which mesh method should I use
 

Hi,

I just start to use FSI to simulate a project as the pic shows. Force will cause one face named diaphragm deflect and then make water inside flow. The other faces are all rigid walls.
Attachment 19013
Can anyone told me which kind of mesh method I should use to mesh the fluid part? Is there any dynamic meshing like FLUENT in CFX?

Thanks,
itsqi7