How to make skin friction drag optimization

McAero · December 10, 2017, 17:11

Hello all,

I hope someone can help me

How can I make skin friction optimization for a 2D airfoil?
I wanna select the optimum chord, angles, and radii of the geometry of the airfoil?
Also, if someone has explanation for the terms in the optimization cfg files maybe it help me understand

Thanks in advance very much

tomp1993 · January 15, 2018, 10:14

Hi McAero,
Whilst i am not aware of any specific objective function for CSfx, CSfy etc; a very good place to start would be running the navier-stokes 2D aerofoil optimization testcases included with SU2, since these viscous cases will take into account skin friction drag.
you could even compare the results of an Euler (inviscid) and navier-stokes (viscous) optimization with DRAG (CD) as your objective function to investigate the effects of viscosity on the optimization.
However, if you want to optimize for CSf only, you will want to start looking at the open-source code to identify where objective functions are specified. then it should be not too difficult to introduce your own objective function.
Tom

December 10, 2017, 17:11	How to make skin friction drag optimization	#1
McAero Member MM Join Date: Aug 2017 Posts: 30 Rep Power: 9	Hello all, I hope someone can help me How can I make skin friction optimization for a 2D airfoil? I wanna select the optimum chord, angles, and radii of the geometry of the airfoil? Also, if someone has explanation for the terms in the optimization cfg files maybe it help me understand Thanks in advance very much

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January 15, 2018, 10:14		#2
tomp1993 Member tom pratt Join Date: Jan 2016 Posts: 55 Rep Power: 10	Hi McAero, Whilst i am not aware of any specific objective function for CSfx, CSfy etc; a very good place to start would be running the navier-stokes 2D aerofoil optimization testcases included with SU2, since these viscous cases will take into account skin friction drag. you could even compare the results of an Euler (inviscid) and navier-stokes (viscous) optimization with DRAG (CD) as your objective function to investigate the effects of viscosity on the optimization. However, if you want to optimize for CSf only, you will want to start looking at the open-source code to identify where objective functions are specified. then it should be not too difficult to introduce your own objective function. Tom