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Modelling Air as Solid Body for Optistruct/Radioss

Hi everyone,

I want to model air inside a metal box in Hypermesh and would like to see the pressure on the inner surface of the box due the thermal expansion of the air inside. I have options to use Optistruct and Radioss to run it. I would like to model the air as a solid/shell mesh, as a idea gas. So what material card do I have to use for air, so that I can deifne is as an Ideal gas and what property card?

thanking you all.

regards,

Debarshi

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Adriano_Koga

In OptiStruct you can use psolid and assign a material with air properties.

For RADIOSS you have more options, including material hydro. You could use SPH to model the particles for example.

There are a few examples in the documentation of RD using sph or ALE.

Debarshi

Thanks for the reply. In optistruct, what material card do I need to use? And in Radioss, will 'RD-E: 4300 Perfect Gas Modeling with Polynomial EOS' example help?

Adriano_Koga

In OS very simplified you will use an isotropic material MAT1, with alpha as coeff thermal expansion