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Standard k-epsilon based Nonequilibrium turbulent viscosity model

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Old   February 13, 2013, 03:23
Default Standard k-epsilon based Nonequilibrium turbulent viscosity model
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Nikesh Bhattarai
Join Date: Nov 2011
Location: Daejeon, South Korea
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nikesh is an unknown quantity at this point
I have been trying to implement a non equilibrium turbulent viscosity model (Akira Yoshizawa et al.) into OpenFOAM. The turbulence quantities (k and epsilon) are governed by the same equations of the standard k-epsilon model.

At the moment I am trying to validate my code for the case of a 2D flat plate turbulent boundary layer and compare the results I've obtained using LaunderSharmaKE model. I could obtain the results but they are not making sense to me. I have attached here the equations of the model and the code that I have used. I also have included the results.

I have as well made use of a low Reynolds-number corrections as proposed by Abe et al. I have included those equations too.

I would be really thankful if someone with insights in this field looked into it and shed me some light in this matter.

Thanks in advance!!
Nikesh.
Attached Images
File Type: jpg model eqns.jpg (23.9 KB, 15 views)
File Type: png low Re-correction.PNG (18.9 KB, 15 views)
Attached Files
File Type: c NonEquilibriumKE.C (7.9 KB, 2 views)
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Old   February 13, 2013, 03:53
Default Result files
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Nikesh Bhattarai
Join Date: Nov 2011
Location: Daejeon, South Korea
Posts: 70
Rep Power: 4
nikesh is an unknown quantity at this point
The result file is attached here.

What I have done here is that I have limited the blending functions.

1. min(fMu,1) and min(sqr(Rt), 50)
2. fMu-limited, Rt-not limited
3. fMu-not limited, Rt-limited
Attached Images
File Type: png k.PNG (20.1 KB, 12 views)
File Type: png epsilon.PNG (19.7 KB, 9 views)
File Type: png u-profile.PNG (15.0 KB, 8 views)
File Type: png uPlus-yPlus.PNG (21.8 KB, 12 views)
File Type: png nut.PNG (18.9 KB, 7 views)
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