CFD Online Discussion Forums

CFD Online Discussion Forums (http://www.cfd-online.com/Forums/)
-   OpenFOAM Running, Solving & CFD (http://www.cfd-online.com/Forums/openfoam-solving/)
-   -   Buoyancy boundary conditions (http://www.cfd-online.com/Forums/openfoam-solving/59567-buoyancy-boundary-conditions.html)

ogloth July 16, 2007 15:01

Hello, Is there somebody wh
 
Hello,

Is there somebody who could explain the implemented boundary conditions for buoyant flow to me?

I would like to compute flow through a channel or tube (buoyantFoam or buoyantSimpleFoam) and I am not quite sure which boundary conditions are appropriate.

What exactly does fixedFluxBuoyantPressure do? I assume it would extrapolate the pressure from the field to the boundary - taking into account the gradient due to gravity. Is this correct? What exactly is the value that has to be specified?

For inlet and outlet conditions conditions I am a bit stuck on what to use. My experiments so far ended in either a blow-up or completely useless results.

Any help would be really appreciated.

Thanks,
Oliver

sharonyue November 25, 2012 08:49

Quote:

Originally Posted by ogloth (Post 200766)
Hello,

Is there somebody who could explain the implemented boundary conditions for buoyant flow to me?

I would like to compute flow through a channel or tube (buoyantFoam or buoyantSimpleFoam) and I am not quite sure which boundary conditions are appropriate.

What exactly does fixedFluxBuoyantPressure do? I assume it would extrapolate the pressure from the field to the boundary - taking into account the gradient due to gravity. Is this correct? What exactly is the value that has to be specified?

For inlet and outlet conditions conditions I am a bit stuck on what to use. My experiments so far ended in either a blow-up or completely useless results.

Any help would be really appreciated.

Thanks,
Oliver

Hi,
I dont know the mean buoyantpressure and fixedFluxBuoyantPressure either, did you figure it out?


All times are GMT -4. The time now is 09:45.