United States Nuclear Regulatory Commission - Protecting People and the Environment


ACCESSION #: 9611130129



                     Information & Support Services

                              P.O. Box 3707

                         Seattle, WA 98124-2207



November 4, 1996

G-1151-SJA-96-668



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

     Tenera Engineering Services

     Gibbs & Hill, Inc.

     Holtec International



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 96-42, 96-43, 96-44, 96-45,

               96-46

               ANSYS QA Notices QA96-09 and QA96-05R1

               ANSYS Support Coordinator Bulletin SCB96-01



ANSYS[Registered Trademark]



                         ANSYS, Inc.

                         201 Johnson Road         Telephone 412.746.3304

                         Houston, PA 15342-1300   Facsimile 412.746.9494



                         October 24, 1996



Dear Class3 Error Recipient:



     Enclosed you will find ANSYS Class3 Error Reports 96-42, 96-43,

96-44, 96-45 and 96-46.  Also, enclosed are ANSYS QA Notices QA96-09 and

QA96-05 R1.



     QA96-09 has been issued to alert users of SOLID62 and SOLID97 that

the normal component of the magnetic vector potential must be

discontinuous across material interfaces of differing permeability.



     QA96-05 R1 has been reissued to notify users of the full scope of

the error reported in QA96-05.  This error has been fully described in

Class3 Error Report 96-43 which is attached.



     Finally, enclosed is ANSYS Support Coordinator Bulletin SCB96-01.

It includes information pertaining to the ANSYS 5.3 Second Release and

known, non-Class3 errors in ANSYS Release 5.3.



     In the past year ANSYS has initiated the posting of all Class3

Errors and QA Notices on ANSYS's Internet Homepage whose address is

http://www.ansys.com.  Class3 Error Reports and QA Notices 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" (ANSYS is

number 1 for me).  Since 1994, ANSYS has been providing error notices via

email to all customers with maintenance who have requested electronic

mailings.  These emails are transmitted and posted within 2 working days

of final approval of Class3 Error Reports and QA Notices.  We encourage

all of our customers to take advantage of these methods for quickly

obtaining Class3 Error Reports and QA Notices.  Beginning November 1,

1996 Class3 error notification mailings to customers with maintenance

will be performed on a quarterly basis.  If you require notification

sooner please make use of our Internet or email services.  To register

for email notification of Class3 errors, simply send an email request

including your email address, company name/address and ANSYS agreement

number to bpodolek@ansys.com.  Quality Assurance Service Agreement

customers are not affected by this change.



                                   Sincerely,



                                   ANSYS, Inc.



                                   William J Bryan

                                   Quality Assurance Manager



enclosures



    ANSYS [Registered Trademark] is a registered trademark of SAS IP



                                                  ANSYS, Inc.

                                        ISO 9001       UL        A3725



                                                  REGISTERED FIRM

                                             ISO CERTIFICATION INCLUDES

                                              ALL COMMERCIAL PRODUCTS



                  ANSYS Revision Identifier Description



     ANSYS revision identifiers consist of a major revision level, a

minor revision level, a correction level, and occasionally a special

version level.  An example of how this is constructed is shown below:



Figure omitted.



     Major revision level changes indicate that new features have been

added to the program and that some level of program architecture change

and/or file structure has occurred.  Minor revision 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 revisions.  Changes to the correction level indicate that it is

primarily an error correction release.  Special version identifiers

indicate that one or more additional minor changes have been made to the

program, normally to circumvent an error.  Special versions are not

general release to all ANSYS licensees, since they typically represent

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

specific graphics devices, etc.



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

front side of this Class3 Error Report indicates the first possible

revision that could contain the correction. A major program change needed

to fix an error can dictate that the next minor or major revision will

contain the fix rather than the next correction level.  For example, when

errors were being reported while Rev. 4.3A was the latest production

version, most class3 error reports indicated that 4.3B was the "corrected

in" revision.  Others requiring significant code restructuring were

reported as fixed in 4.4. Rev. 4.3B was never released, but Rev. 4.4

contained all error corrections noted as fixed in 4.3B.



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

a general release of that revision of ANSYS will occur.  It does indicate

that the correction is known and implemented in the coding that would be

part of that general release.



                     Equivalent Product Identifiers



     The ANSYS family of products occasionally undergoes name changes

between revisions and/or changes in the functionality of derived products

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

these areas, the important product time equivalent (similar program

functionality and error content) an listed below.



