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Solving complex geometry with compressible flow

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Old   April 7, 2017, 10:28
Default Solving complex geometry with compressible flow
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Gonzalo
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Hi all:
I have a problem simulating a complicated geometry with a complex flow inside it witn FLUENT. With complex I mean that it has a complicated path to follow and in some places i could be detached, so there could be some reversed flow. The inlet Mach N is 1.13 and I have a pressure outlet at the exit. My BC's area as follow: for inlet: Mass-flow-inlet, a total temperature and I set a static gauge pressure for the firs iteration, and for the outlet a static pressure . I'm using a Density based formulation, air as an ideal gas, SST-kw for turbulence, 2nd order for the spatial discretizacion, coupled solver with pseudo transient formulation. The problem is that in the inlet, the solution can't reach the specified Mach N and the convergence for the continuity is not as good as I wish (5e-2), and I don't know why. The other problem is that, the total mass balance is not accomplished, sometimes the outflow is 50% higher than the inlet. I can't understand this!!! I have some experience with fluent solving compressible flow but in non confined places, but in cases with confined compressible flow my experience is little. Can someone guide me on what I can do to solve this problem? Thanks in advance
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Old   May 19, 2017, 15:56
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Gonzalo
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Hello:
no one can help me with this? Thanks
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