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Absolute negative temperature for Material model-reg

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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





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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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