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August 8, 2005, 09:45 |
Kolmogorov scale .... LES
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#1 |
Guest
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Hello,
I am doing some LES of a reacting flow and I need to calculate some values. How can I calculate the Kolmogorov timescale and the Kolmogorov Reynolds Number? Also how can I calculate the dissipation rate (epsilon)? Thanking you all. |
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August 12, 2005, 01:01 |
Re: Kolmogorov scale .... LES
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#2 |
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I guess you need read a textbook. Select large scales, estimate the dissipation scales by using the Komogorov relations and then estimate epsilon.
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July 2, 2015, 20:48 |
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#3 |
Member
Join Date: May 2013
Posts: 32
Rep Power: 13 |
Hello LESer,
Did you find how to calculate kolmogorov length scale in LES? I really appreciate if you could give me some help on this. Thanks, |
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July 3, 2015, 04:38 |
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#4 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73 |
there is no Kolmogorov scale in LES ! the smallest scale is defined by the filter lenght, not by the molecular viscosity and lies in the inertial subrange.
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July 3, 2015, 06:36 |
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#5 |
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Join Date: May 2013
Posts: 32
Rep Power: 13 |
FMDenaro thank you very much for your reply. Can you tell me a way to calculate this smallest length scale? I just need a way to calculate something similar to kolmogorov length scale? Can I write a user defined function for kolmogorov length scale maybe? If you could give me some help on this I really appreciate it.
Thank you very much |
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July 3, 2015, 06:54 |
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#6 |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,882
Rep Power: 73 |
Kolmogorov scale is dictated by the physics of the problem.
LES provides the smallest scale at about twice grid step size. That has nothing to do with kolmogorov scale |
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July 3, 2015, 07:01 |
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#7 |
Member
Join Date: May 2013
Posts: 32
Rep Power: 13 |
FMDenaro, thank you very much for your reply. Is there any way I can calculate and see that smallest scale in Fluent? I really appreciate your help. I just need to calculate something corresponding to kolmogorov length scale in LES. Thanks a lot.
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