Hi,

I am a university student currently completing some simulations on TPMS (triply periodic minimal surface) as heat exchangers. I have generated a structure in spaceclaim, with wall boundaries and an open inlet and outlet, which i have named as faces. I then save and convert to pmdb and open in fluent mesher. I have applied some local sizing to the solid TPMS structure and then applied shared topology to this solid structure. The issue arises when trying to enclose and create regions.

I stated in the describe geometry tab it would be only a solid, and that i would cap openings and extract the fluid. However when i select the create regions tab and input 2, it only ever creates 1. The single fluid that is created appears exactly as it should, but im at a bit of a loss as to why the second is not appearing. For context, there is no interface or contact between these two fluids, they are separated by the solid TPMS structure to act as an indirect heat exchanger. 

Any help/advice/directions to tutorials would be greatly appreciated. I have provided some images below to hopefully make it easier to understand what the structure and the single fluid domain looks like. 

Thanks in advance!

Solid TPMS structure with surrounding walls ^

one of the desired fluids created^