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Aerodynamic optimization : how to eliminate stalling wings ?

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Old   February 10, 2020, 09:23
Default Aerodynamic optimization : how to eliminate stalling wings ?
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Hi guys,

I'm actually working on the optimization of a leading edge of a morphing airfoil (single-element airfoil).
This optimization is done by varying its geometry for an angle of attack higher than the stall angle and therefore, some of the airfoils you get lead to stall.
However, once the stall is reached, value of the lift coefficient oscillates (i.e. RANS simulations of the airfoil don't converge) and sometimes, once the maximal iterations number is reached, the simulation stops while the lift coefficient is the highest.
Consequently Ansys thinks that this kind of design points are good But they are not !

I can't find a way to "eliminate" those airfoils in the optimizer. I already tried to use an average lift coefficient but Ansys doesn't accept it as an output parameter.
I also thought about using residuals as output parameters (and eliminate airfoils for which residuals are above a certain limit) but I can't find a way to do this.

Can someone help me ?

Thomas.
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Old   February 10, 2020, 10:10
Default Which optimizer
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You didn't mention which optimizer is being used; is it the optimization tool within the Fluent or is it based on DOE in the WB?
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Old   February 10, 2020, 10:24
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Quote:
Originally Posted by vinerm View Post
You didn't mention which optimizer is being used; is it the optimization tool within the Fluent or is it based on DOE in the WB?
Thank you for your answer and sorry for the lack of information.
I am using the one based on DOE in the WB.
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Old   February 11, 2020, 04:06
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No experience in WB
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