MD Nastran/MSC.Nastran Current Error List Current Update: Jan 14, 2011 ----------------------------------------This file contains a. All "General Limitations" b. All errors that have not been corrected in a released version. If the Version = "GL" then this indicates a General Limitation which indicates a fix is not planned. Continuous updates to the error list are available to MD Nastran / MSC Nastran clients on the MSC SimCompanion web page http://simcompanion.mscsoftware.com/infocenter/index?page=content&id=KI8008006 The MSC Support pages can also be used to search for keywords to easily locate individual errors - http://simcompanion.mscsoftware.com Known Error
CR 890
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Grid Point Force - GPFDR - UFM 3008 The open core requirement for the GPFDR module can be as large as (6 X BUFFSIZE + 14 X number of grids) if the grids use a nonrectangular displacement coordinate system. For problems in basic coordinates, the grid requirement drops to 8 X number of grids.
Known Error
CR 1103
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Dynamic Response - TRD, TRD1, FRRD, FRR - UFM 3005 If the MGIV method of real eigenvalue extraction computes modes for massless DOF with uncoupled stiffness terms, the eigenvalue is large (1.E+35) as it should be, but the generalized stiffness is 0.0 (it should also be 1.E+35). Null eigenvectors may be produced. An avoidance is to use PARAM,HFREQ or PARAM,LMODES to discard these bad modes in dynamics.
Known Error
CR 1758
Product
MSC / MD Nastran
Corrected Version GL Abstract
Cyclic Symmetry - Restarts - Various
Description
In superelement static cyclic symmetry (SOL 81), some restart paths do not function well. The following
Known Error
CR 1758
restart paths have been demonstrated to work, using the indicated input and DMAP Alters. Other types of restarts can be made, using these techniques. A. Conventional Superelement Restarts. Use the same techniques applicable to noncyclic symmetry superelement analysis. 1. Exit during Phase I. 2. Structural Changes in a Superelement. 3. Load Change Restart
B. Time Limit in a Harmonic Loop SET N = 0, residual only SEMG = N PARAM,RESDUAL,-1 (bulk data) Input all bulk data, or use PARAM,NODATA,-1 and delete all the bulk data except PARAM entries.
C. Loads Change in One Tip Superelement, Same Number of Loading Conditions, Sam Known Error
CR 1956
Product
MSC / MD Nastran
Corrected Version GL Abstract
Differential Stiffness and Buckling - QRG, GAP Element - SFM 4202
Description
The GAP element has no differential stiffness and produces SFM 4202 when used in conjunction with Solution 64 or SOL 4.
Known Error
CR 2004
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Cyclic Symmetry - GPFDR - CPU Loop Using SUBCOM/SUBSEQ commands in Cyclic Symmetry will result in i n a CPU loop in the GPFDR module. Cyclic Symmetry does not support the use of SUBCOM/SUBSEQ commands in the case control.
Known Error
CR 2004
An avoidance is to replace the SUBCOM with an appropriate SUBCASE and combine loads by using the LOAD Bulk Data card. Known Error
CR 2038
Product
MSC / MD Nastran
Corrected Version GL Abstract
Elements - Composite Transverse Shear Modulus Limitations
Description
The transverse shear flexibility terms for composite plate elements calculated from the PCOMP and MAT8 entries assume that primary bending occurs in the overall material coordinate system defined by the angle on the CQUAD4 (CTRIA3, etc.) entries. Transverse shear flexibility and stresses may have poor accuracy if transverse shear bending loads are not in the direction of the material X and Y axes, or if significant twist loads are present. This is a general limitation in all general purpose finite element programs due to the plate having insufficient degrees of freedom to account completely for stresses caused by both transverse shear bending loads and twist loads. This is documented in other words in the MSC/NASTRAN V68 Reference Manual, Chapter 6 - Material Properties, Section 6.5 -
Known Error
CR 2090
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Dynamic Response - DDR2 - GINO FATAL ERROR 3012, UFM 5423 When the modal acceleration data recovery method is used in SOL 31 or SOL 72 and a SUPORT entry is present, SFE 3012 may result in the t he DDR2 module. Since in most conditions the SUPORT entry must be present in a modal transient response with rigid body modes, the mode acceleration method met hod may not be used on a structure having rigid body modes. There is no known avoidance.
Known Error
CR 2113
Product
MSC / MD Nastran
Corrected Version GL Abstract
MSGMESH, MSGSTRESS, MSGVIEW - MAREA - Fatal Error
Known Error
Description
CR 2113
When the MAREA entry is used to equivalence parallel generator lines to a single active line, MSGMESH may incorrectly equivalence end points of the parallel generator lines. An avoidance is to use MLINE entries after the offending MAREA entries to equivalence end points of the generator line to single active points.
