Fluent Outflow boundary condition implemented in OF?
Hello FOAMers,
is there someone that knows if a BC similar to Fluent's outflow BC has already been implemented in OpenFOAM? Fluent's guide says that: Quote:
Can be ok setting U, k, epsilon as inletOutlet, inletValue $innerField and p as zeroGradient both at the inlet and at the outlet? Since U is directed to the external of the domain at the outlet, the inletOutlet BC will use U as zeroGradient, in such a way that both U and p are not fixed in that boundary. Thanks in advance for comments and suggestions! maddalena |
Hi maddalena!
if we consider the case of a flow over a wing within a square domain (boundaries: inlet, outlet, top, bottom) what I usually do, using the solver simpleFOAM, is to adopt the following settings: inlet: U (k,epsilon) inletOutlet, p zeroGradient outlet: U (k,epsilon) zeroGradient, p outletInlet top, bottom: U (k,epsilon) freestream, p freestreamPressure. if you want to avoid setting even the pressure at the outlet you can try simply changing the BC at the outlet from outletInlet to zeroGradient or freestreamPressure (actually the value is not needed in both). However I'm not sure the problem is well-posed in this way. Is the flow subsonic or supersonic?? let me know, dino |
Hi Dino,
The flow is subsonic, actually it is an incompressible flow. If I am right, freestream bc can be used on compressible flow only, thus that is not a possibility for me. That's why I chose inletOutlet everywhere. As for my case, I cannot set the pressure at the outlet, since I do not know what its value is. I am trying to reproduce results from a Fluent simulation, and they used an outflow bc at the outlet, thus that is why I asked such a question. Thanks for any suggestions you will give. Cheers, maddalena |
Hi Maddalena,
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I know this is a really old post, but by any chance did you finally find the solutions to this? I'm stuck in the same problem now. Thanks |
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