Turbulence Modells - Overview

bastil · June 21, 2009, 02:59

Dear FOAMers,

I am currently doing some turbulence modeling benchmark. I miss some overview list about turbulence models in the documentation as it has been availabele in former releases I think.
Looking at the source code I see there is a kOmega SST model (I think it came with 1.4.1) but I don't know if this is a high-reynolds (wall-function) or a low-reynolds implementation? Are there some documents about that?

Thanks BastiL

paulo · June 22, 2009, 11:33

Hi BastiL,

You can find some discussion on this topic here:

http://www.cfd-online.com/Forums/ope...-overview.html

Best Regards,

Paulo Rocha

bastil · June 22, 2009, 15:48

Thanks paulo - however the link is linking to this thread?

Regards BastiL

paulo · June 23, 2009, 07:55

Hi BastiL,

I hope this link is correct:

http://www.cfd-online.com/Forums/ope...tallmaras.html

Sorry again.

Best Regards,

Paulo Rocha

Jade M · April 19, 2010, 17:18

For accurate boundary layer predictions, such as separation prediction, then the SST model should be used with y+<2. In this case, the SST model switches to a low-Re formulation near the wall rather than the wall function formulation. SST still works with 11<y+<300, but the results will be fairly similar to the k-e model since wall functions are used. For 2<y+<11, SST blends wall functions and low-Re formulations. In some situations, such as when needing accurate boundary layer heat transfer predictions or when using the transition model, an even lower y+ of about 1 is recommended with the SST model.

June 21, 2009, 02:59	Turbulence Modells - Overview	#1
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Dear FOAMers, I am currently doing some turbulence modeling benchmark. I miss some overview list about turbulence models in the documentation as it has been availabele in former releases I think. Looking at the source code I see there is a kOmega SST model (I think it came with 1.4.1) but I don't know if this is a high-reynolds (wall-function) or a low-reynolds implementation? Are there some documents about that? Thanks BastiL

June 23, 2009, 07:55	I'm sorry	#4
paulo Member Paulo Alexandre Costa Rocha Join Date: Mar 2009 Posts: 71 Rep Power: 17	Hi BastiL, I hope this link is correct: http://www.cfd-online.com/Forums/ope...tallmaras.html Sorry again. Best Regards, Paulo Rocha

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June 22, 2009, 11:33		#2
paulo Member Paulo Alexandre Costa Rocha Join Date: Mar 2009 Posts: 71 Rep Power: 17	Hi BastiL, You can find some discussion on this topic here: http://www.cfd-online.com/Forums/ope...-overview.html Best Regards, Paulo Rocha

June 22, 2009, 15:48		#3
bastil Senior Member BastiL Join Date: Mar 2009 Posts: 530 Rep Power: 20	Thanks paulo - however the link is linking to this thread? Regards BastiL

April 19, 2010, 17:18		#5
Jade M Senior Member Join Date: Feb 2010 Posts: 148 Rep Power: 17	For accurate boundary layer predictions, such as separation prediction, then the SST model should be used with y+<2. In this case, the SST model switches to a low-Re formulation near the wall rather than the wall function formulation. SST still works with 11<y+<300, but the results will be fairly similar to the k-e model since wall functions are used. For 2<y+<11, SST blends wall functions and low-Re formulations. In some situations, such as when needing accurate boundary layer heat transfer predictions or when using the transition model, an even lower y+ of about 1 is recommended with the SST model.