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Analysis for cell restriction at the wall
- Now we wonder what should be the size of the near wall cells
- We consider theory based on flat plate analysis
- Using the wall functions it may be sufficient to put
- We look for
meeting (
) for - Friction coefficient
of turbulent boundary layer on the flat plate is known (correlation of measurements and DNS simulations) - For fast estimation: =
- More accurate estimation is:
- For
,
, 
= 
- So, finally the minimal cell height (the wall normal direction size) is
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