[Whitworth]

I'm starting to build a model of a piston (say 45mm diameter, 20mm length) in a sealed cylinder of air (50mm diameter 100mm length). This piston moves up and down (+ and minus y) with a sinusoidal velocity.

At the top of the cylinder there is a constant temperature of say 100 degrees centigrade and at the bottom 25 degrees centigrade. As the piston moves downward, the air is forced to the top of the cylinder, heating up and as the piston moves back upward, the air moves back down to the bottom.

My question is, how would I start to go about modeling this in fluent? I've never modelled something with motion before and a tutorial would be great. The setup in my head would be...

-geometry,cylinder of fluid constructed with a missing pocket 45mmx20mm, representing the piston.
-energy equation enabled so heat transfer was active
-no initial fluid velocity (piston would be at bottom dead center)
-top and bottom zones set at constant temperature
-cylinder wall set to 0 heat flux
-viscous model selected depending on approx reynolds number

But where might I find the options to translate the pocket in the continuum?

Thanks in advance

[Far]

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