# Help for setting 3D boundary condition in compressing water vapor

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 September 27, 2009, 15:05 Help for setting 3D boundary condition in compressing water vapor #1 New Member   golf Join Date: Jul 2009 Posts: 2 Rep Power: 0 Sponsored Links Dear all here, I am a beginner to simulate 3D single stage axial compressor compressing water vapor under vacuum but got some difficulties with the boundary condition setting. Known values I have are, compressor inlet total pressure (970Pa), mass flow rate, inlet total temperature and compressor's geometric size, blade rotating rpm. What I want to calculate out is, outlet total pressure, temperature. When I am using Fluent for the calculation, I have some points not clear: 1) should I set operating pressure to be 0? I understand the absolute pressure would be added based on this operating pressure and if I put 0 in operating pressure but put gauge pressure in inlet gauge pressure, it should be fine, am my understanding right? 2) I set inlet as mass flow rate, according to my understand to gauge pressure, I put the total inlet pressure value into initial gauge pressure, is it right? 3) I am not sure how to set up outlet, outlet pressure might be right choice, but I have little idea what I should do with the gauge pressure, should it be the static pressure as the same value as inlet? 4) To make pressure convergence, should I set pressure desensitization as standard mode? Could some one here give me some advise? that would be highly appreciated. BTW, the flow would be sub-sonic. Thanks advance. Last edited by sogolf; September 27, 2009 at 21:54.

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