     ANSYS/ED  contains all errors shown for      the full ANSYS product,

                                                  dancing at Rev. 5.0,

                                                  and beyond, unless

                                                  otherwise noted.



     PC/LINEAR is equivalent to                   WS/LINEAR at Rev.4-4A.

                                             and ANSYS/LINEAR starting at

                                                  Rev. 5.0.



     PC/THERMAL is equivalent to                  WS/THERMAL at Rev.4.4A

                                             and  ANSYS/THERMAL starting

                                                  at Rev. 5-0.



     PREPPOST contains relevant errors

     shown for                                    the full ANSYS product,

                                                  for included pre-

                                                  and postprocessing

                                                  functionality



            ANSYS [Registered Trademark] CLASS3 ERROR REPORT



                                                  ERROR NO: 96-42



KEYWORDS:      CONSTRAINT EQUATIONS     MODAL     ITERATIVE SOLVERS



DESCRIPTION OF ERROR:



     If a model contains constraint equations (CE command) at two or more

nodes of any single element, the results may be incorrect if one of the

following are true:



     1.   A modal analysis was performed (ANTYPOE, MODAL) using the block

          Lanczos method (MODOPT,LANB) or the subspace method

          (MODOPT,SUBSP) with the Frontal solver option (EQSLV,FRONT

          [default]) or the JCG solver option (EQSLV, JCG).



or   2.   An analysis was performed with the ICCG solver (EQSLV, ICCG).



or   3.   An analysis was performed with the JCG solver (EQSLV,JCG) in

          which the matrices were unsymmetric (such as in piezoelectrics,

          acoustics, and other multiphysics applications).



          Separate constraint equations typically occur when two

components are tied together using constraint equations (CEINTF cokand)

or with modal cyclic symmetry (MODCYC command).



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:



     If possible, replace the constraint equations with coupling, if the

meshes align.  Alternatively:



For  1.   Use the reduced method (MODOPT, REDUC) or the Power Dynamics

          method (MODOPT, SUBSP with EQSLV, PCG).



For 2 and 3.  Use the Frontal solver (EQSLV,FRONT).



COMMENTS:



     The correction, currently available upon request from your ASD,

fully accounts for the cross-coupling of all the constraint equations.

This may increase the wavefront by as much as a factor of 3.



     For modal analyses where there is insufficient memory to run with

this correction, an option is provided to allow it to solve with longer

run time.



     A similar correction will also be made for the block Lanczos method

and will be available at a later date to all customers through a

downloadable file from the ANSYS HomePage http://www.ansys.com/ServSupp/.



AUTHOR/CORRECTOR:                            DATE: October 22, 1996

                    John A. Swanson



REVIEWED BY QA:                              DATE: October 22, 1996

                    William J. Bryan



APPROVAL:                                    DATE: October 22, 1996

                    David Conover



            ANSYS [Registered Trademark] CLASS3 ERROR REPORT



                                                       ERROR NO: 96-43



KEYWORDS: MATRIX50       SUPERELEMENTS       COUPLED DEGREES OF FREEDOM

          NONZERO CONSTRAINTS



DESCRIPTION OF ERROR:



     Results are incorrect in a superelement (MATRIX50) use run if there

is coupling (CP, CPINTF commands) involving the superelement degrees of

freedom (DOF) and the following are true:



     1.   A nonzero constraint (D command) is applied to the coupled DOF:



and  2.   The nonzero constraint is not explicitly specified (e.g.,

          through a D command) on the superelement DOF of the coupled

          set.



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



Rev. 5.0                                     Release 5.4



SUGGESTED USER ACTION FOR RUNNING ON UNCORRECTED VERSION:



     Apply the nonzero constraint at all the nodes of the coupled set.



COMMENTS:



     This Class3 Error Report details the error originally reported in QA

Notice QA96-05, which is superseded by this Class3 Error Report.



AUTHOR/CORRECTOR:                            DATE: October 22, 1996

                    David L. Conover



REVIEWED BY QA:                              DATE: October 22, 1996

                    William J. Bryan



APPROVAL:                                    DATE: October 22, 1996



                    Mark C. Imgrund



*_/If a product name is not included in the "first incorrect versions,

the full ANSYS program is implied.  For products not listed, this error

does not apply, but see the reverse side for equivalent product

designations.



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

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

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

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

side of this sheet for additional information on ANSYS revision

identifiers.



