[GiDlist] Exporting NASTRAN file from GID

Moderator: GiD Team

Gabriel Preda

[GiDlist] Exporting NASTRAN file from GID

Postby Gabriel Preda » Tue Oct 12, 2004 2:55 am

Hi.
I am new around.
I work for a company comercializing a stand-alone high performance electromagnetic analysis
software (EMSolution from SSIL Inc. Tokyo, Japan);
I was testing Gid in view of recommending as the pre/post-processor of choice for our clients.
Currently we recommnend FEMAP but as our customer pool is increasing (and their budget
size average is shrinking) Gid becames very interesting.

We currently include NASTRAN as preprocessor format for our software so the transfer must be very
smooth, we thought.
But, surprise, our Windows version release 7 Gid (1 month trial version) exports NASTRAN 2D mesh (first trials)
in a strange form, as follows:

-if only triangular mesh is present in a model, material properties (or property ID's) set to elements are outputted \
correctly in NASTRAN format;

-if only quad mesh is present in a model, material properties (or property ID's) set to elements are all reset to the
last ID; for example, if we define 4 property ID's (and thereforre, the mesh must have 4 different regions each with his
own property), the exported mesh will have only one property.

-if the mesh contains both tri and quad subdomains (let's say, surfaces meshed with tri mesh and quad mesh), the
NASTRAN mesh is outputted with 2 properties: one is assigned to triangular meshed regions and another property
is assigned to quad meshed regions;


Details: materials were created using "ANSISbla-bla-plate type)
NOTE: No problem with the GID (*.msh) file exported; I inspected the ASCII file and it's straight; properties are there
where should be;

Questions:
1. Is the behavior experienced before by anyone?
2. Could this be only a problem with the trial version, maybe?

Observation: of course, inspecting the GID format, we also realized that it is simple to parse and it will be very easy
to include the format in our set of supported formats but stil we ould like to offer also NASTRAN format.

Sincerely ,
Gabriel Preda

Gabriel Preda
Science Solutions International Laboratory, Inc.
2-21-7, Naka-cho, Meguro-ku, Tokyo 153-0065 JAPAN
Phone:+81-3-3711-8900, Fax:+81-3-3711-8910
E-mail: preda at ssil.co.jp
http://www.ssil.com
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Enrique Escolano

[GiDlist] Exporting NASTRAN file from GID

Postby Enrique Escolano » Wed Oct 13, 2004 4:26 pm

This is a small bug on the NastranMesh.bas template (written the quadrilateral's material).
I attach the corrected template. You must copy it inside the directory /templates of GiD.

This template is only a demostration of GiD customization. It does'nt include off course all NASTRAN capabilities.

You can also download the GiD-Nastran 'problemtype', a good GiD to NASTRAN customization, including materials, boundary conditions,
etc, and the output of the calculation file in NASTRAN format. (the NASTRAN solver is not included)

Can download this problemtype, directly from the GiD menu: Data-Problemtype-Interenet retrieve... Nastran 2.4
or from the GiD+ page: http://www.gidhome.com/gidplus , and unzip it inside the /problemtypes GiD directory

Regards

Enrique Escolano
----- Original Message -----
From: Gabriel Preda
To: gidlist at gatxan.cimne.upc.es
Sent: Tuesday, October 12, 2004 3:47 AM
Subject: [GiDlist] Exporting NASTRAN file from GID


Hi.
I am new around.
I work for a company comercializing a stand-alone high performance electromagnetic analysis
software (EMSolution from SSIL Inc. Tokyo, Japan);
I was testing Gid in view of recommending as the pre/post-processor of choice for our clients.
Currently we recommnend FEMAP but as our customer pool is increasing (and their budget
size average is shrinking) Gid becames very interesting.

We currently include NASTRAN as preprocessor format for our software so the transfer must be very
smooth, we thought.
But, surprise, our Windows version release 7 Gid (1 month trial version) exports NASTRAN 2D mesh (first trials)
in a strange form, as follows:

-if only triangular mesh is present in a model, material properties (or property ID's) set to elements are outputted \
correctly in NASTRAN format;

-if only quad mesh is present in a model, material properties (or property ID's) set to elements are all reset to the
last ID; for example, if we define 4 property ID's (and thereforre, the mesh must have 4 different regions each with his
own property), the exported mesh will have only one property.

-if the mesh contains both tri and quad subdomains (let's say, surfaces meshed with tri mesh and quad mesh), the
NASTRAN mesh is outputted with 2 properties: one is assigned to triangular meshed regions and another property
is assigned to quad meshed regions;


Details: materials were created using "ANSISbla-bla-plate type)
NOTE: No problem with the GID (*.msh) file exported; I inspected the ASCII file and it's straight; properties are there
where should be;

Questions:
1. Is the behavior experienced before by anyone?
2. Could this be only a problem with the trial version, maybe?

Observation: of course, inspecting the GID format, we also realized that it is simple to parse and it will be very easy
to include the format in our set of supported formats but stil we ould like to offer also NASTRAN format.

Sincerely ,
Gabriel Preda

Gabriel Preda
Science Solutions International Laboratory, Inc.
2-21-7, Naka-cho, Meguro-ku, Tokyo 153-0065 JAPAN
Phone:+81-3-3711-8900, Fax:+81-3-3711-8910
E-mail: preda at ssil.co.jp
http://www.ssil.com
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