Utility Menu>WorkPlane>Local Coordinate Systems>Create Local CS



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.0                           Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Use the LOCAL or CLOCAL command to define the coordinate system

instead.



COMMENTS:



1.   The CSLIST command will indicate the erroneous orientation of a

     coordinate system restored from a File.CDB.



2.   Any nodes that were rotated into the coordinate system in question

     prior to the CDWRITE will have correct rotations on the CDWRITE file

     (File.CDB).



3.   A similar Class3 Error Report (#93-92) was issued for the CS and

     CSKP commands.



AUTHOR/CORRECTOR:                       DATE: October 14, 1997

                    David L. Conover



REVIEWED BY QA:                         DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                               DATE: October 14, 1997

                    Mark C. Imgrund



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-48



KEYWORDS:           SHELL181                 HYPERELASTIC



DESCRIPTION OF ERROR:



     Using the five (5) parameter Mooney-Rivlin model (TB,HYPER) with

SHELL181, the finite strain shell element, produces incorrect results;

the code wrongly assumes the 3rd, 4th and 5th parameters to be equal to

zero.  Both 2 and 9 parameter models produce correct results.



TYPICAL GUI PATH(S):



Main Menu>Preprocessor>Element Type>Add/Edit/Delete [Add][Shell][Hyper 4

node 181]



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Release 5.3                        Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     An equivalent 5 parameter input would be to specify a 9 parameter

model with at least one of the parameters 6 through 9 being a very small

number.  This will result in the 9 parameter model being invoked.  The

specification of a nonzero parameter (6 through 9) should be such that it

does not adversely affect the results of the 5 parameter model.  This

workaround is very limited and we do not recommend its use without

sufficient verification against established results.



COMMENTS:



AUTHOR/CORRECTOR:                            DATE: October 14, 1997

                    Sekar M. Govindarajan



REVIEWED BY QA:                              DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                                    DATE: October 14, 1997

                    David L. Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                          ERROR NO: 97-49



KEYWORDS: POST1     PLESOL    SHELL          /GRAPHICS,FULL

               SHELL  ELEMENTS43, 63, 91, 93, 99, 143, 150, 162, 163, 181



DESCRIPTION OF ERROR:



     In POST1, the PLESOL command will display incorrect stress, strain,

gradient and flux results for she]] elements (43, 63, 91, 93, 99, 143,

150, 162, 163, 181) when the MID or BOT location is specified by the

SHELL command and full graphics displays (/GRAPHICS,FULL) are requested.



TYPICAL GUI PATH(S):



Main Menu>General Postproc>Plot Results>Element Solu

Utility Menu>Plot>ResultsElement Solu



FIRST INCORRECT VERSION(S):*       CORRECTED IN:



Release 5.4                        Release 5.5



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Use the PLNSOL command or use PowerGraphics (/GRAPHICS,POWER) to

display the results.



COMMENTS:



     The results at she]] location TOP display correctly.  TOP is the

default location if no she]] location is specified.



AUTHOR/CORRECTOR:                       DATE: October 14, 1997

                    Herb Mroz



REVIEWED BY QA:                         DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                               DATE: October 14, 1997

                    David L. Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                       ERROR NO: 97-02 R1



KEYWORDS:           MAGNETICS      SENERGY   MACRO



DESCRIPTION OF ERROR:



     Stored magnetic energy calculated with the SENERGY command macro

will be incorrect for the following cases:



   1.     Permanent magnet elements with an assigned element coordinate

          system (ESYS command) that is other than the global Cartesian

          system.



or 2.     Three dimensional problems using the Magnetic Scalar Potential

          formulation (element types SOLID96, SOLID5, SOLID98) with

          current sources (element type SOURC36 or currents from coupled-

          field element types SOLID5, LINK68, SOLID69 or SOLID98).

          Energy from the current source (H-S field) is neglected.



or 3.     Nonlinear permeable regions (defined by a B-H curve) [TB

          command].



