http://www.pointwise.com/yplus/Compute Grid Spacing for a Given Y+Improve CFD Accuracy with Correct Mesh ResolutionIt's important that your mesh near the wall is properly sized to ensure accurate simulation of the flowfield. This calculator computes the height of the first mesh cell off the wall required to achieve a desired Y+ using flat-plate boundary layer theory.Parte superior do formulrioInputU:freestream velocity (m/s):freestream density (kg/m3):dynamic viscosity (kg/m s)L:reference length (m)y+:desired y+Outputs:wall spacing (m)Rex:Reynolds numberNote: -1 indicates an input errorParte inferior do formulrioCalculate Grid Spacing on iPhone and AndroidTM

Now you can compute wall spacing while at your desk or while on the road with the Y+ Calculator for iPhone or Android. This free app is a handy tool for calculating the grid spacing at a wall to achieve a target y+ value for viscous computational fluid dynamics (CFD) computations. Simply specify the flow conditions, the desired y+ value, and compute your grid spacing. The Y+ Calculator converts between SI and Imperial units.The MathThese computations are based on flat-plate boundary layer theory from Frank M. White'sFluid Mechanics5th edition, page 467.Rex=ULCf=0.026Rex1/7wall=CfU22Ufric=walls=y+UfricNote: The equations useMathMLmarkup. Certain browsers (Chrome and Internet Explorer, for example), currently do not properly render MathML.