Questions Regarding the Objective Function Setting in daOptions

[cfddinner]

Hello everyone,
Recently, while using DAFoam, I've noticed that setting either the drag force value or the drag coefficient as the objective function leads to different optimization processes but results in nearly the same results. Additionally, using drag as objective function makes the calculation converge more quickly than using CD. Is this normal behavior?
Thank you all, and wish you all the best.

[friedenhe]

Yes, this is expected because you are using different scales for the objective function. It will impact the convergence of the optimization. But if both of them converge well, they should converge to the same solution, no matter whether CD or D is used.

[cfddinner]

Thank you for your reply! What you said makes perfect sense, and my calculation results also show the same thing.