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-   -   Artifitial walls at outlet (https://www.cfd-online.com/Forums/cfx/85355-artifitial-walls-outlet.html)

oyvinl February 23, 2011 17:31

Artifitial walls at outlet
 
I`m simulating a centrifugal compressor and have a problem with the outlet boundary. The Outlet BC is set to "Outlet" with a mass flow. The problem is that when simulating, walls (about 0,5 % of area) are constructed to prevent flow into the domain. I know that 0,5% may not affect the solution, but still... I read that the solution is to place the outlet far away from the blade (50-100%) of the chord length.. I have placed the outlet at various distance, and are now at about 300% of chord length, but the problem remains.:mad:

Can it be a physical problem, or is this just a problem with CFX??

ghorrocks February 23, 2011 17:45

It looks like you have a long, thin separation. Sometimes these can take a long time to settle out. I think you just have to go longer on your outlet runner if you wish to eliminate it.


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