CFD Online Logo CFD Online URL
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Verification & Validation

Large eddy simulation of a turbulent plume in stratified medium

Register Blogs Members List Search Today's Posts Mark Forums Read

LinkBack Thread Tools Search this Thread Display Modes
Old   June 29, 2021, 13:55
Default Numerical simulation of a turbulent plume
New Member
Join Date: Apr 2018
Posts: 3
Rep Power: 6
nitinkumar@cfd is on a distinguished road
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.
Attached Images
File Type: png K_comp_LES.PNG (28.6 KB, 35 views)
File Type: png w_LES_comp.PNG (28.7 KB, 37 views)

Last edited by nitinkumar@cfd; July 2, 2021 at 00:21.
nitinkumar@cfd is offline   Reply With Quote

Old   September 6, 2021, 11:35
Senior Member
Join Date: Apr 2020
Location: UK
Posts: 455
Rep Power: 11
Tobermory will become famous soon enough
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?
Tobermory is offline   Reply With Quote


les simulation, openfoam, plume entrainment, thermal plume, turbulence

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
Large Eddy Simulation Nijanthan FLUENT 14 May 3, 2021 15:32
Large Eddy Simulation (LES) of Tunnel Pool Fire and calculation Infra Red absorption Avr.Tomer Main CFD Forum 2 May 4, 2020 13:00
Implicit Large Eddy Simulation Implementation eddykendo OpenFOAM Programming & Development 0 March 24, 2016 02:34
Large eddy simulation jii1 FLUENT 0 May 11, 2010 14:23
Large Eddy simulation Andreas Hauser Main CFD Forum 1 May 20, 2000 20:33

All times are GMT -4. The time now is 22:41.