Minimizing force on a body

shsreekanth · June 13, 2014, 18:10

Hi,
In the case I am considering, I want to minimize the total force object by changing the position of the object. I am able to achieve minimization with respect to drag. I

1. In one of the previous threads , it was mentioned that , to minimize lift , I can set up the
OPT_OBJECTIVE = LIFT *-.001 . But this does not seem to work correctly. The lift computed in the function evaluation step after a gradient evaluation step moves in the direction of increasing lift. Moreover, the lift doesnt change from the initial state value. However, I have found that there is a location which gives near zero lift. Is there any other change I should make?

2. Is there anyway to give the resultant force as the objective?

Regards,
Sreekanth

fpalacios · June 26, 2014, 01:10

Maybe the adjoint equation is not converging properly, could you please send us the case that you want to optimize?

Cheers,
Francisco

June 13, 2014, 18:10	Minimizing force on a body	#1
shsreekanth Member Sreekanth Join Date: Jun 2013 Location: India Posts: 30 Rep Power: 13	Hi, In the case I am considering, I want to minimize the total force object by changing the position of the object. I am able to achieve minimization with respect to drag. I 1. In one of the previous threads , it was mentioned that , to minimize lift , I can set up the OPT_OBJECTIVE = LIFT *-.001 . But this does not seem to work correctly. The lift computed in the function evaluation step after a gradient evaluation step moves in the direction of increasing lift. Moreover, the lift doesnt change from the initial state value. However, I have found that there is a location which gives near zero lift. Is there any other change I should make? 2. Is there anyway to give the resultant force as the objective? Regards, Sreekanth

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June 26, 2014, 01:10		#2
fpalacios Super Moderator Francisco Palacios Join Date: Jan 2013 Location: Long Beach, CA Posts: 404 Rep Power: 15	Maybe the adjoint equation is not converging properly, could you please send us the case that you want to optimize? Cheers, Francisco