Problem with the bc of wind tunnel

teodm · May 27, 2017, 20:49

Hello foamers,
I am running a simulation in openfoam for a flow over two 3d wings in order to see the corotating vortex behind the wings. I have made my mesh using snappyhexmesh and I have checkmesh it. I run with simple foam and spalartalmaras ddes but my solution doesn't converge. So I think the problem is with the boundaries conditions. I have four boundaries inlet outlet walls(the wind tunnel) and wings. For the walls I first used the symmetry boundary condition and then I used no slip conditions but in both cases I didn't have satisfactory results. Does anyone have an idea for the boundary condition I have to use?. Thank you very much in advance!
Thodoris

Milad Mohassel · May 28, 2017, 00:24

Hi teodm
I have a question for you is simplefoam capable of using LES type turbulence models?
Cause I think simplefoam isn't transient solver!
I think Pimplefoam is a suitable solver for your case.

Sent from my iPhone using CFD Online Forum mobile app

teodm · May 28, 2017, 04:35

Hi Milad,
Thank you very much for your answer. I found it in the tutorials of airfoil2d I think, simplefoam along with LES

teodm · May 29, 2017, 03:54

I have also run with komega SST and spalart almaras but comparing the three results the sa-DDES are the ones closer to the experimental but still not as much close as i want to.That's why i think the problem has to be with the boundary conditions of the wind tunnel.If anyone could lead me to something it would be very helpful

May 27, 2017, 20:49	Problem with the bc of wind tunnel	#1
teodm New Member Thodoris Join Date: Apr 2016 Location: Greece Posts: 26 Rep Power: 10	Hello foamers, I am running a simulation in openfoam for a flow over two 3d wings in order to see the corotating vortex behind the wings. I have made my mesh using snappyhexmesh and I have checkmesh it. I run with simple foam and spalartalmaras ddes but my solution doesn't converge. So I think the problem is with the boundaries conditions. I have four boundaries inlet outlet walls(the wind tunnel) and wings. For the walls I first used the symmetry boundary condition and then I used no slip conditions but in both cases I didn't have satisfactory results. Does anyone have an idea for the boundary condition I have to use?. Thank you very much in advance! Thodoris

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May 28, 2017, 00:24		#2
Milad Mohassel New Member Milad Join Date: May 2016 Location: Tehran Posts: 3 Rep Power: 9	Hi teodm I have a question for you is simplefoam capable of using LES type turbulence models? Cause I think simplefoam isn't transient solver! I think Pimplefoam is a suitable solver for your case. Sent from my iPhone using CFD Online Forum mobile app

May 28, 2017, 04:35		#3
teodm New Member Thodoris Join Date: Apr 2016 Location: Greece Posts: 26 Rep Power: 10	Hi Milad, Thank you very much for your answer. I found it in the tutorials of airfoil2d I think, simplefoam along with LES

May 29, 2017, 03:54		#4
teodm New Member Thodoris Join Date: Apr 2016 Location: Greece Posts: 26 Rep Power: 10	I have also run with komega SST and spalart almaras but comparing the three results the sa-DDES are the ones closer to the experimental but still not as much close as i want to.That's why i think the problem has to be with the boundary conditions of the wind tunnel.If anyone could lead me to something it would be very helpful