Use this Y Plus Calculator to determine the dimensionless wall distance, which is critical in computational fluid dynamics (CFD) to ensure accurate boundary layer simulations.
Y Plus Calculation Formula
The following formula is used to calculate the Y+ value, a dimensionless parameter:
Y+ = (U* * y) / ν
Variables:
- U*: Friction velocity (m/s)
- y: Distance to the wall (m)
- ν: Kinematic viscosity (m^2/s)
To calculate the Y+ value, multiply the friction velocity by the distance to the wall and then divide by the kinematic viscosity.
What is Y Plus?
Y Plus (Y+) is a non-dimensional distance used in CFD to determine the proper spacing for the first cell height off the wall in simulations involving turbulence. Proper Y+ values ensure that the boundary layer is accurately resolved, which is crucial for obtaining correct shear stress and heat transfer predictions.
How to Calculate Y Plus?
The following steps outline how to calculate Y+ using the