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-   -   Suction Boundary Condtions (http://www.cfd-online.com/Forums/fluent/99035-suction-boundary-condtions.html)

Zacc March 24, 2012 16:15

Suction Boundary Condtions
 
Hi everyone,

I am working on the separation bubble over a flat plate in Fluent. Now a problem come over. I would like to do a suction over farfield under boundary conditions that will satisfy ”du/dy=0“ wall-specified Shear and "v(x)=profile“ for suction in the same time.How can I do that? I can't find a boundary condition that satisfy the problem in the same time.

Please help me! Thank you so much!

LuckyTran March 25, 2012 04:17

Quote:

Originally Posted by Zacc (Post 351261)
Hi everyone,

I am working on the separation bubble over a flat plate in Fluent. Now a problem come over. I would like to do a suction over farfield under boundary conditions that will satisfy ”du/dy=0“ wall-specified Shear and "v(x)=profile“ for suction in the same time.How can I do that? I can't find a boundary condition that satisfy the problem in the same time.

Please help me! Thank you so much!

Does the outflow boundary condition not satisfy your demand?

Implementing that type of boundary condition is difficult since, it isn't even a boundary condition. Strictly speaking, boundary condition must be implemented directly, that is make your domain large enough to contain the farfield boundary and then set the appropriate pressure/velocity boundary condition. Specifying an outlet velocity profile is inconsistent with solving for the solution upstream of it.

However, on many grounds, the outflow boundary condition should accomplish a similar effect.


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