CFD Online - Y-Plus Wall Distance Estimation Y+ Wall Distance Estimation The formulas used are give in CFD-Wiki here The Schlichting skin-friction formula, as desribed here (equation 21 16 footnote in Schlichting), is used to estimate the local skin-friction for a turbulent boundary layer on a smooth flat plate The correlation is valid for Re < 10^9
Dimensionless wall distance (y plus) - CFD Online A y+ wall distance estimation script provided by CFD Online Uses the free-stream velocity and gas-data to estimate the wall distance needed to obtain a desired y+ value at a certain boundary layer length
What is y+ (yplus)? - Fluid Flow CFD - SimScale CAE Forum The following page explains how you can generate the desired y+ (yplus) value on SimScale and check if your settings are correct: Y+ (yplus) - Generate Wall Spacing for CFD
Y plus wall distance estimation -- CFD-Wiki, the free CFD reference When meshing it is often useful to be able to estimate the wall-distance needed to obtain a certain Y+ value To estimate this you can do the following: 1 Compute the Re number: 2 Estimate the skin friction using one of the formulas given here, for example, using the Schlichting skin-friction correlation: 3 Compute the Wall shear stress: 4 Compute the Friction velocity: 5 Compute the wall
CFD Online - Tools Works well for those of you who don't like reverse polish notation Unit Convertor Can convert between most units used in fluid dynamics Y+ Estimation Estimates the wall distance needed to obtain a desired Y+ value Turbulence Properties, Conversions Boundary Estimations Use the tools here to convert and estimate turbulent properties at
Y+ (y plus) in globally laminar flows - SimScale CAE Forum The y+ value is important for the turbulent-model It defines the height of the viscous-sub-layer where a laminar flow near the wall in turbulent flows occurs I’m not a specialist but i would say it doesn’t matter how big the height of your first cell is because there isn’t a turbulence model regard
Choosing Between Wall Modelling Wall Resolution | SimScale The y+ value will determine whether or not your wall modelling strategy is valid For full resolution the y+ value should be kept below 1, with the first cell center is placed in the viscous sub-layer