Problem with Turbulence Kinetic Energy

Davide_sd · August 24, 2013, 05:57

Thank you very much for these settings!!!

Can i ask you the settings you have used for the residuals?
I have set them up to 1e-10 and with k-epsilon model the simulation converges in 2300 iterations...

flotus1 · August 24, 2013, 06:07

I usually disable residual targets for such simple simulations and run the cases until the residuals level out.

shackman287 · August 7, 2014, 13:57

Is the below implementation equivalent to TKE = 1/2*[bar(u'u')+bar(v'v')+bar(w'w')]

0.5*magSqr(cmptAv(U-UMean))

It is not identical to the K I get from k-epsilon, but this a modelled term so I didn't know if they should be identical.

Any feedback is greatly appreciated or any suggestions as how to solve for the resolved TKE in LES models or URANS.

August 24, 2013, 06:07		#22
flotus1 Super Moderator Alex Join Date: Jun 2012 Location: Germany Posts: 3,426 Rep Power: 49	I usually disable residual targets for such simple simulations and run the cases until the residuals level out. Davide_sd likes this.

August 7, 2014, 13:57	Is this a correct implementation of resolve TKE	#23
shackman287 New Member Charlie Join Date: Aug 2010 Posts: 14 Rep Power: 16	Is the below implementation equivalent to TKE = 1/2[bar(u'u')+bar(v'v')+bar(w'w')] 0.5magSqr(cmptAv(U-UMean)) It is not identical to the K I get from k-epsilon, but this a modelled term so I didn't know if they should be identical. Any feedback is greatly appreciated or any suggestions as how to solve for the resolved TKE in LES models or URANS.

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August 24, 2013, 05:57		#21
Davide_sd Member Davide Join Date: Dec 2012 Posts: 33 Rep Power: 13	Thank you very much for these settings!!! Can i ask you the settings you have used for the residuals? I have set them up to 1e-10 and with k-epsilon model the simulation converges in 2300 iterations...