Known Error
CR 2206
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Response Spectra - SDR2 - Missing Output A request for acceleration or velocity output at a given set of points in a response spectra run will not be honored unless a displacement request for the same set of points is also present. An avoidance is to include a displacement request for the same set of points where accelerations or velocities are requested. For example: SET 28 = 1,7,9,12,56,83 DISP(PLOT) = 28 ACCEL = 28 VELO = 28
Known Error
CR 2251
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Aeroelastic Analysis - SOLs 75 and 76 - Restarts To perform efficient restarts with aeroelastic solution sequences, one may be required to possess knowledge of the manner in which the DMAP handles the looping over the Mach number and reduced frequency pairs. This DMAP knowledge is only required when a run is terminated during the aerodynamic matrix generation loop. A typical termination may be caused by exceeding the allowed CPU time. Another case may occur when the user wishes to switch from SOL 75 and restart in SOL 76, but has not included the entry PARAM,GUSTAERO,-1 in the SOL 75 run. The DMAP loop which includes the AMG and AMP modules was written expressly to perform efficient restarts for generation of the
Known Error
CR 2251
aerodynamic matrices. However, this efficiency comes with an associated cost. The decomposition factors of the ae Known Error
CR 2322
Product
MSC / MD Nastran
Corrected Version GL Abstract
Documentation - MSGMESH Analyst's Gu - Incorrect Documentation
Description
On page 3-3 in the MSGVIEW portion of the MSGMESH Analyst's Guide, it states that MSGVIEW plot sets are printed in the the MSGMESH output. This print option was removed prior to the release of MSC/NASTRAN Version 64.
Known Error
CR 2341
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Geometric Nonlinearity (SOL 64 - Follower Forces, SPC - Wrong Answers In SOL 64, follower forces are computed using the load requests of the present iteration and the geometry of the previous iteration. However, the geometric effects on follower forces, implied by a SPCD request, is not reflected until the next iteration. There is no known avoidance.
Known Error
CR 2378
Product
MSC / MD Nastran
Corrected Version GL Abstract
Eigenvalue Analysis - Lanczos - Unexplainable User Message
Description
If the Lanczos method is used for an eigenvalue analysis, the following termination message may be issued in the eigenvalue analysis summary: NOT ALL EIGENVALUES FOUND IN RANGE. This message is given when three consecutive shifts have failed to produce any new eigenvalues. (V65 only) Avoidance: There is no known avoidance. The user should try rerunning the problem with a different frequency range in order to force the shift algorithm to select a different series of shift values. Please refer to Error 2571 for a related error.
Known Error
CR 2471
Known Error
CR 2471
Product
MSC / MD Nastran
Corrected Version GL Abstract
Frequency Response and Random - RANDOM - Wrong Answers Error 2423 and General Limitation 1602 instruct the user to duplicate requests for random analysis of the solution set in SOL 71, once as a solution set request, ie. SDISP, and once as a nonsolution set request, ie. DISP. However, when more than one subcase is involved on the related RANDPS Bulk Data entry, the PSDF results will incorrectly be that of only one subcase.
Description
Avoidance: To get proper results the user must strictly adhere to the following procedure: 1. You must make a case control request for the t he solution set variables desired, SDISP, SVELO or SACCE, with the SORT2 modifier. Physical output requests should not be included within the same run. 2. The XYPLOT requests for random output should be for the ph
Known Error
CR 2583
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Material Nonlinearity - NLITER - UWM 5409, UFM 4553, 4542 If in material nonlinear analysis the structure is not subjected to any mechanical loads but is subjected to thermal loads, UFM 4542: NO LOAD INCREMENT EXISTS FOR NONLINEAR SUBCASE may be output. This is a limitation of the design and will happen whenever the temperature loads cause no loads to be passed down to the l-set. For example, a symmetric flat plate supported on all sides or a simple beam supported on both ends subjected to only thermal loads will produce the fatal message. A possible alternative to UFM 4542 is some noise loads get passed down to the l-set and job will fail with maximum number of bisections or minimum load step has been reach. Avoidance: If the fatal message is obtained, a small dummy mechanical load will have to be applied.
Known Error
CR 2588
Known Error
CR 2588
Product
MSC / MD Nastran
Corrected Version GL Abstract
Elements - CBAR,CBEAM - Poor Answers If the orientation vector for a CBAR or CBEAM element is defined nearly parallel with the elements axis, UFM 2026 may fail to appear. The resulting element coordinate system may be randomly defined, which may result in poor answers depending on the section properties of the element.
