Coefficienct in the oodles

loneboard · February 12, 2009, 05:31

Now I start to try to use oodles to solve the flow in a constricted tube.

But in fact, I don't know the meaning of the coefficients in the folder of 0. what is the meaning of B,nuSgs, nuTilda? who would like to tell me?

I also don't know the meaning of the coefficients in the file of LESProperties?

Who could tell me how I could know it?

su_junwei · February 12, 2009, 17:53

Hi Xiaoguang

B is sub-grid stress tensor
nuSgs is sub-grid viscosity
NuTilda is kinematic turbulent viscosity

The coefficients are model-dependent

See the model implementation of sgs model in

/home/sujunwei/OpenFOAM/OpenFOAM-1.5.x/src/turbulenceModels/LES/incompressible/

Su Junwei

loneboard · February 13, 2009, 02:58

Thanks for your response. I will check it.

loneboard · February 13, 2009, 03:29

Thanks for your response. I will check it. In addition, for the treatment of flow near the wall, do I need to handle it additionally? Does it include in the sgs model?

lakeat · March 12, 2009, 21:18

It depends. Try to start from channelOodles, pay attention to LESproperties file, there near wall treatment is specfied.

Anyway, it is also model-dependent.

February 12, 2009, 05:31	Now I start to try to use oodl	#1
loneboard New Member xinguang cui Join Date: Mar 2009 Location: Heidelberg, Germany Posts: 9 Rep Power: 17	Now I start to try to use oodles to solve the flow in a constricted tube. But in fact, I don't know the meaning of the coefficients in the folder of 0. what is the meaning of B,nuSgs, nuTilda? who would like to tell me? I also don't know the meaning of the coefficients in the file of LESProperties? Who could tell me how I could know it?

February 12, 2009, 17:53	Hi Xiaoguang B is sub-g	#2
su_junwei Senior Member su junwei Join Date: Mar 2009 Location: Xi'an China Posts: 151 Rep Power: 20	Hi Xiaoguang B is sub-grid stress tensor nuSgs is sub-grid viscosity NuTilda is kinematic turbulent viscosity The coefficients are model-dependent See the model implementation of sgs model in /home/sujunwei/OpenFOAM/OpenFOAM-1.5.x/src/turbulenceModels/LES/incompressible/ Su Junwei

February 13, 2009, 02:58	Thanks for your response. I wi	#3
loneboard New Member xinguang cui Join Date: Mar 2009 Location: Heidelberg, Germany Posts: 9 Rep Power: 17	Thanks for your response. I will check it.

February 13, 2009, 03:29	Thanks for your response. I wi	#4
loneboard New Member xinguang cui Join Date: Mar 2009 Location: Heidelberg, Germany Posts: 9 Rep Power: 17	Thanks for your response. I will check it. In addition, for the treatment of flow near the wall, do I need to handle it additionally? Does it include in the sgs model?

March 12, 2009, 21:18	It depends. Try to start from	#5
lakeat Senior Member Daniel WEI (老魏) Join Date: Mar 2009 Location: Beijing, China Posts: 689 Blog Entries: 9 Rep Power: 21	It depends. Try to start from channelOodles, pay attention to LESproperties file, there near wall treatment is specfied. Anyway, it is also model-dependent. __________________ ~ Daniel WEI ------------- Boeing Research & Technology - China Beijing, China Email

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