TYPICAL GUI PATH(S):



SENERGY:  Main Menu > General PostProc > Elec & mag Calc

ESYS:     Main Menu > Preprocessor > Attributes > Default Attribs



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.2                           Release 5.4

ANSYS/EMAG Rev. 5.2



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     For Item 1: Define permanent magnet elements with the default global

Cartesian element coordinate system.  Revise the coercive force

components (MP command, MGXX, MGYY, MGZZ material properties) to align

with the global Cartesian coordinate system.



MP: Main Menu > Preprocessor > Material Props > Isotropic



COMMENTS:



     The integration limits for permanent magnet energy will be changed

(see Theoretical Manual, equation 19.6-18).  The zero energy level is

presently defined at a value of B = 0.  This will be changed in the

corrected version to a zero energy level defined at B =Br, where Br is

the residual induction of the permanent magnet.  The new integration

limit level is more in line with industry standards.  In addition,

absolute signs on the energy and co-energy calculations will be removed

(see equations 19.6-18, 19.6-19).



     ANSYS users may obtain a corrected version of the macro for use in

ANSYS 5.3 by installing ANSYS Service Pack No. 2.  For information

obtaining an ANSYS Service Pack, review the ANSYS HomePage under Service

Support (http://www.ansys.com/Enhancement).



AUTHOR/CORRECTOR:                       DATE: September 15, 1997

                    Dale Ostergaard



REVIEWED BY QA:                         DATE: September 15, 1997

                    William J. Bryan



APPROVAL:                               DATE: September 15, 1997

                    Dave Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                       ERROR NO: 96-50 R1



KEYWORDS:      SOLID92   PLANE2    SOLID87        CURVED EDGES

DESCRIPTION OF ERROR:



     [Redline: SOLID92 and PLANE2 will produce erroneously high stress

concentrations for elements with curved edges and geometrically linear

analysis and SOLID87 may produce erroneous high fluxes across element

faces whose edges are curved if:]



     [Redline: 1.   curved edge lengths are of the order 1.0e-3 or less.]



[Redline: or 2.     The mid node on the curved edge is located away from

                    the mid point location of the straight line joining

                    the end nodes of the curved edge by a distance of

                    1.0e-5 or less times the length of the straight

                    line.]



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Release 5.3                        Release 5.4

Component Products Release 5.3     Component Products Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



1.   Set the undocumented KEYOPT(8)=l for SOLID92, PLANE2, or SOLID87

     before solution.  This will force an alternative form of element

     formulation producing the correct stresses and fluxes.



2.   Use the straight-sided meshing option.



COMMENTS:



1.   Straight edges give correct results.



2.   This error over predicts the stress or flux.



3.   Primary solution, i.e. the displacements and temperatures are

     correct.



4.   Unreasonably high stress concentrations or fluxes are seen when this

     error occurs.



AUTHOR/CORRECTOR:                       DATE: September 15, 1997

                    Pakal Rahulkumar



REVIEWED BY QA:                         DATE: September 15, 1997

                    William J. Bryan



APPROVAL:                               DATE: September 15, 1997

                    Dave Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



               ANSYS [Registered copy] CLASS3 ERROR REPORT



                                                       ERROR NO: 96-38 R1



KEYWORDS:      SOLID MODELING      BOOLEAN   SUBTRACT  ASBL



DESCRIPTION OF ERROR:



     The "SEPO" field of the solid modeling boolean command "ASBL" does

not always produce separate areas.  It may produce areas with separate

lines which share common keypoints.



     In most cases this error is obvious.  However, there may be rare

instances where the error could lead to unanticipated results if

validation of boundary conditions and loads is bypassed before solution

by the user.



FIRST INCORRECT VERSION(S):*       CORRECTED IN:*



Rev. 5.1                           Release 5.4

Component Products Rev. 5.1        Component Products Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     In Release 5.3 or later, generate separate areas from unseparated

areas by using the "AGEN" command after the "ASBL" command.



COMMENTS:



[Redline: ** Starting in Revision 5.2. a warning is issued for any use o

the SEPO field in the ASBL command stating that separate coincident

keypoints may not be produced for areas divided by curves.  At 5.4 the

SEPO field is no longer documented and has been removed from the ASBL

command in GUI.  Any use of the undocumented SEPO field on the ASBL

command will produce the above noted warning.]