Description
Avoidance: The user should ensure that the orientation orie ntation vectors are at an angle of at least one degree from the element axis so as not to introduce numerical difficulties in the problem. In Version 66 this error message has been changed to UWM 5464 or 5487 which will be issued whenever the orientation angle is less than one degree. In Version 66 if the orientation angle is exactly zero, then the job will eventually fail. Some machines may issue SFM 4276 EC 7777 in the output, however, other may
Known Error
CR 2641
Product
MSC / MD Nastran
Corrected Version GL Abstract
Material Nonlinearity - NLITER, MPYAD - SFM 3001, SFM 3007, UFM 5423 CLOAD entries must be used to apply load to upstream superelements in SOL 66. If loads are applied upstream and CLOAD entries are not used, SFM 3001 and SFM 3007 will be output from the NLITER module.
Description Avoidance: Input the required CLOAD Case Control and Bulk Data entries to avoid this error. See Application note dated June 1990 for proper application of CLOAD input. Known Error
CR 2664
Product
MSC / MD Nastran
Corrected Version GL Abstract
Documentation - MSGMESH, EDGER - MSGMESH ERROR 9358
Description
On page 14-31 of the MSGMESH manual, Remark 3 under the EDGER entry states that: "Thirty triplets of entries Di, Gi and Gi+1 may be entered on a single logical EDGER card." In fact, if more than 16 triplets are specified on a single logical EDGER entry MSGMESH ERROR 9358 will result.
Known Error
CR 2698
Product
MSC / MD Nastran
Corrected Version GL Abstract
Miscellaneous - PREFACE - O/S Error The scratch files, NSTNxx, on the IBM MVS-SP and IBM MVS/XA systems cannot be allocated using the block option on the space parameter. If the block option is used as a space request for these files, the following message may appear in the JES-LOG: AB002I STOP NO SCRATCH UNITS ASSIGNED(NSTNXX). (IBM MVS and IBM MVS/XA only)
Description Avoidance: The avoidance is to specify space requests using cylinders or tracks. The delivered MSC/NASTRAN Procedure allocates the NSTNxx files with cylinders, therefore, if the user wishes to change these requests, he must use tracks. This limitation applies to temporary files only. Hence, permanent files, such as the DB01 and NPTP, can be allocated using the block option. Known Error
CR 2772
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Geometric Nonlinearity - - Poor Answers Analysis of structures including the effects of prestress (differential stiffness) assumes that the loads remain constant in direction. If SOL 64 or 66 is used to form a stiffness matrix, and the matrix is used in another solution sequence (like 63 or 69) , and there are follower force effects (like thermal or pressure loads), then some terms te rms are missing in the equations. The effects are sometimes small, and can be neglected. An error will show up as an effective rotation spring for free body motions. Avoidance: The differential stiffness approximation used in MSC/NASTRAN does not account for follower force effects such as thermal loads. Thus, there is no known avoidance.
Known Error
CR 2805
Product
MSC / MD Nastran
Corrected Version GL Abstract
Eigenvalue Analysis - CEAD - Poor Answers
Description
For numerically difficult complex eigenvalue problems, such as those that have large gaps between eigenvalues, the accuracy of the Hessenberg Method
Known Error
CR 2805
of complex eigenvalue extraction is sensitive to the number of bits utilized by the machine to represent a number's mantissa. The fewer few er bits used, the more likely significant error will occur. Avoidance: Difficult problems as described above should be broken up into smaller search regions. Known Error
CR 2822
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
DBC/TRANS/ACCESS - DBC - Missing Output Although PARAM,POST,0 is supported in most solution sequences in Version 66, the MSC/GRASP or MSC/XL databases thus created may not be correct. Data blocks may be missing, the headers may be nonstandard, or the content of the data blocks may be incorrectly formatted. This affects all programs which later access these databases, including MSC/GRASP, MSC/XL and user written programs. The solution types that are affected are Complex Eigenvalues, Heat Transfer, Aeroelastic Analysis, Cyclic Symmetry, Buckling and Design Optimization. The specific solution sequence are affected are: 67,70,74,75,76,81,82,83,88,89,105,107,110, 114,115,118,144,145,146,153,159,200 This error can sometimes be recognized by the issuance of "*** SYSTEM WARNING MESSAGE 6065 (DBC), *** DBCMSG ERROR
Known Error
CR 2925
Product
MSC / MD Nastran
Corrected Version GL Abstract
Description
Miscellaneous - XSORT - SFM 3008, Insufficient Core Available The bulk data sort module requires that all continuation entries fit in real memory. If they do not, the XSORT module will fail with SFM 3008 "Insufficient Core Available for Subroutine XSOPIV". Avoidance: Having deck in sorted order and increasing core are the only known avoidances.
Known Error
CR 2934
Product
MSC / MD Nastran
Corrected Version GL