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-   -   Compressible, turbulent flow in a pressure tube (http://www.cfd-online.com/Forums/fluent/37475-compressible-turbulent-flow-pressure-tube.html)

Mario August 4, 2005 04:23

Compressible, turbulent flow in a pressure tube
 
Dear all,

I am trying to compute air flow through a total-pressure tube with the segregated solver. The flow is compressible (ideal gas law) at Ma=0.26 and turbulent (standard k-e). I am using velocity-inlet and pressure-outlet as boundary conditions. I have set the operating pressure to zero. Unfortunately I cannot get the solution converged. Either I get a divergence detected in pressure correction or the residuals are oszillating. Any suggestions are highly appreciated!

lily August 5, 2005 08:21

Re: Compressible, turbulent flow in a pressure tub
 
for the second question, you should adjust your grid. hope any help.

john August 9, 2005 01:47

Re: Compressible, turbulent flow in a pressure tub
 
Mario,

You cannot use a velocity inlet boundary condition with a compressible fluid. You need to use either mass flow inlet or pressure inlet. If you know the inlet velocity, you can calculate the inlet mass flow ok.


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