# Wolf Dynamics - Multiphysics simulations, optimization, and data analytics

## Y+ Wall Distance Estimation

 Input Freestream velocity: $$m/s$$ Density: $$kg/m^3$$ Dynamic viscosity: $$kg/m \; s$$ Reference Length: $$m$$ Desired $$y^+$$ value: Output Reynolds number: Estimated wall distance: $$m$$

The formulas used are given in CFD-Wiki. The Schlichting skin-friction formula, as described here (equation 21.16 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 $$Re < 10^9$$. The density and viscosity given by default in the form is for air at sea-level and room temperature (20°C).