AUTHOR/CORRECTOR:                            DATE: October 14, 1997

                    Ken Podlaszewski



REVIEWED BY QA:                              DATE: October 14, 1997

                    William J. Bryan



APPROVAL:                                    DATE: October 14, 1997

                    David L. Conover



* Unless noted otherwise, this report applies to all ANSYS family

products which contain the described feature in the indicated Release(s).

See the reverse side for details regarding product applicability.



Unless noted otherwise, this error report also applies to all releases

after the first incorrect one and prior to the corrected release.  All

releases after "corrected in" are corrected.  Manual corrections are

included in on-line documentation as appropriate.  Please see the reverse

side of this sheet for additional information on ANSYS release

identifiers.



                    ANSYS [Registered copy] QA NOTICE



                                                       NOTICE NO: QA97-02



SUBJECT:       MEMORY         LEAK      PC   NT   95



DESCRIPTION:



     Due to an error in the Microsoft Fortran compiler used for the ANSYS

versions and releases noted below, each time a Fortran formatted read or

write is performed by the ANSYS program a small amount of memory is made

unusable.  This unusable memory accumulates and is not freed up until the

ANSYS program is exited.  This memory leak does not affect analysis

results and is not noticeable in most cases.  However in some analyses,

the small memory leaks can accumulate to a point where system problems

occur due to a lack of available free memory.  For cases where

accumulated memory losses cause problems, symptoms may include:



     -    the system complains that it is running out of resources and

          suggests the user shut down some applications

     -    ANSYS appears to hang, or aborts

     -    other running applications may be affected



     This compiler bug only manifests itself when a very large amount of

ASCII reads/writes are being performed by the ANSYS program.  Reading or

writing of binary files (db, emat, rst, etc.) does not appear to produce

leaks.  For most analyses, the number of ASCII reads or writes is not

significant enough to make the memory problem noticeable.  However, the

looping capability provided in the ANSYS APDL macro language can cause a

large number of applicable file reads to occur and may result in a

significant amount of memory becoming unusable.



AFFECTED VERSIONS:  ANSYS Revisions 5.2 - 5.4 for Windows 95

                    ANSYS Releases 5.3 - 5.4 for Windows NT

                    (Note: ANSYS for DEC Alpha is NOT affected)



SUGGESTED USER ACTION:



     For cases where the amount of memory made unusable causes a problem,

the following practices may reduce the amount of memory affected:



     -    In APDL macros, replace all *GO,:label and

          *IF,var,oper,var,place,num type branching with *DO ... *ENDDO

          loops

     -    run the analysis using several separate ANSYS sessions (i.e.

          run pre-processing, solution load steps and post-processing

          each in a separate ANSYS session)

     -    exit and restart ANSYS between CDWRITEs and CDREADs of very

          large models



Page 2 of 2                  ANSYS QA NOTICE



                                                  NOTICE NO: QA97-02

SUGGESTED USER ACTION: (continued)



     -    after IGES import of very large models; save, exit, restart

          ANSYS, and resume the model from the binary .db file



COMMENTS:



     There is currently no information available as to when a correction

for this compiler error will be available.



AUTHOR:                                 DATE: August 18, 1997

               Rick Reynolds



REVIEWED BY QA:                         DATE: August 18, 1997

               William J. Bryan



APPROVAL:                               DATE: August 18, 1997

               John A. Swanson



                                                                 SCB97-02

                   ANSYS Support Coordinator Bulletin



This Support Coordinator Bulletin contains information pertaining to

ANSYS Release 5.4.  It provides information about known, non-Class3

errors in the ANSYS program and information regarding workarounds.



SYSTEM



KEYWORDS: IBM RS590      RUBY      or   GTX1000 GRAPHICS BOARD



DESCRIPTION: On the IBM RS590 machine running under AIX 4.1.4 with the

RUBY or GTX1000 Graphics Board installed, dynamic rotations in X11 mode

with the triad present will leave spurious dots on the screen.



AFFECTED VERSIONS: Release 5.3, Release 5.4 and possibly Revisions 5.1 &

5.2



WORKAROUND: Currently none.  IBM is looking into the problem and when

they have developed a patch or fix we will place this information on our

web site and make the patch available to the affected users.



