1-5233716      2001.0.9    Dynamics - MEFFMASS - UFM 2025 (EFFMAS)

In a large model that has many coordinate systems and requesting effective mass 
output (MEFFMASS), the job may fail with the following error messages 

*** USER FATAL MESSAGE 2025 (EFFMAS)
     UNDEFINED COORDINATE SYSTEM ID =  xxxx

 *** SYSTEM INFORMATION MESSAGE 1156 (XCLNUP)
     GINO FILE  301 WAS LEFT OPEN AT PROGRAM TERMINATION.

This error occurs even though the coordinate system referenced in the message 
exists.

Avoidance:  The effmass.v707 alter from the v70.7 sssalter library provides 
similar output and this alter will run in v2001 also.  Removing unused CORD2R 
entries may also allow the job to run successfully.

1-5469524      2001.0.9    Nonlinear Analysis - TET10 - Possible Wrong Answers

When using the nonlinear tet10 elements, if the material is elastic perfectly 
plastic and the default grid option is used, then the stresses may be 
incorrect.

Avoidance:  Use the GAUSS option by specifying GAUSS in field 6 of the PSOLID 
entry.

1-5931701      2001.0.9    Nonlinear Analysis - TET10, PLASTIC - UFM 4551 (NCONVG)

The TET10 element has problems converging in nonlinear analysis in the plastic 
range. This problem may lead to the following fatal message:

*** USER FATAL MESSAGE 4551 (NCONVG)
     *** STOPPED PROBLEM DUE TO FAILED CONVERGENCE

Avoidance:  The problems has been corrected in Version 2001.0.9 available on 
the Nastran 2001 R4 CD.

1-6521817      2001.0.9    Heat Transfer - RMG2 - SFM 4276, Traceback

Very large heat transfer jobs that calculate large view factors may fail with a 
traceback in rmg2.  

Avoidance:  The failure occurs when the memory requirement is calculated and 
overflows.  There is no avoidance.  

1-6953959      2001.0.9    Loads - OLOAD and SPCFORCE Resultant Output Incorrect
use param,resltopt,1 to get correct

The oload and spcforce resultants are incorrect in v2001.0.4 and later systems 
if global coordinate systems are present and loads and/or spcs are applied to 
grid points that reference an output coordinate system.

Avoidance: Use param,resltopt,1 to get correct results but in the old format


1-7055609      2001.0.9    Aeroelastic Analysis - Flutter roots not sorted for the PKNL method

The sorting of flutter roots that is used for the PK and PKNL is disabled when 
the density used in the analysis changes.  Since the PKNL method is likely to 
change the density value for each analysis triplet, this effectively means that 
the roots are not sorted.  

Avoidance: Use the PK method or perform the sorting as a post-processing 
operation.

1-7510324      2001.0.9    Aeroelastic Analysis - Different Flutter Solutions for Supersonic Speeds

The AMG module generates a different aerodynamic matrix across different 
machine types for supersonic Mach numbers.  The largest difference was found on 
Windows/NT and the HPUX(64-bit) machines.   

Avoidance:  There is no avoidance.

1-7514301      2001.0.9    Optimization/Design Sensitivities - PCOMP - Wrong Answers

A composite optimization job may produce incorrect sensitivities when the 
following two conditions are met:

1) Any material properties referenced by PCOMP entries are being designed;
2) The designed PCOMPs are referenced by more than one composite elements.

In addition, when a dummy PCOMP is present, the sensitivity coefficients may 
also be incorrect. 

Avoidance: There is no avoidance for the first case.  However, for the case of 
a dummy PCOMP entry, rename the PID to the smallest number among all PCOMP IDs.

1-7734165      2001.0.9    Aeroelastic Analysis - AESURF - Missing Output

The printed output of the INERTIAL nondimensional hinge moment derivative 
coefficients may not print in the proper table of the output in the f06 file.  
If some AESURF entries have associated AESURFS entries and there are other 
AESURF entries without associated AESURFS entries having identification numbers 
lower than the AESURF with AESURFS, then the printed output of the 
nondimensional hinge moment derivative coefficients will NOT appear in the 
appropriate table in the f06 results.

Avoidance:  The only avoidance is to renumber the AESURF entries.