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DNS and LES resolution

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Old   November 25, 2010, 18:10
Default DNS and LES resolution
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Thomas Larsen
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Hi everyone
I am a bit newbie on the LES and DNS subjects and I am wondering if someone can help me clear out a couple of question.

First:
The kolmogorov turbulence length scale for DNS after what i have learned the the basis for grid size? Is the Taylor length scale the correct basis for LES?

Second:
To clear it out. How many cells are needed to describe the motion for the smallest turbulence length?

Third:
What is the common way to determine cell size for LES computation? I am specially interested in a wing transition problem.

Thanks
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