KEYWORDS:      HP   IBM R/S6000         ANS_ADMIN



DESCRIPTION: If you are uninstalling the ANSYS 5.4 product on the HIP or

IBM R/S6000 platform and using the GUI version of ANS_ADMIN, the process

may hang.



AFFECTED VERSIONS: Release 5.4



WORKAROUND: If you encounter this situation, you may kill the ANS-ADMIN

processes from another window and continue.  It is recommended that you

use the non-GUI version of ANS-ADMIN to uninstall the product(s).



KEYWORDS: IBM  R/S6000   AIX 4.1.5   LARGE MEMORY     INSTALLATION GUIDES



DESCRIPTION: The 2 PTFs for the AIX 4.1.5 operating system listed on page

1-14 of the ANSYS 5.4 Installation Guide are not sufficient to allow a

large memory request (e.g., -m of 1800 or more).



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: It is required that AIX 4.1.5 GOLD be installed.  An upgrade

to AIX 4.1.5 via the maintenance package and then application of the

latest (September 1997) fixes will upgrade the O.S. to the 4.1.5.X level

but will not correct the problem.  You will not get the native AIX 4.1.5

software enhancements nor will you get native AIX 4.1.5 hardware support.

The error that existed for memory allocation in AIX 4.1.4 was corrected

as a native AIX 4.1.5 software enhancement.  Only by installing the AIX

4.1.5 OS from the install media (migrate, preservation or complete) will

this Hardware/Software support get installed and correct the swap space

allocation error.



SCB97-02                                          Page 1 of 8



KEYWORDS: SGI R8000/R10000 w/MULTIPLE PROCESSORS     BLOCK LANCZOS

SOLVER

               SPARSE SOLVER



DESCRIPTION: On the SGI R8000/R10000 machine running a 64 bit operating

system, a modal analysis using the Block Lanczos or Sparse solver will

use the maximum number of processors that are available even though

NPROC=1 (/config,nproc, 1) or NUM_PROC=1 is set in the config.ans file.



AFFECTED VERSIONS: Release 5.3 Release 5.4



WORKAROUND: Set the system environment variable "MP_SET_NUMTHREADS" to a

value of one before running the analysis.



KEYWORDS:      PC        WIN95          NT4.0



DESCRIPTION: The side menus in the GUI may appear to be slow on certain

PC platforms.



AFFECTED VERSIONS: Release 5.4



WORKAROUND: None



KEYWORDS:      NT3.51         NT4.0          MATERIAL LIBRARIES



DESCRIPTION: The material library shipped with ANSYS 5.4 has an extension

on the files that ANSYS will not recognize when a material is requested

from the library



AFFECTED VERSIONS: Release 5.4



WORKAROUND: Globally change the material library file extensions to 3

characters or less.



GRAPHICS / GUI



KEYWORDS:      GUI       TSHAP     CONTACT ELEMENTS



DESCRIPTION: When contact elements are present and TSHAP is set to the

CIRC option, the plot within the GUI will be off center and to the right

of the screen



AFFECTED VERSIONS: Release 5.4



WORKAROUND: Use the PAN - ZOOM - ROTATE menu to position the model on the

screen.



SCB97-02                                               Page 2 of 8



CDWRITE / IGES



KEYWORDS:      SOLID MODELING      CDWRITE   CDREAD    IGES



DESCRIPTION: CDWRITE with the options; ALL, COMB or SOLID uses IGES

transfer to write out modeling information.  CDREAD with the same options

uses the same IGES transfer.  Since the IGES transfer does not Guarantee

topological consistency, files may be produced that cannot be read back

into ANSYS when the above fields are used.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: Use the SAVE and RESUME commands to save data, or use the DB

option with the CDWRITE/CDREAD command.



KEYWORDS:      SOLID MODELING           IGES



DESCRIPTION: There may be IGES files created by the IGESOUT command in

ANSYS that cannot be read back into ANSYS with the IGESIN command.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: Use the SAVE and RESUME commands to save data, or use the DB

option with the CDWRITE/CDREAD command.