            ANSYS [Registered Trademark] CLASS3 ERROR REPORT



                                                          ERROR NO: 96-44



KEYWORDS:      SAVE      LOADS          INITIAL CONDITIONS       /EXIT



DESCRIPTION OF ERROR:



     Initial conditions applied with the IC command are not saved with

the default specified in the exit dialog box EXIT (Utility

Menu>File>Exit>Save Geom+Loads), or with the /EXIT, MODEL or /EXIT

Command.



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:



     Select  from exit dialog box (or use /EXIT.ALL).



COMMENTS:



Note that initial conditions are saved if either the 

option (/EXIT,SOLU) or  option /EXIT.ALL) is selected

from the exit menu.  The SAVE command issued from the command line will

also save initial conditions.



AUTHOR/CORRECTOR:                       DATE:     October 22, 1996

                    Mike Normansell



REVIEWED BY QA:

                    William J. Bryan    DATE:     October 22, 1996



APPROVAL:           David Canover       DATE:     October 22, 1996



*_/If a product name is not included in the "first incorrect version",

the full ANSYS program is implied.  For products not listed, this error

does not apply, but see the reverse side for equivalent product

designations.



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

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

revisions 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 revision

identifiers.



            ANSYS [Registered Trademark] CLASS3 ERROR REPORT



                                                       ERROR NO: 96-45



KEYWORDS: FASTSOLVER     EQSLV, ITER    LSSOLVE        RAMPING



DESCRIPTION OF ERROR:



     When using the LSSOLVE command with the fastsolver option active

(EQSLV,ITER) the surface and body force loads will erroneously be ramped

from zero for each load step instead of from the previous load step

values.



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:



Use a series of SOLVE commands instead of the LSWRITE and LSSOLVE

commands.



COMMENTS:



AUTHOR/CORRECTOR:                       DATE:     October 22, 1996

                    Christopher W. Aiken



REVIEWED BY QA:                         DATE:     October 22, 1996

                    William J. Bryan



APPROVAL:                               DATE:     October 22, 1996

                    David Conover



*_/If a product name is not included in the "first incorrect version",

the full ANSYS program is implied.  For products not listed, this error

does not apply, but see the reverse side for equivalent product

designations.



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

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

revisions 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 revision

identifiers.



            ANSYS [Registered Trademark] CLASS3 ERROR REPORT



                                                  ERROR NO: 96-46



KEYWORDS: CFD       THERMAL EXPANSION   FLUID141       FLUID142



DESCRIPTION OF ERROR:



     For FLUID141 and FLUID142, the coefficient of thermal expansion

(input using the FLDA,TURB,BETA command) is ignored in any analysis.  The

print file (file.pfl) reports a value for this quantity, but incorrectly

lists the bulk modulus value (FLDA,BULK,BETA) for the fluid instead.



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:



     This only affects turbulent analysis with significant buoyancy

effects.  Even though the results appear correct, the source term in the

k-e model due to gravitational effects is zero.



AUTHOR/CORRECTOR:                       DATE: October 22, 1996

                    Deepak Ganjoo



REVIEWED BY QA:                         DATE: October 22, 1996

                    William J. Bryan



APPROVAL:                               DATE: October 22, 1996

                    David Conover



*_/If a product name is not included in the "first incorrect version",

the full ANSYS program is implied.  For products not listed, this error

does not apply, but see the reverse side for equivalent product

designations.



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

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

revisions 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 revision

identifiers.



                             ANSYS QA NOTICE



                                                  NOTICE NO: QA96-05 R1



SUBJECT: MATRIX50   SUPERELEMENTS       COUPLED DEGREES OF FREEDOM



DESCRIPTION:



     This QA Notice originally described a potential Class3 error for

which the full scope had not been determined.  The full scope of this

error has now been determined and is reported in Class3 Error Report

96-43 which supersedes the originally issued QA Notice QA96-05.



AUTHOR/CORRECTOR:                            DATE: October 22, 1996

                    Kenneth G. Podlaszewski



REVIEWED BY QA:                              DATE: October 22, 1996

                    William J. Bryan



APPROVAL:                                    DATE: October 22, 1996

                    David Conover



                             ANSYS QA NOTICE



                                                  NOTICE NO: QA96-09



SUBJECT:            ELEM62         ELEM97         MAGNETICS



DESCRIPTION:



     Our internal theoretical investigation of the three-dimensional

nodal-based magnetic vector potential formulation (used for SOLID62 and

SOLID97) has determined that the normal component of the magnetic vector

potential must be discontinuous across material interfaces of differing

permeability.  This behavior has not been published in any technical

journals that we are aware of.  The present formulation is implemented

assuming continuity of the vector potential in the whole domain.



