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convergence problem with compressible flow

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Old   July 1, 2015, 15:47
Default convergence problem with compressible flow
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sarah l is on a distinguished road
I know my problem is so tacky and discussed a lot in this forum but let me raise again this problem by considering models and materials I employed.
I want to simulate flow through porous media. the fluid is Nitrogen. while I consider it incompressible flow , there is not any problem but by considering N2 compressible flow (ideal gas or real gas) , the convergence problem appears!

I use Fluent 14.5 and the convergence criteria were set at 10^-3.
Boundary condition for inlet, velocity-inlet and for outlet , pressure-outlet.T_in=773 and T_out=1173.


P.S. I did every thing related to under relaxation factors and value limitations. Also I changed solver from pressure based to density based.
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