KEYWORDS:      CDWRITE             CDREAD



DESCRIPTION: A file created with CDWRITE in the 5.4 Beta release will not

read in the ANSYS 5.4 released version.



AFFECTED VERSIONS: Release 5.4



WORKAROUND: Issuing a SAVE at BETA 5.4 and a RESUME at 5.4 released will

allow transfer of data between the two releases.



ELEMENTS



KEYWORDS:      SHELL99        NONLINEAR BUCKLING



DESCRIPTION: In a nonlinear buckling problem SHELL99 may not converge.

SHELL99 can be used with most nonlinear problems (NLGEOM,ON) but is

unpredictable in nonlinear buckling problems.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: Use SHELL91 for nonlinear buckling problems..



SCB97-02                                               Page 3 of 8



KEYWORDS:      CIRCU124       COUPLING COEFFICENT         MUTUAL INDUCTOR



DESCRIPTION: When using a coupling coefficient (k) of 1 for a CIRCU124

element defined as a mutual inductor will produce huge pivot ratios and

apparently bad results.



AFFECTED VERSIONS: Release 5.3



WORKAROUND: Use a value of .999 for 1.0.  In Release 5.4, an input value

of k greater than or equal to 1.0 is redefined as having a value of .999.



KEYWORDS:      BEAM4     PIPE16    MODAL     GYROSCOPIC     MODOPT



DESCRIPTION: When running a modal analysis using a BEAM4 / PIPE 16 model

with the gyroscopic moment term turned on, (nonzero SPIN velocity input

through real constant 11 in BEAM4, or Real Constant 13 in PIPE 16) the

eigenvalue frequencies computed by the damped eigensolver may be

sensitive to the value of the 'shift' used, e.g, MODOPT,DAMP,10,shift.

This is due to the fact that the element matrix coefficients may become

poorly conditioned, the ratio of maximum to minimum coefficient becoming

too large.  This is especially true when the SPIN velocity is large.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: The user can verify that his model is not becoming affected

by this by verifying that the frequencies remain unchanged with two

different 'shift' values.



KEYWORDS:      CONTA171  CONTA172  CONTA173  CONTA174



DESCRIPTION: When using CONTA171, CONTA172, CONTA173 or CONTA174 elements

with an uncompressed element list, incorrect or erroneous results may be

produced.  An uncompressed element list is due from elements being

deleted and/or from remeshing which can produce unused element numbers in

the list of elements.



AFFECTED VERSIONS: Release 5.4



WORKAROUND: Issue a NUMCMP,ELEM prior to solution.  This will compress

the element list and correct the problem.



KEYWORDS: CONTA171 CONTA172 CONTA173 CONTA174     PARALELL/MULTIPLE

                                                  PROCESSORS



DESCRIPTION: If running on a machine with multiple processors active

(setting of num_proc greater than 2) and using the contact elements

CONTA171, CONTA172, CONTA173, or CONTA174, erroneous results may be

produced.  An uncompressed element list is due from elements being

deleted and/or from remeshing which can produce unused element numbers in

the list of elements.



AFFECTED VERSIONS: Release 5.4



WORKAROUND: Set the number of processors to 1 (num_proc = 1).



SCB97-02                                               Page 4 of 8



SOLID MODELING / MESHING



KEYWORDS:      SOLID MODELING      BOOLEAN        AFILLT



DESCRIPTION: There are occasions where the AFILLT command will not cut

the areas properly when sharing a common line and using a small radius.



AFFECTED VERSIONS: Revision 5.2, Release 5.3, Release 5.4



WORKAROUND: It is possible in some cases to define a line and drag it

along the path desired in order to form a fillet.



KEYWORDS:      ELEMENT SHAPE CHECKING   ESEL      CHECK



DESCRIPTION: The command "CHECK,ESEL,WARN" should select all elements

that produce shape warnings or errors.  Quadrilateral elements

degenerated into triangles, or brick elements degenerated into wedges,

pyramids, or tetrahedra, produce warnings about the degeneracies.

However, only the element with the highest element number with those

degeneracies will be selected by CHECK,ESEL,WARN in the absence of other

flaws in those element(s).