     The formulation works well for axisymmetric type three-dimensional

models with azimuthal currents where the magnetic vector potential is

predominately tangent to the surface of material discontinuities.  It

also works well for completely homogenous problems (i.e., constant

permeability everywhere).  Two-dimensional problems using PLANE 13 or

PLANE 53 are not subject to any accuracy problems of this nature.



The formulation does not provide accurate solutions for general

three-dimensional problems containing materials of differing

permeability.  More specifically, accurate solutions will not be produced

in permeable domains where the normal component of the magnetic vector

potential is significant across the material interfaces.



AFFECTED VERSIONS: Revision 4.4A through Release 5.3



COMMENTS:



     For general static magnetic field analysis, use the scalar potential

formulations offered in elements SOLID5, SOLID96 and SOLID98.



AUTHOR:                                 DATE: October 22, 1996

               Dale Ostergaard



REVIEWED BY QA:                         DATE: October 22, 1996

               William J. Bryan



APPROVAL:                               DATE: October 22, 1996

               David Conover



                                                                 SCB96-01

                   ANSYS Support Coordinator Bulletin



This Support Coordinator bulletin consists of two sections.  The first

section contains information pertaining to the ANSYS 5.3 Second Release.

The second section provides information about known, non-Class3 errors in

the ANSYS program and information regarding workarounds.



ANSYS 5.3 Second Release



ANSYS 5.3 Second Release (identified by build number UP100396) is now

available.  This special version includes the new IGES capabilities for

the hardware systems that did not contain the capabilities in the initial

release of ANSYS 5.3.  These systems are the Digital Alpha Unix, Digital

Alpha Windows NT, Silicon Graphics R8000 and R10000.  This special

version also contains numerous corrective enhancements, some of which are

listed below by category.



PREPROCESSING



     o    Areas represented by high order NURBS surfaces now mesh

          properly.



     o    A problem with area meshes with large transitions producing

          inverted elements has been corrected.



     o    Meshing without smartsizing has been improved to reduce the

          resultant mesh coarseness.



SOLUTION



     o    Nonlinear transient thermal analyses using the Pre-conditioned

          Conjugate Gradient (PCG) solver no longer use more iterations

          than necessary.



     o    Pressure PSD spectrum analysis without a load vector scale

          factor specified (LVSCALE) no longer terminates with a

          confusing message.



     o    Modal analysis (ANTYPE, MODAL) of a model with separate

          constraint equations at two or more nodes of an element,

          performed with the block Lanczos method (MODOPT,LANB) or the

          subspace method (MODOPT,SUBSP) with the Frontal solver option

          (EQSLV,FRONT [default]) or the JCG solver option (EQSLV, JCG)

          now works correctly.  This error is reported in Class3 Error

          Report 96-42.



     o    Analysis of a model with separate constraint equations at two

          or more nodes of an element performed with the ICCG solver

          (EQSLV, ICCG) now works correctly.  This error is reported in

          Class3 Error Report 96-42.



     o    Analysis of a model with separate constraint equations at two

          or more nodes of an element performed with the JCG solver

          (EQSLV, JCG) in which the matrices are unsymmetric (such as in

          piezoelectrics, acoustics, and other multiphysics applications)

          now works correctly.  This error is reported in Class3 Error

          Report 96-42.



     o    Artificial stress concentrations are no longer produced in

          Solid 92 and Plane 2 elements with curved edges 1 X 10**-3 or

          less in length.  This error is reported in Class3 Error Report

          96-50



     o    Erroneous fluxes are no longer produced in Solid87 elements

          with curved edges 1 X 10**-3 or less in length.  This error is

          reported in Class3 Error Report 96-50



Page 1 of 5



MISCELLANEOUS



     When archiving a model (CDWRITE command) that has the Pre-

     conditioned Conjugate Gradient (PCG) solver activated, the resultant

     file now contains the correct command for activating the PCG solver.



     Specifying uniform contour values for displays (/CONTOUR command)

     now works properly in ANSYS/Thermal and ANSYS/Emag.



     The status report that prints out after an IGES transfer is

     completed is now the same as in Revision 5.2.



     The messages produced when there is not enough memory for the Block

     Lanczos solver now reports the correct values for memory available

     and memory required.



