Outlet boundary condition for compressible nozzle flows
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Hello everyone,
I am currently trying to simulate a nozzle with an exit section (see attached figure). The configuration is very simple, it's a nozzle with a convergent then a constant section barrel then it exits the barrel. After that, there is a large empty zone where the jet exits before leaving with the outlet boundary. I have been trying to solve the flow with both pisoCentralFoam and sonicFoam, but to no avail. At the inlet I impose pressure boundary condition with zeroGradient for the velocity. Pressure boundary is 1.4 MPA. The bottom is a symmetry boundary condition. At the non-reflective outlet I impose waveTransmissive boundary conditions for the pressure. For example : Code:
outlet Anyway, I get decent results within the nozzle, however, the pressure profile and velocity profile outside the nozzle are very poor. There is a pressure accumulation at the bottom right corner of the simulation, and therefore a large velocity appears going upward very close to the outlet boundary. I have tried many alternative, but I cannot find a solution to my issue. I was wondering if any of you had any idea? I am sure it is relative somehow to my outlet boundary conditions, but I don't know. My only leftover option right now is that I think that maybe the symmetry boundary condition at the bottom is too much of a large constraint and this is what makes the upward velocity appear, but this is really all I have. Thanks! BB |
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