This error also affects the 5.4 GUI paths Preprocessor>-Meshing- Plot Bad

Elms and Sel Bad Elems.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: Treat the selection or plotting of 1 or 2 degenerate elements

as notification that the model could contain an arbitrary number of such

elements.



KEYWORDS:      SOLID MODELING      xREFINE        VIMP



DESCRIPTION: The xREFINE family of commands (KREF, LREF, AREF, NREF,

EREF) and the VIMP command have been shown to store an incorrect value in

the database if any of the meshed lines has only one element division on

it.  This erroneous value can potentially impact solid modeling or

meshing operations further in the analysis.  This value may be incorrect

when the following conditions are present:



     1.   When using the xREFINE commands on an area or tet mesh of

          linear (non mid-side noded) elements and the mesh on any of the

          lines on the areas or volumes affected by the refinement has

          only one element division on it.



or   2.   When using the VIMP command on linear tet elements, with the

          CHGBND argument set to 1 (i.e., boundary modification is

          allowed) and any line on the volume has only one element

          division on it.  Note that the problem will not occur if the

          line with the one element division is attached to another

          meshed volume, or if the line has been assigned the 1 division

          by the LESIZE command.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND:



For the REFINE or VIMP commands;

     -    use quadratic elements, or

     -    on areas / volumes specify more than 1 division on all of the

          lines.



For the VIMP command:

     -    set the CHGBND field to a value of 0 (do not allow boundary

          modification), or

     -    use the LESIZE command to specify 1 division instead of the

          ESIZE, SMRTSIZE or other sizing commands to automatically set

          this value to 1.



SCB97-02                                               Page 5 of 8



SOLVER / SOLUTION



KEYWORDS:      NONLINEAR           BUCKLING       STRESS STIFFENING



DESCRIPTION: Prior to Release 5.3, ANSYS would bisect and eventually

terminate when a negative main diagonal was encountered.  In beam and

shell models, with stress stiffening turned on (SSTIF,ON), this was

frequently an indication that the buckling limit had been exceeded.

Beginning with Release 5.3, ANSYS solves for the negative main diagonal

without bisecting due to the negative main diagonal.  Instead ANSYS gives

a WARNING message that small equation pivot terms have been detected by

the solver.



As a result of this new functionality, if compressive loads are applied

quickly and produce negative stiffness values for the lateral degrees of

freedom the solution will appear to skip over the instability points in

loading.  The attained solution may follow a different post-buckling path

than expected.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: If you are interested in post-buckling behavior, use arc-

length (ARCLEN,ON) in addition to stress-stiffening (SSTIF,ON) and large

deflection (NLGEOM,ON).  If the arc-length method does not support your

load type, then small load steps must be used without auto-time stepping

(AUTOTS,OFF).  Also, the best form of perturbation for this type of

problem is a small geometric imperfection and not a lateral force.  If

you are interested in obtaining buckling values and mode shapes then

eigenvalue buckling may be used.



KEYWORDS:                     PCG THERMAL EXPANSION



DESCRIPTION: Convergence in a PCG solution (EQSLV,PCG) is performed by

checking if the force computed from this iteration's displacements

matches the applied loads within the tolerance:



     [symbols omitted]



where [symbol omitted] is the convergence tolerance (EQSLV,PCG,toler) and

[symbols omitted] is the norm of the applied force.



If the norm of the applied load [Symbols omitted] is large, then the

stress or reaction error will also be large.  Large norms occur when a

body (e.g. gravity or thermal) loads are applied.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: When the load is large, use smaller tolerance in PCG in order

to have less solution errors of reaction or stress or use an alternative

solver.



KEYWORDS:      PCG SOLVER          MODAL          POWERDYNAMICS



DESCRIPTION: The automatic shifting strategy used in Powerdynamics

(MODOPT,SUBSP and EQSLV,PCG) may cause the eigensolution to fail due to

"negative diagonals" encountered..



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: Use Block Lanczos or Subspace with the Frontal solver in

place of the PCG solver.