GRAPHICS



     A problem with the GUI operating slowly on some PCs has been

     corrected.



     A legend now appears when surface loads are displayed.



     Modal animation on the PC has been corrected to animate forward-

     reverse-forward since the media player has a forward only

     limitation.  This permits animation of the full mode cycle.



     Animation now works correctly on PCs using minimum required colors.



ANSYS DISPLAY Utility



     In the DISPLAY Utility on the Windows NT and Windows 95 versions,

     the "cancel" button in the "Open Color Map File" and "Save Graphics

     File (Color Sorted)" windows now works properly.



ANSYS/LS-DYNA



     The EDLOAD command now correctly transfers rotation nodal degree of

     freedom nodal loads (Lab=ROTX, ROTY or ROTZ).  This error is

     reported in Class3 Error Report 96-48.



     All cases of rotated nodes are properly error trapped preventing

     their use in LS-Dyna (which does not support nodal rotations).  This

     error is reported in Class3 Error Report 96-49.



     The GUI now properly handles the entering of real constants for the

     COMBI165 element.



Reported Errors and Possible Workarounds



The following list provides information about some significant errors

that have been reported and describes workarounds where possible.



KEYWORDS:           USER INTERFACE           S-N TABLE



DESCRIPTION: In the General Postprocessing Fatigue S-N Tables, the

alternate stress vs. cycles tables are set up.  When the "Apply" or "OK"

button is picked, the "entire table", and not just the user's input, is

sent to ANSYS in the form of "FP" commands.  If the entire table is not

filled, the locations are sent as blanks or zeros.  When POST1 interprets

the GUI generated "FP" commands, a "zero" value will replace the value in

"STTTM" locations 1, 7, 13, 19, etc.  if the user did not fill these

locations.  The "FP" documentation does indicate that the value of zero

will be used in the "STTTM" location if a "blank" or "zero" is input;

however, this is an unexpected behavior when the data is coming from the

GUI table setup.



AFFECTED VERSIONS:  Rev.5.1, Rev. 5.2, Release 5.3



Page 2 of 5



WORKAROUND:  Issue an FP command for each value to be deleted.  For

example use FP,-7 to erase the value in location 7 in the S-N Table.



KEYWORDS:           USER INTERFACE           MATRIX27



DESCRIPTION:   The real constant dialog for MATRIX27 displays incorrect

values for the following items when editing an existing real constant

set:

     C25, C26, C27

If you are creating a new set or editing an existing one, the values

input will be correctly sent to ANSYS.



AFFECTED VERSIONS: Rev.5.1, Rev.5.2, Release 5.3



WORKAROUND:    If you use the dialog box for editing purposes, be sure to

set C25, C26, and C27 to the correct values before choosing OK.



KEYWORDS:           FLOTRAN        POST1     RESUME



DESCRIPTION:   FLOTRAN results are not saved from POST1.  Issuing a SAVE

and RESUME or just a RESUME will cause some results to be unavailable.



AFFECTED VERSIONS: Rev.5.1, Rev. 5.2, Release 5.3



WORKAROUND: Issue a SET command in POST1 after a RESUME.



KEYWORDS:           SOLID MODELING      IGES      CDWRITE        CDREAD



DESCRIPTION: Doing a CDWRITE.ALL may produce a.cdb file that does not

contain parameter data.  When a CDREAD, ALL is done, warning messages may

result, caused by the missing parameter data.



AFFECTED VERSIONS.  Rev.  5.2



WORKAROUND: None



KEYWORDS:      SOLID MODELING           MESHING        IGES



DESCRIPTION:  The aspect ratio checking for bricks is limited in the

mesher.  CHECK, ESEL, WARN does not perform this checking.



AFFECTED VERSIONS: Rev. 5.0, Rev. 5.0A, Rev.5.1, Rev.5.2, Release 5.3



WORKAROUND:    Limit the element sizes along the edge so that they stay

within a reasonable aspect ratio using good engineering judgment.



KEYWORDS:      SOLID MODELING           MESHING        IGES



DESCRIPTION: When meshing an area containing many tesselations, a large

amount of time may elapse due to the geometry of the area.  An example of

these geometries may be a large number of holes in the area.



AFFECTED VERSIONS:  Rev.5.1, Rev. 5.2, Release 5.3



Page 3 of 5



WORKAROUND: Reduce the number of holes (<15) in the affected areas.  This

can be done by splitting the area into a number of smaller areas.

