I am confused when I define boundary conditions of a wall between two different solids. The thermal conditions listed are heat flux, temperature, convection, radition, and mixed. Since I do not know the heat flux through the wall, and the temperature is not fixed, the first two typies are not applicable. The later three typies are not suitable for two solids, I think.

Somebody help me.

Hi, Are you Chinese, I'm too. I think your problem can be solved in the GAMBIT. When you create the geometry model, create only one edge as the common wall between two solid zones(it's very important). When you define the thermal condition of that "two-side" wall, the thermal condition type is specified as "coupled" by default. Actually, you need input nothing. I hope it can give a hand. Sincerely, Harry Qiu.

You are right. I really appreciate your help.

Yes, I am Chinese.