simpleFoam kOmegaSST k, w and nut initial and boundary values

Ezel Bayraktar · December 6, 2021, 02:22

Hello Everyone,

I am trying to simulate flow over an airfoil using simpleFoam and turbulence model kOmegaSST. I have taken k, w and nut values from http://ichrome.com/blogs/archives/342 and http://www.wolfdynamics.com/tools.html?id=110. But after several iterations, soltion diverges. After changing these values many times, I have obtained a stable solution. My question is; how could we select values of these turbulence parameters.

with all respect...
Ezel Bayraktar

Ryuzaki · December 6, 2021, 14:28

Hi Ezel, if you are sure that the turbulence coefficients you use are correct, you can try to reduce the relaxation factors to get stable results.

Eyşan Tezcan Atay

ErenC · December 6, 2021, 14:32

You need to share your log so people can see/understand whats happening. A simulation can diverge from hundreds of reasons.

Ezel Bayraktar · December 30, 2021, 08:08

Quote:

Originally Posted by Ryuzaki

Hi Ezel, if you are sure that the turbulence coefficients you use are correct, you can try to reduce the relaxation factors to get stable results.

Eyşan Tezcan Atay

Niye lan niye...

December 6, 2021, 02:22	simpleFoam kOmegaSST k, w and nut initial and boundary values	#1
Ezel Bayraktar New Member Ezel Bayraktar Join Date: Jul 2020 Posts: 4 Rep Power: 7	Hello Everyone, I am trying to simulate flow over an airfoil using simpleFoam and turbulence model kOmegaSST. I have taken k, w and nut values from http://ichrome.com/blogs/archives/342 and http://www.wolfdynamics.com/tools.html?id=110. But after several iterations, soltion diverges. After changing these values many times, I have obtained a stable solution. My question is; how could we select values of these turbulence parameters. with all respect... Ezel Bayraktar

December 6, 2021, 14:28		#2
Ryuzaki New Member Ali Can Join Date: Apr 2021 Posts: 28 Rep Power: 6	Hi Ezel, if you are sure that the turbulence coefficients you use are correct, you can try to reduce the relaxation factors to get stable results. Eyşan Tezcan Atay saidc. likes this.

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December 6, 2021, 14:32		#3
ErenC Member Eren Join Date: Aug 2018 Posts: 92 Rep Power: 10	You need to share your log so people can see/understand whats happening. A simulation can diverge from hundreds of reasons.