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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 64 66 68
  • We look for 69 meeting (crossref 2) for 64
  • Friction coefficient 70 of turbulent boundary layer on the flat plate is known (correlation of measurements and DNS simulations)
  • For fast estimation: 7071
  • More accurate estimation is:

    72(7.5)

  • For 73 75 74,img53 75 76 77 78 7980 81 8283 84 80 85 80 86 75  87
  • So, finally the minimal cell height (the wall normal direction size) is $ 1.9 mm$

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Averaging

At the moment only the following quantities are sampled: the pressure p, the absolute velocity U (no circumferential component), the relative velocity URel (no circumferential component), the absolute velocity magnitude magU and the relative velocity magnitude magURel.