|March 11, 2011, 14:53||
Multi element wing 3-d problem: trailing edge resolution
Join Date: Feb 2011
Posts: 1Rep Power: 0
I tried running a 3-d case for a multi element wing set and these are the results I got. The streamlines don't look wonky but when you look at the contour plots, something is definitely not letting the boundary layer resolve. I have also attached a post processing plot of the wall alone(the wing) which shows how the meshing has chipped part of the trailing edges. How can I avoid that?
I spoke to some CFD profs in the university and they weren't sure of the problem either. Their suggestion was that since this is a wing with a trailing edge thickness( i.e, not a sharp t.e) the minimum mesh size may be more than that thickness. Has anybody else seen this problem before? If so, what is the solution?
The mesh has 15 million elements. Also, the CAD geometry was imported as IGES from solid works and was clean when seen in the DM.
|March 13, 2011, 01:33||
Join Date: Dec 2009
Posts: 3Rep Power: 9
your mesh has 15 million elements... it is not shows the quality your mesh.
you have bad mesh around body, re-mesh surface on your body and then
do volume mesh
I have this problem before when the minimum mesh size be more than that trailing edge thickness ...
|March 13, 2011, 06:44||
Join Date: Mar 2009
Location: Sydney, Australia
Posts: 12,971Rep Power: 100
You do not appear to have inflation meshes. You are not going to get any useful results without a good inflation mesh.
The trailing edge problem is because it is equivalencing nodes through the wing thickness where it is thin. This can be a diabolical problem to fix. In ICEM you can declare thin cuts to handle this. CFX-Mesh is usually resistant to this sort of problem.
Did you mesh it in ICEM? Or in workbench using the patch independant mesher?
|cfd, multielement wings, trailing edge resolution|
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