Solid Fluid Interface boundary problems
 

Hi all

I have a small solid cylinder in the middle of my domain which is a larger cylinder and the fluid is air. I meshed the small solid cylinder's faces first, then meshed its volume and then used a size function from the faces of the cylinder to the volume of the domain to grow out cells from the solid cylinder face outwards. Does this method sound right?

My other question is regarding the boundary condition for this case. Do I specify the faces of the small solid cylinder as WALL or do I specify them as INTERFACE or both? What are the other details to be taken care of when I import the mesh into FLUENT?

Thanks

Prashanth