Fluid moving between fluid bodies in 3d

[samiuusivirta]

Im a total beginner in ansys fluent and im simulating a stirling engine. You are looking at a cross section of the engine with the faces on front having a symmetry boundary condition. I have divided the fluid in the cylinder into 4 bodies (brown, blue, green, gray) so the meshes can shear with the others at right points. Right now im trying to make all the fluid regions connected in a way that fluid can move between the regions while keeping the meshes sliding between each other. How would i achieve that?

The highlighted green body is the outer fluid region in the cylinder that is in sliding contact with the upper and bottom fluid meshes.

Mesh deforming (displacer piston walls and power piston wall going up) with layering and smoothing enabled.

At the bottom and on top of the displacer piston wall and at the head of the power piston wall i have an assigned an UDF that moves the walls in sinusoidal motion.