Dear Fedrico, 

Thank you so much for your reply. I actually wanted to model conjugate heat transfer of a solid fluid domain. In my work, I actually created two solid body and 2 fluid body. solid body 2 and fluid body 1 is rotating at the same rotational speed and fluid body 1 has a inlet velocity. fluid body 3 and solid body 4 are stationary. I wanted to see the temperature raise due to viscous dissipation. I couldn't the solid body. I would appreciate if you could tell me how I can rotate the solid body. Thank you so much!