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Large eddy simulation of a turbulent plume in stratified medium |
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#1 |
New Member
NITIN KUMAR
Join Date: Apr 2018
Posts: 3
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Hi, Foamers, I am running a large eddy simulation of a turbulent plume in a density varying medium (stratified medium). I am comparing mean axial velocity with an experimental study. I found that qualitatively I m getting a good agreement. However quantitatively, There are differences that can be clearly seen in the velocity. I am trying to figure out why this difference or deviation is coming.
For details: I am using the dynamic k-equation model in OpenFOAM-5.0. I am using buoyantBoussinesqPimplefoam solver (which I modified for the stratified medium). Apart from that, the plume is a forced plume with initial buoyancy and momentum. I am using around 10 million cells for the computation. I have also plotted turbulent kinetic energy (LES) with the experimental value on the centerline. I observed that resolved Kinetic energy is more as compared to experiment, which quite strange. I am not able to figure out what is the issue. I WILL BE very grateful if any experienced user help. Also, I observed that the entrainment is less from the velocity contours. Last edited by nitinkumar@cfd; July 2, 2021 at 00:21. |
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#2 |
Senior Member
Join Date: Apr 2020
Location: UK
Posts: 711
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From your second chart, it looks like the entrainment rate is higher in your LES than in the experiment, which matches the observation that the TKE levels are higher.
I know that this is an old post, but did you find a cause for the difference? |
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Tags |
les simulation, openfoam, plume entrainment, thermal plume, turbulence |
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