My final proyect is about a shell and tube CFD. I need to obtain pressure drop and eficience results. My first task is develope the mesh. The hot fluid is gas and the coolant is water. I want to mesh the tubes too. I would like to receive some advices about the mesh. Boundary layer is a important point but i wouldnt like to increase too much number of cells. In Fluent...what turbulent model should i use? what about 1rs or 2nd order in discretization scheme? I have done some meshes and i get good results in pressure but results in temperature aren't good enough. Thanks in advance

Do not use tetrahedral mesh in fluent for dual heat transfer (sold/fluid) results are no good according to heat exchanger conference. Do not forget to take in account buoyancy.

B.L.

Thanks for your answer. My geometry is really complex. What about a layer of prims in the heat transfer surfaces? how can i take in account the buoyancy in fluent?(i'm novice ni Fluent). I had thought about make velocity & pressure gradient adaption.

Thanks in advance for your suggestions.

P.J.