SCB97-02                                               Page 6 of 8



KEYWORDS:      PCG            NEWTON-RAPHSON           FILE.ABT



DESCRIPTION: When using the PCG solver in a nonlinear problem, there may

be cases where the file.abt will not abort the job as documented.



AFFECTED VERSIONS: Release 5.4



WORKAROUND: Use a solver other than the PCG solver.  Note that we

document that you should not use the PCG solver for difficult nonlinear

jobs.



KEYWORDS:      BLOCK LANCZOS SOLVER          EIGENVECTOR EXTRACTION



DESCRIPTION: When extracting a very large number of modes using the Block

Lanczos Solver, the extracted modes beyond a certain number will all have

0.0 displacements on the results (.rst) file.  At Release 5.3 the maximum

number of modes that can requested in a single run is 718.  At Release

5.4, the maximum number is 913.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: If you wish to extract a number of modes greater than the

known limits, you must perform two analyses.  For example, to extract

1000 modes you would first extract and expand 500 modes using the command

MODOPT,LANB,500.  For the second analysis you would issue the command

MODOPT,LANB,500,FREQB, where FREQB would be the eigenvalue of 500th mode

of the first analysis.  This would shift the frequencies of interest in

the 2nd analysis to the point that the first analysis finished extracting

frequencies.



KEYWORDS:      AUX12     RADIATION      AXISYMMETRIC   FORM FACTORS



DESCRIPTION: The form factors computed in an axisymmetric hidden

radiation procedure in AUX12 may be incorrect when the elements involved

have a very small or non-existent sight line and the mesh is coarse.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: For both hidden and non-hidden methods, the finer the mesh of

the radiating surface elements, the more accurate are the form factors.

However, when hidden method is used, it is particularly important to have

a fairly refined mesh in order to obtain the same level of accuracy in

view factor computation as the non-hidden method.  Even though increasing

number of rays used (controlled by NZONE argument of VTYPE command) helps

in accuracy, for a coarse mesh, increasing NZONE to even its maximum

limit might not yield accurate solution for the hidden method.



KEYWORDS:      PCG SOLVER          RUNSTAT



DESCRIPTION: The RUNSTAT when used with the PCG solver will produce

estimates of memory and file size that are greater than what is actually

needed for the job to run.



AFFECTED VERSIONS: Release 5.4



WORKAROUND: None



SCB97-02                                               Page 7 of 8



LS/DYNA EXPLICIT DYNAMICS



KEYWORDS:      POST PROCESSING          NUMVAR



DESCRIPTION: The default number of variables defined with the NUMVAR

command is 30 for an explicit dynamics analysis.  It is documented as

only defining 10 by default.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: N/A



KEYWORDS:      EDLOAD         EDCURVE        /MENU



DESCRIPTION: The GUI will not allow input of a 2D array for the EDCURVE

or EDLOAD command.



AFFECTED VERSIONS: Release 5.3, Release 5.4



WORKAROUND: You must use the command input window to input the required

information for the 2D array with EDCURVE or EDLOAD.



FLOTRAN



KEYWORDS:      FLUID141       FLUID142       COMPRESSIBLE FLOW



DESCRIPTION: Simulation of transient compressible, laminar, thermal

problems involving moving shock waves in an enclosed region can produce

source terms in the energy equation that lead to continued increase of

the total temperature.



AFFECTED VERSIONS: Revision 5.1, Revision 5.2, Release 5.3, Release 5.4



WORKAROUND: None



Author:                                      Date: October 21, 1997

               Michael F.  Michalski



Reviewed by QA:                              Date: October 21, 1997

               William J.  Bryan



Approval:                                    Date: October 21, 1997

               David L.  Conover



SCB97-02                                               Page 8 of 8



Attachment "ANSYS 5.3 CLASS3 ERROR SUMMARY BY REPORT NUMBER" 2 pages,

omitted.



Attachment "ANSYS 5.3 CLASS3 ERROR SUMMARY; KEYWORD SORT OF ALL

REVISION

5.3 CLASS3 ERRORS, Date of this report: 10/16/97", 6 pages, omitted.



*** END OF DOCUMENT ***



Page Last Reviewed/Updated Thursday, March 29, 2012