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default values of kOmega (Wilcox) different from paper |
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July 26, 2011, 10:04 |
default values of kOmega (Wilcox) different from paper
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#1 |
Senior Member
Roman Thiele
Join Date: Aug 2009
Location: Eindhoven, NL
Posts: 374
Rep Power: 21 |
Hej,
does anyone know why the default values for the k omega model by Wilcox from 1988, which is implemented into OpenFOAM are different from the ones that the paper suggests. alpha = 5/9 in the paper but 13/25 in OpenFOAM (it is also 13/25 in the 2006 version of the model, which adds a cross diffusion term and a stress delimiter) beta = 3/40=0.075 in the paper, but 0.072 in OpenFOAM (in the 2006 model, this term is modelled by the stress delimiter modification). The paper is http://adsabs.harvard.edu/abs/1988AIAAJ..26.1299W
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August 2, 2011, 12:39 |
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#2 |
Senior Member
Dave
Join Date: Jul 2010
Posts: 100
Rep Power: 16 |
roman,
The beta of 0.072 is equivalent to the beta0 of the 1998 version of k-w on the NASA langley turbulence page for k-w: http://turbmodels.larc.nasa.gov/wilcox.html . This beta0 term is then multiplied by (1+70*chiomega)/(1+80*chiomega) to form beta. Note that term differs from the 2006 version as well. I have not looked at the code for the k-w model in OpenFOAM to see which formulation has been implemented but both of those cofficients match those of the 98' formulation. Regards, Dave |
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August 3, 2011, 07:43 |
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#3 | |
Senior Member
Roman Thiele
Join Date: Aug 2009
Location: Eindhoven, NL
Posts: 374
Rep Power: 21 |
Quote:
Thank you, I think I will check with the NASA website and see if the terms correspond to the model as well.
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komega, turbulence modelling |
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