Problem with supersonic flow
Hello together,
i´ve got a problem with the Fluent solver that don`t converg. I´am simulating a radial turbine blade and want to show the pressure field with the shock waves. I tried the following: - different mesh to exclude that the error is caused by the mesh - reduced courant number (0.1 ; 0.01 etc.) - solution steering with supersonic flow in the "run calculation" settings - velocity inlet instead of pressure far field in the boundary conditions - w-cycle, v-cycle, F-cycle in the "advanced solution controls" I always used the density based solver. Inviscid and energy equation is enabled. Does anyone have an idea of how I can make the solver converge? Kind regards |
Does no one have an Idea?
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What are the boundary conditions that you specify? How is your domain shaped?
Also, but this is just my curiosity, why have you chosen euler solver? Rob |
I used the euler equation after I have used the k-epsilon. I just wanted to simplifie the problem as a test because the solver didn't converge with turbulence model.
I mesh the geometrie with triangle or submap in Gambit. Boundaries are: INLET (pressure far field) - Mach 1.9 - 140000 Pa absolute OUTLET (pressure outlet) - 20000 Pa absolut After 3 days of try and fail I got greate improvements with the hybrid initialization (first I always tried standard initialization) |
Why do you initialize the inlet as a pressure far field? I would try with pressure inlet.
Instead of using the hybrid initialization try to initialize the problem using fmg initialization (in the Fluent console you can find it under 'solve/initialize/FMG initialization'). Hope it helps, Rob |
Dear Rob,
thanks a lot for your reply. I´ll try out your suggestions. Concerning pressure far field: I found a tutorial in wich they used the pressure far field. So that´s why I used it too :) |
Pretty curious, but it depends also on how is geometrically designed your domain.
Let me know if it works, normally FMG initialization solved many of my divergence problems. |
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