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boundary conditions to minimize drag

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Old   April 29, 2014, 06:30
Default boundary conditions to minimize drag
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Olivia Nalen
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Hello everyone,

I'm trying to use AdjointShapeOptimizationFoam to optimize a drag coefficient of an airfoil.

I need to define boundary conditions wrt. cost function of drag coefficient. I have already seen in literature (Othmer) how to define the boundary conditions to minimize total pressure loss or power loss for ducted flows, but unfortunately I don't understand how should I change "adjointOutletPressure" and "adjointOutletVelocity" to minimize the drag coefficient of an airfoil?

So far, I've set Ua and pa = 0 at the inlet and at the outlet, because only the airfoil contour is important for this problem, but I still don't get how should I adjust the adjoint boundariy conditions at the airfoil contour?

I hope someone can help me at this

Kind regards,
Olivia
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Old   May 2, 2014, 07:08
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No one knows that?
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Old   May 26, 2014, 09:21
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Roland
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Hi,

This paper was helpful to me (On the Computation of Flow Sensitivities from Boundary Integrals):
www.scs.gmu.edu/~rlohner/pages/publications/papers/reno04adj.pdf

Good luck!

Sylvester
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Old   May 29, 2014, 14:54
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Olivia Nalen
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Thanks a lot! =)
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