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Absolute negative temperature for Material model-reg

RAMGANESH

I have been working on internal flow analysis of an valve.

Boundary conditions are

Inlet- 4 Bar pressure

Outlet - Ambient condition

Output required - Velocity at the outlet.

Ideal Gas is the material medium.

I had set the boundary conditions as in the workshop 4 in the tutorial fro compressible flow

but i am getting an error as Absolute negative temperature for Material model

please provide valuable guidelines

Thanks

Ram

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ydigit

Could you please upload the .INP file?

acupro

The startup process with Ideal Gas can sometimes go poorly if the initial conditions are far from a physically correct state. We often suggest running a constant density case first - then restart with Ideal Gas density. Also, make sure the input file represents correct values for absolute temperature and pressure - initial conditions and boundary conditions.