Hi Guys! i'm try to create a mesh of a 2d engine, in which i have a simple cylinder and a piston, so two surface. I manage to do the mesh only for cylinder, because next i will do a dynamic simultion. My problem is that i don't want to make another mesh for piston because this will be my moving front, but if i don't do this, ansys detect it as an error. So my question is: there is a way to go on without meshing a surface or i have to delete the piston surface and preserve only its boundaries as moving front?