Thermal expansion of a liquid

Hi all,

I’m am trying to produce a model of a fluid enclosed on all sides except one by fixed constraints(walls), on the remaining face a thin diaphragm is in contact with the fluid. As such this is a closed system with no flow.

I would like to model the deflection and stress of the diaphragm wrt the temperature of the enclosed fluid. Clearly as temp increases thermal expansion will deform the diaphragm

I have tried to model the situation using the fluid-structure interface option on 4.2 however I can’t find a tutorial that features a stationary fluid?

Which interface should I be using?

Any help would be greatly appreciated!

Thanks,
Matt