LMS Virtual Lab & NASTRAN thermal analysis

[Acreeet]

Hello there,

I'm trying to carry out a NASTRAN Nonlinear static thermal analysis in a Virtual Lab interface.

I've created my geometry, defined my materials & properties, & applied my loads (Nodal flux to one surface). The analysis case was extracted to a .dat file to be inputted into NASTRAN solver. Once I input the .dat file to be solve, It fails & does not generate a .op2 file to in put into the VL interface. There's a picture attached of the solution log.

 

[BlasMolero]

Hello!,
Take a look to both the *.LOG and *.f06 nastran files, there you will see the reason of the error, it could be a license error (*.LOG file) or a model errors, in the *.f06 file make a shearch for the word FATAL, you will see there the description of the error, OK?.
Best rgards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
WEB:

http://www.iberisa.com

Blog de FEMAP & NX Nastran:

http://iberisa.wordpress.com/

 

[Acreeet]

Thank you for your quick response Blas

The only output files the NASTRAN solver generates are .f04, .f06, & .log file.
the first two are empty. The log file doesn't seem to indicate any errors. I've tried configuring the BAILOUT & POST parameters in the .dat file to get successful results but to no success.

I've attached the .log file for interest.

 

[BlasMolero]

Hello!,
I am not expert in MSC.NASTRAN but NX NASTRAN, but the message seems clear: either you don't have enought disk space in the Current Dir: "C:\My Solves" or write access. Make sure to create a subdirectoy without any space, for instance C:\MODELS. See the error:

The maximum available OPEN CORE size is 409484282 words.
Unable to allocate Open Core.
Requested size = 2047352576 bytes (7A081F00 hex)
GetLastError() returned 8 ("Not enough storage is available to process this command.").

Also, include the parameter MEM=2048MB to see if a ram memory limitation exist either.
Best regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
WEB:

http://www.iberisa.com

Blog de FEMAP & NX Nastran:

http://iberisa.wordpress.com/

 

[Acreeet]

is this inputted into the .dat file?

 

[Acreeet]

Hi,
I've inputted the "PARAM MEM 2048" into the parameters to fix the issue but the solver returned an error in the log file. f04 & f06 files were produced but were empty.

Any help would be much appreciated as I'm a new user of MSC NASTRAN

The following is the .dat file

http://dl.dropbox.com/u/17339566/TEST.dat

I've attached the log file.

Thank you

 

[BlasMolero]

Hello!,
This is not a parameter to include in the nastran bulk data, you have to define the memory assigned to the nastran solver via the LMS interface or usimg "keywords" when you launch the nastran jobs by means of the nastran command. The basic format of this command is:

nastran input_data_file keywords

where "input_data_file" is the name of the file containing the input data (say "your_model.dat") and "keywords" is zero or more optional keyword assignments. Keyword assignments consist of a keyword, followed by an equal sign, followed by the keyword value.

For example, to run an NX Nastran job using the data file "example.dat" and the amount of open core memory to allocate = 1024 mb, I will enter the following command:

nastran example.dat mem=1024mb

Then depending how you launch your nastran job, via LMS interface or by hand, you can choose the method you like.

Bst regards,
Blas.

~~~~~~~~~~~~~~~~~~~~~~
Blas Molero Hidalgo
Ingeniero Industrial
Director

IBERISA
48011 BILBAO (SPAIN)
WEB:

http://www.iberisa.com

Blog de FEMAP & NX Nastran:

http://iberisa.wordpress.com/

 

[Acreeet]

I allocated 2048 mb using the exaple you gave but got the same output. I then allocated 1024 mb, and generated an op2 file (1kb)....f06 file has 2 error codes which I'm working on.

 

[Acreeet]

This is the .f06 file.

 

[Acreeet]

Ok, problem has been solved.
One last error occurs when running the solution..

USER FATAL MESSAGE 4551 (NCONVG)

I've adjusted some of the parameters but nothing seems to work.