Another way to decrease the amount of time spent meshing is to turn off

color shading if running interactively.



KEYWORDS:      SOLID MODELING           VROT           ARSYM



DESCRIPTION:   Performing a VROT after an ARSYM may generate an incorrect

element and nodal pattern in the resultant volume.



AFFECTED VERSIONS:  Rev.5.1, Rev. 5.2, Release 5.3



WORKAROUND:    After the ARSYM and before the VROT command, issue

NUMMRG,KP and NUMMRG,NODE to merge any coincident keypoints or nodes.



KEYWORDS:      SOLID MODELING           VEXT           CSYS



DESCRIPTION:   In a non-Cartesian coordinate system, the VEXT command

will locate the end face of the volume based on the active coordinate

system and the extrusion will be along a straight line between the end

faces.  This is not an error, but it may not produce the result you

expect.



AFFECTED VERSIONS: Rev. 5.0, Rev. 5.0A, Rev. 5.1, Rev 5.2, Release 5.3



WORKAROUND: A user may perform an extrusion along a "curved path" by

performing a sequence of VEXT operations along a piecewise linear line

that is a good approximation of the curved line.  Its success can not be

predicted easily and depends on the model and the choice of the

approximated piecewise linear line.



KEYWORDS:      SOLID MODELING           VEXT           AREAS



DESCRIPTION: When doing a VEXT on a set of areas, if an area that is

parallel to the line of extrusion is selected, the extrusion will be done

on all the areas including the parallel area.  However, any resulting

volume calculations will be incorrect based on the fact that the parallel

area was selected.



AFFECTED VERSIONS: Rev. 5.0, Rev.5.0A, Rev.5.1, Rev. 5.2, Release 5.3



WORKAROUND: Make sure that all selected areas are not parallel to the

line defining the extrusion direction.



KEYWORDS:      SOLID MODELING           LARC



DESCRIPTION: When performing an LARC command with a large radius and a

small arc angle, a complete circle may be produced.



AFFECTED VERSIONS: Rev. 5.0, Rev. 5.0A, Rev. 5.1, Rev. 5.2, Release 5.3



WORKAROUND: Use a straight line to connect the two keypoints.



KEYWORDS:      SOLUTION       GP        LSWRITE/LSSOLVE



DESCRIPTION: Having gap conditions (GP command) in a reduced or mode

superposition analysis and using the LSWRITE and LSSOLVE commands will

produce erroneous results.  The gaps are not supported properly in the

solution.



AFFECTED VERSIONS: Rev.5.0, Rev. 5.0A, Rev. 5.1, Rev. 5.2



Page 4 of 5



WORKAROUND: Use the SOLVE methods of specifying multiple load steps.

Refer to Basic Analysis Procedures Guide, Chapter 3 (ANSYS 5.3) or the

Procedures Manual, Chapter 10 (ANSYS 5.2 or earlier).



KEYWORDS:      SOLUTION       BEAM3     PIPES     TORSIONAL



DESCRIPTION: Beams and Pipes have no extra torsional resistance in their

stress-stiffness matrix.  No torsional resistance is added by turning

stress stiffening (SSTEF) on.  This is documented, but does not work as

may be expected.



AFFECTED VERSIONS:  Rev 5.1, Rev. 5.2, Release 5.3



WORKAROUND: Use 3-D solids.



KEYWORDS:      SOLUTION       BEAM3          NLGEOM



DESCRIPTION:   BEAM3 with large deflection (NLGEOM) turned on and under a

large axial load may not converge properly.



AFFECTED VERSIONS. Rev. 5.1, Rev. 5.2, Release 5.3



WORKAROUND: Turn on stress stiffening to aid convergence.



KEYWORDS: SHELL150       CP        MID-SIDE NODES      SOLUTION



DESCRIPTION: In SHELL150 (p-elemet), coupling of midside nodes (CP

command) is limited to transnational d.o.f.s only.  Any midside node

rotation d.o.f.s only.  Any midside node rotation d.o.f. that is part of

a CP command will be ignored from the coupled set.



AFFECTED VERSIONS: Rev. 5.2, Release 5.3



WORKAROUND:    None



AUTHOR:                                      DATE: October 21, 1996

               Michael F. Michalski



AUTHOR:                                      DATE: October 21, 1996

               Kenneth G. Pedlaszewski



REVIEWED BY QA:                              DATE: October 21, 1996

               William J. Bryan



APPROVAL:                                    DATE: October 21, 1996

               David Conover



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