first grid size for a given ylus
hi
i am going to model a turbulent flow over a flat plate. if i want to extract a given yplus, 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 

Quote:
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? 
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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