CFD Online Logo CFD Online URL
Home > Forums > Main CFD Forum

Turbulent kinetic Energy

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

LinkBack Thread Tools Display Modes
Old   December 4, 2013, 20:32
Default Turbulent kinetic Energy
New Member
Join Date: Dec 2013
Posts: 2
Rep Power: 0
Cfd00d is on a distinguished road

I have a 3x3x3 mesh grid (chosen for simplicity) that I am using to analyze turbulent velocities. The turbulence is isotropic.

I have u-velocity measurements (fluctuations) made on the grid that were taken at some time, t. I also have v and w velocities that are the same size.

I would like to find the turbulent kinetic energy by using the equation \frac{1}{2} (u ^{2}_{ii})

What I am stuck on is understanding how to apply this equation to my data.

In example, if I wanted to plot TKE vs. t, I should only get a single point, right?

How do I boil down this data to get the single point?

Any help is appreciated.
Cfd00d is offline   Reply With Quote

Old   December 5, 2013, 11:45
Senior Member
Pete Bachant
Join Date: Jun 2012
Location: NH, USA
Posts: 111
Rep Power: 5
pbachant is on a distinguished road
You could pick a point and look at the turbulence kinetic energy over time. You could also average over the volume.

If your data is a sequence of 3D velocity fluctuation arrays, you can create a new k array by
\frac{1}{2}\left( u'^2 + v'^2 + w'^2 \right),
or squaring each element of the velocity fluctuation arrays and adding the arrays for each component to each other. If you have arrays of the total velocity, you will need to compute the time average for each point and subtract.
pbachant is offline   Reply With Quote

Old   December 5, 2013, 16:30
New Member
Join Date: Dec 2013
Posts: 2
Rep Power: 0
Cfd00d is on a distinguished road
Thank you for your reply pbachant
Cfd00d is offline   Reply With Quote


isotropic, meshgrid, turbulence kinetic energy

Thread Tools
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 On
Pingbacks are On
Refbacks are On

Similar Threads
Thread Thread Starter Forum Replies Last Post
question about turbulent kinetic energy junker4236 Main CFD Forum 9 July 27, 2015 14:58
Turbulent kinetic energy in k-epsilon model khunyeu FLUENT 0 October 7, 2013 01:31
LES and total turbulent kinetic energy Boerge FLUENT 1 September 8, 2012 11:41
LES of periodic pipe centerline turbulent kinetic energy smehdi609 OpenFOAM 0 December 1, 2010 00:59
what's the macro of SGS turbulent kinetic energy? lcw FLUENT 1 June 13, 2006 03:08

All times are GMT -4. The time now is 13:11.