# first grid size for a given y-lus

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 February 2, 2011, 18:16 first grid size for a given y-lus #1 Senior Member     Morteza Join Date: May 2010 Location: Iran,Islamic Republic of Posts: 159 Rep Power: 7 hi i am going to model a turbulent flow over a flat plate. if i want to extract a given y-plus, how can i set the first grid size? is there any formula to calculate the distance between wall and first grid in a given flow? thank you in advance

 February 2, 2011, 19:03 #2 Senior Member   Join Date: Apr 2009 Posts: 129 Rep Power: 8

February 2, 2011, 19:27
#3
Senior Member

Morteza
Join Date: May 2010
Location: Iran,Islamic Republic of
Posts: 159
Rep Power: 7
Quote:
 Originally Posted by f-w http://geolab.larc.nasa.gov/APPS/YPlus/
thank you dear friend
another question.. i mentioned that i want to model a flat plate.. is this calculator can be used for flow over any arbitrary geometry or this is only for flat plate?

 February 3, 2011, 13:05 #4 Senior Member   Join Date: Apr 2009 Posts: 129 Rep Power: 8 At the top of the page: "This page provides a worksheet for estimating the normal spacing to be used in a viscous CFD grid. Estimates are for a turbulent flat plate in free air and are based on the Sutherland formula for viscosity." It's a good starting point for arbitrary geometry. Run your simulation (not necessarily until convergence) and plot y+; then adjust mesh accordingly.

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