Unrealistic flows in a natural ventilation model
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Hi all,
I have a natural ventilation model which comprises of a small simple room with a couple of heat sources inside and two sections on either side of the room acting as the external environment. I am using OpenFOAM v8 running buoyantSimpleFoam with RNG K-Epsilon. When I visualize the U field in paraview, the air flows seem to be flowing from the top atmospheric boundary down to the ground on both sides of the building. My initial guess is that I need some sort of coefficient to control how the internal pressure matches the set external pressure. I know Phoenics has a control where you can add either a linear or quadratic coefficient to acheive this control. Unfortunately I do not now how, providing I need to, acheive this in OpenFOAM. I have attached an image of the flows in paraview which hopefully shows the problem that I am trying to explain. I have also attached a compressed version of my model, if that is needed. I have seen the use of a p0 value in some of the p files and not sure if I should be using this. Hopefully someone will be able to help with this issue. Kind regards. Here is my p file: Code:
FoamFile |
By any chance does anyone know how to fix this issue and achieve more realistic flows using the RNG K-e model?
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Does anyone have any suggestions as to how to fix this model?
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Hi,
First thing I would try: use 2nd order schemes in fvSchemes instead of 1st order (upwind) For buoyant flows, using first order schemes can cause this kind of behavior. I hope this helps, Yann |
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