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-   -   compressible flow boundary conditions (http://www.cfd-online.com/Forums/fluent/29270-compressible-flow-boundary-conditions.html)

yangqing January 21, 2002 10:34

compressible flow boundary conditions
 
for compressible flow. can it lead to error that specify the inlet with vilocity inlet? i have tried a case,the residual of mass rise very fast.then disconvegence

Karl January 21, 2002 12:10

Re: compressible flow boundary conditions
 
For compressible flow a "Mass Flow Inlet" - boundary will give you better results. For the outlet boundary use "Pressure Outlet" , but you have to be careful to set proper values for the backflow values (only needed if reversed flow occurs at the outlet).

yangqing January 22, 2002 10:19

Re: compressible flow boundary conditions
 
in my case,oulet is a mechanic fan. i only know the mass flow rate, not the pressure jump. how can i specify the out boundary condition thanks


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