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July 21, 2015, 06:16 |
Trailing edge sensitivity anlaysis
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New Member
Join Date: Nov 2014
Posts: 12
Rep Power: 11 |
Hi all,
Within my thesis for the TU-Delft I use SU2 for gaining sensitivities of lift and drag of a wing w.r.t. the FFD control points. When I compare the (converged) sensitivities with Finite Difference its a match everywhere, expect for the last three rows of FFD control points near the trailing edge. See the attachment, where control point 0 is the upper control point at mid-span at the leading edge, control point 11 is the upper control point at mid-span at the trailing edge. The mesh and ffd-box definition I used is also attached. When I look at the senstivity comparison done in the release paper of SU2 (paper AIAA 2013-0287, page 51) the control points near the trailing edge are not included in the comparison. Is this a known problem? Is there a fix? I am using v3.2.8 with Euler and have not tried v4.0 nor RANS yet, but are the sensitivities near the trailing edge improved for that version or governing equations? I already tried refining the mesh, a mesh with a blunt trailing edge and changing the numerical method and order for the adjoint solution, but without success. For my thesiswork I am deforming whole airfoil sections at once, therefore I cannot simply exclude the TE from my design variables neither can i make the surface sensitivities 0 at the trailing edge (with the sharp edges option in the config file). I hope someone can help me with this problem, Thank you in advance, JanH |
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