mesh resolution for DNS with high prandtl number
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.
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
I think I remember from University that the resolution should be the kolmogorov length.
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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