[cfdjetman]

I am trying to optimize the NACA 0012 airfoil (2D) in SU2 6.2 using FFD control points.



I only simulate half plane as the angle of attack is 0 degrees. I have set up the FFD box as follows


FFD_DEFINITION= (FOIL,-0.04, 0, 0, 1.04, 0, 0, 1.04, 0.075, 0, -0.04, 0.075, 0, 0, 0, 0 ,0, 0, 0, 0, 0, 0, 0, 0, 0)


The FFD_DEGREE= (7, 1, 0)



I then set DV_KIND= FFD_SETTING and generate the mesh along with the FFD box using SU2_DEF naca0012.cfg.


I use only the upper control points as design variables.
DEFINITION_DV= ( 15, 1.0 | AIRFOIL | FOIL, 0, 1, 0.0, 1.0 );( 15, 1.0 | AIRFOIL | FOIL, 1, 1, 0.0, 1.0 );( 15, 1.0 | AIRFOIL | FOIL, 2, 1, 0.0, 1.0 );( 15, 1.0 | AIRFOIL | FOIL, 3, 1, 0.0, 1.0 );( 15, 1.0 | AIRFOIL | FOIL, 4, 1, 0.0, 1.0 );( 15, 1.0 | AIRFOIL | FOIL, 5, 1, 0.0, 1.0 );( 15, 1.0 | AIRFOIL | FOIL, 6, 1, 0.0, 1.0 );( 15, 1.0 | AIRFOIL | FOIL, 7, 1, 0.0, 1.0 )


Note, I am using FFD_CONTROL_POINT_2D as my design variables during my optimization process. I change DV_KIND=FFD_CONTROL_POINT_2D before running the optimizer.



I then set OPT_RELAX_FACTOR= 1E3

and OPT_BOUND_UPPER= 1E4
and OPT_BOUND_LOWER= 75


So when I start my optimizer, it shows

Lower and upper bound for each independent variable: [(0.075, 10.0), (0.075, 10.0), (0.075, 10.0), (0.075, 10.0), (0.075, 10.0), (0.075, 10.0), (0.075, 10.0), (0.075, 10.0)]


The lower bound corresponds to the current location of the design variables, I have selected. This is because, I want my design variables to only move in the positive Y direction from its current location. However, during the optimization process, this lower bounds is violated by some of the design variables.



What am I doing wrong? Is there something wrong with my setting? I haven't scaled my OPT_OBJECTIVE= DRAG function. Would this help?


Also, how do I view the design variables in tecplot?