[rgbatista]

Dear someone who might be able to help,


For my master's thesis, I am working on the optimization of a benchmark case from the ADODG group. The objective is to minimize drag (Cd) in a transonic flow over the NACA0012 airfoil. The only restriction is y_optimized_airfoil > y_baseline at each point on the airfoil's surface. However, I have encountered challenges as I am unable to optimize this case, and Cd does not decrease.


I have attempted various approaches, including FFD Set Box with different numbers of design variables (DVs), adjusting upper and lower bounds, imposing a scale of 0.001 in the restrictions and optimal_objective, and applying the Hick-Hennes geometric parameterization method. Unfortunately, in most cases, Cd fails to decrease and the imposed restriction is not met.


Interestingly, when working on another case from the ADODG group—drag minimization on a viscous transonic flow over RAE 2822—I achieved improvement, reducing drag counts from 190 to 126 using the FFD-setting box option and meeting all associated restrictions (Cl=0.824, Cm >=-0.092, and A_optimized >= Area_baseline).


I am perplexed about why the NACA 0012 case is not showing improvement. Is there something crucial that I might be overlooking? I will provide a link with the documents for both cases, including .cfg files, .su2 meshes, and PDFs with the benchmark case restrictions.


The link: https://unlpt-my.sharepoint.com/:f:/...UtGrT4DchRJjHQ



https://unlpt-my.sharepoint.com/:f:/...UtGrT4DchRJjHQ


If someone could offer insights or assistance, I would be extremely grateful!


Best Regards,
Rafael Batista