Y-Plus Calculator
Free calculate y+ (y-plus), the dimensionless wall distance in fluid dynamics. essential for boundary layer analysis and cfd mesh sizing.
Input Parameters
Water (20°C): ~1×10⁻⁶ m²/s, Air (20°C): ~1.5×10⁻⁵ m²/s
Results
Enter parameters to calculate y+
Y-Plus Formula
Y-Plus Equation
y+ = (y × u*) / ν
Where y = wall distance, u* = friction velocity, ν = kinematic viscosity
Y-Plus Guidelines
- • y+ < 1: Viscous sublayer
- • y+ = 1-5: Buffer layer
- • y+ = 5-30: Log-law region
- • y+ > 30: Outer layer