[123123alvaro]

Hi,

When you do a LES simulation, you should check the turbulent kinetic energy modeled and solved. How can we get a contour about this in ansys fluent workbench? Or how can we calculate this parameters?

Thanks!

[lei]

Hello, yes you can calculate the turbulent kinetic energy in a post-processing way for LES simulations.
The turbulent kinetic energy is defined as the mean kinetic energy per unit mass associated with the unsteadiness, you can use the following equation (half the sum of the variances (square of standard deviations) of the velocity components):

The time varying average and root-mean-square velocity fluctuations can be obtained from statistic results of your LES simulation. Then you can define this customer variable either in FLUENT or CFDpost to plot a contour.
Hope this helps.

[123123alvaro]

Originally Posted by lei

Hello, yes you can calculate the turbulent kinetic energy in a post-processing way for LES simulations.
The turbulent kinetic energy is defined as the mean kinetic energy per unit mass associated with the unsteadiness, you can use the following equation (half the sum of the variances (square of standard deviations) of the velocity components):

The time varying average and root-mean-square velocity fluctuations can be obtained from statistic results of your LES simulation. Then you can define this customer variable either in FLUENT or CFDpost to plot a contour.
Hope this helps.

Ok, thank you. But.. How can I differentiate the turbulent kinetic energy that has been calculated from the one that has been modeled in the simulation?I'm sorry, this is the first time I've done a LES simulation and I'm lost

[lei]

You are welcome. Unlike the RANS simulations where kinetic energy is modeled in a transport equation, in LES the velocities are directly resolved along with time, so there is no turbulent kinetic energy variable in the model like in RANS simulations. You have to calculate the TKE by yourself using the statistic results.