Shock-absorber model

Clara

Hi folks, how can I model a shock-absorber in fluent? I suppose I have to prepare 2 different meshes, one for the cylinder and one for the piston. Then merge themselves and let one move.

But:

1)I don't know how to seal the shok-absorber;

2)I don't know how to represent adiabatic force due to gas present in the bottom of the piston;

3)I don't know how to let move each part.

Please, has anyone an idea? I'm not very good in Fluent.

Thanks, Clara.