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mesh resolution for DNS with high prandtl number |
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January 10, 2014, 11:14 |
mesh resolution for DNS with high prandtl number
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#1 |
Member
SAM
Join Date: Apr 2012
Posts: 74
Rep Power: 14 |
Dears
I am doing DNS with high prandtle number fluid (Pr=15). 1- Could someone tell me the best resolution for DNS. 2- For high Pr number I should go finer mesh, Could someone tell me what is the relation between Pr and factor of mesh resolution. Bests |
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January 10, 2014, 11:39 |
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#2 | |
Senior Member
Filippo Maria Denaro
Join Date: Jul 2010
Posts: 6,849
Rep Power: 73 |
Quote:
Just consider the Peclet number = Re*Pr in the energy equation as the same way as you consider only the Re number in the momentum |
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January 11, 2014, 00:40 |
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#3 |
Member
Join Date: Dec 2012
Posts: 92
Rep Power: 13 |
I think I remember from University that the resolution should be the kolmogorov length.
http://en.wikipedia.org/wiki/Kolmogorov_microscales It is not alway ease to find the right epsilon. You can try to estimate it due to Reynolds number and boundary condition or run a coarse grid simulation with k-e turbulence. How do you want to run a DNS anyway. I remember running some LES-code at University for several weeks on clusters (and DNS can be factors of magnitude more expensive). Anyway, good luck and fun |
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