How to get the DISSIPATION in volume output

Amber0922 · October 19, 2023, 04:04

Dear all,

I want to get the TKE and DISSIPATION in volume output to estimate my mesh if works well in LES. I first use the SA model, but it doesn't output TKE and DISSIPATION directly, so I change the SST model, and run SU2_CFD -d <>.cfg to ensure the volume output obtain them.

BUT it only has TKE only, I didn't see the dissipation in it. So how can I get the dissipation distribution in my flow field?

Any help is necessary for me! Thanks for your patience.

Yours,
Zhang

bigfootedrockmidget · October 20, 2023, 05:39

The turbulence dissipation is called "Omega" in the k-omega model. And yes, the SA model cannot give you the tke and dissipation because they are not solved for. Instead, you have the turbulent viscosity Nu_t.

Amber0922 · October 20, 2023, 05:42

Thank you so much. You've been very helpfu

October 19, 2023, 04:04	How to get the DISSIPATION in volume output	#1
Amber0922 Member Zhang Join Date: Mar 2023 Posts: 72 Rep Power: 3	Dear all, I want to get the TKE and DISSIPATION in volume output to estimate my mesh if works well in LES. I first use the SA model, but it doesn't output TKE and DISSIPATION directly, so I change the SST model, and run SU2_CFD -d <>.cfg to ensure the volume output obtain them. BUT it only has TKE only, I didn't see the dissipation in it. So how can I get the dissipation distribution in my flow field? Any help is necessary for me! Thanks for your patience. Yours, Zhang

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October 20, 2023, 05:39		#2
bigfootedrockmidget Senior Member bigfoot Join Date: Dec 2011 Location: Netherlands Posts: 697 Rep Power: 21	The turbulence dissipation is called "Omega" in the k-omega model. And yes, the SA model cannot give you the tke and dissipation because they are not solved for. Instead, you have the turbulent viscosity Nu_t.

October 20, 2023, 05:42		#3
Amber0922 Member Zhang Join Date: Mar 2023 Posts: 72 Rep Power: 3	Thank you so much. You've been very helpfu