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-   -   Wind profile boundary layer problem (http://www.cfd-online.com/Forums/openfoam-solving/107713-wind-profile-boundary-layer-problem.html)

rafamusura October 4, 2012 11:49

Wind profile boundary layer problem
 
Hi everyone I'm simulationg a 3D delta wing in atmospheric conditions. I'm using the simpleFoam-motorBike configuration and everything seems to be ok, but the only problem I have is that the boundary layer formed over the ground isn't constant. It seems to me that when the patch of "inlet" start blowing it generates a boundary separation and that makes the wind profile not to be constant as I need.

Do anyone knows how to implement an inlet wind profile boundary condition?, I've tried swak4Foam to implement the groovy BC but I fail trying to make it work.

Please help me, I'm quite desperate here.

Thanks

Eloise October 5, 2012 10:42

Hi Rafael,

Are you aware of the wall function problems when simulating ABL flows? Blocken described it in some papers such as this one
http://www.sciencedirect.com/science...5223100600834X
If you don't adapt your mesh and wall function parameters to ABL flow, you will have large variations of your profile through your domain.

I hope this already helps a bit. I've never used swak4Foam but I'm planning to test it soon. Let me know if you manage to get it to work!
Regards,
Elo´se


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