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Buoyancy boundary conditions

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Old   July 16, 2007, 15:01
Default Hello, Is there somebody wh
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Oliver Gloth
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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
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Old   November 25, 2012, 08:49
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Dongyue Li
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Quote:
Originally Posted by ogloth View Post
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?
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