Wind profile boundary layer problem

rafamusura · October 4, 2012, 12:49

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, 11:42

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,
Eloïse

October 4, 2012, 12:49	Wind profile boundary layer problem	#1
rafamusura New Member Rafael Valenzuela Musura Join Date: Feb 2012 Posts: 27 Rep Power: 14	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

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October 5, 2012, 11:42		#2
Eloise Senior Member Eloïse Join Date: Jul 2012 Location: Trondheim, Norway Posts: 113 Rep Power: 14	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, Eloïse