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Compressible, turbulent flow in a pressure tube

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Old   August 4, 2005, 04:23
Default Compressible, turbulent flow in a pressure tube
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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!
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Old   August 5, 2005, 08:21
Default Re: Compressible, turbulent flow in a pressure tub
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for the second question, you should adjust your grid. hope any help.
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Old   August 9, 2005, 01:47
Default Re: Compressible, turbulent flow in a pressure tub
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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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