Help ! Create surface for sliding mesh.

YH Tan

I currently working on a 2 stroke engine model which involve moving piston pass the transfer and exhaust port.

I tried to create a surface as interface so that i can have sliding mesh when the piston move up and close the exhaust port slowly.

I having trouble on making this interface cause gambit no letting me to link the mesh on 2 different fluid zone.

i not sure what is needed to link 2 mesh zone.

is that anybody can teach me how to do it?

if possible, please teach me how to create sliding mesh surface.

Thanks a lot!!