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- - **Problems about buoyantBoussinesqSimpleFoam solver**
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Problems about buoyantBoussinesqSimpleFoam solverHi, dear foamers, I am trying to use the solver of buoyantBoussinesqSimpleFoam to calculate a simple case, however I am not sure about the boundary condition setting of p.
I consult the hotRoom case, and set it as follows. wall: type buoyantPressure; rho rhok; value uniform 0; inlet: zeroGradient; outlet: fixedValue; However, the calculation results are wrong. Any comments? Thank you in advance. Best regards, Chiven |

It seems OK, have a nice day, everyone.
with best regards, Chiven |

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Hi, Chiven, Are you doing heat transfer ? It seems that buoyantBoussinesqPisoFoam can't select LES turbulence model, it noly can use RAS model.Could you give me some suggestion what is the easise way to use LES buoyant model? |

Hi, Jiang, this time I am struggling for the multiphase flow.
What a pity I am not good at LES model. Maybe you need revise the code referencing to the solvers with LES model, like buoyantPisoFoam, etc. best regards, Chiven |

Thanks ,Chiven.
I think I should modify buoyantPisoFoam. |

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because my buoyantBoussinesqSimpleFoam result is completely wrong, could you tell me the best boundary conditon for p? |

try to use fixed value for outlet and buoyantPressure for wall.
best regards, chiven |

3 Attachment(s)
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I have used fixed value for outlet and buoyantPressure for wall, but my result is unphysical. I have struggling for buoyantBoussinesqSimpleFoam for a long time, and try a lot of boundary condition, but all the result is not right. I use version-1.6. I think this solver have some problem, If I should modify this solver ? The following is fluent and OpenFOAM result of U_X contour , the fluent result is right , but OpenFOAM can't get this contour. in OpenFOAM, the flow structure near outlet region always have problem. Thank you very much. |

Dear All,
I am fighting the same bull currently. It is the same case that panda60 asked for in other topic. What I am trying to simulate it is flap terrain with a obstacle in the middle of the domain. I impose a stable ABL with a T and U BC at inlet based on monin-obukov theory. For p and p_rgh I have imposed bouyantPressure in all patches and the ground wall. Could all of us summarize a set or procedure to simulate this kind of simulations? Best Regards |

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Did you get some advancement in your simulation? I'm trying to test the same case of yours, a flat terrain with an obstacle in the middle and a stable atmosphere. One huge doubt that I have is: How to set up a vertical gradient from the terrain to the top? Do I have to set it up on the BCs or on the internalField? Best regards |

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