[@Arash]

Hi everyone,

I have a 3D flat plate. I am going to optimize it with Fluent's adjoint solver. During the optimization, as the geometry changes, the thickness decreases in some areas and increases in some areas. I have a design condition, and that is that the thickness of the geometry remains constant during optimization, and in fact, the upper and lower surfaces of the geometry are deformed at the same time, so that the distance between the two surfaces remains constant and unchanged.
I have already read all the design condition in the Design tool from the user guide, but I don't know exactly which one to use for my problem.

Can anyone help me ?
Thanks in advance.