Absolute negative temperature for Material model-reg

RAMGANESH
RAMGANESH Altair Community Member
edited October 2020 in Community Q&A

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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Answers

  • ydigit
    ydigit
    Altair Employee
    edited June 2015

    Could you please upload the .INP file?

  • acupro
    acupro
    Altair Employee
    edited June 2015

    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.

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