y+ Wall-Layer Visualizer

Show whether a target y+ lands in the viscous sublayer, buffer layer, or log-law region with first-cell height.

visual calculatorTurbulence & Wall Modeling

Read the flow shape before trusting the number.

This page turns a CFD setup into regime, scale, and dominant-effect cues. Adjust the calculator below and compare the moving graphic with the computed result.

input scale

model

check

y+wall unitsmeshvisualization

formula

KaTeX rendered

\begin{aligned}\text{y+ = rho u\_tau y / mu}\\[0.35em]\text{y = y+ mu / (rho u\_tau)}\end{aligned}

ASCII source

y+ = rho u_tau y / mu, y = y+ mu / (rho u_tau)

rho (kg/m^3)mu (Pa*s)U_inf (m/s)reference length L (m)target y+skin-friction model

first-cell y (mm)

0.0121

u_tau (m/s)

1.2117

Re_L

2.042e+6

wall layer

viscous sublayer

Target y+ near 1 supports wall-resolved meshes. Wall functions usually need the first cell center in the log-law band, not inside the buffer layer.

y+wall units mesh visualization