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[JD_JN]

It seems like your road block is initializing the system. If the multi-phase model you have chosen does not allow patching of different fluids in one zone (seems strange), then I suggest trying:-build the domain with separate zones for the two fluids.In the gap between the diaphragm and the top/bottom walls, place a 0 thickness wallInitialize the separate zones with the two fluidsRemove the 0 thickness walls separating the two fluids Removing these separating walls by turning them into the “interface” type, or even use the “merge zones” command. I have not tried this myself. https://forum.ansys.com/discussion/comment/103051#Comment_103051

@YasserSelima, Yes, you are correct. The diaphragm moves as a rigid body in the deforming zone, and there is no solving of mechanics.nI built the diaphragm as a gap between the 2 dynamic zones initially, and it gets read just fine in FLUENT. But when I tried to do what @danbence, has suggested here, I'm getting the diaphragm being read as separate parts in FLUENT.nSpecifically, it happens when I try to do point #2 here in this comment : 'In the gap between the diaphragm and the top/bottom walls, place a 0 thickness wall'.nMaybe I'll try running a simulation anyway, defining all those separated parts as rigid bodies undergoing the same motion.n