# Dimensionless wall distance (y plus)

(Difference between revisions)
 Revision as of 15:11, 11 May 2006 (view source)Jola (Talk | contribs)← Older edit Revision as of 15:11, 11 May 2006 (view source)Jola (Talk | contribs) Newer edit → Line 1: Line 1: A non-dimensional wall distance for a wall-bounded flow can be defined in the following way: A non-dimensional wall distance for a wall-bounded flow can be defined in the following way: - :$y^+ \equiv \frac{u_* ;, y}{\nu}$ + :$y^+ \equiv \frac{u_* \, y}{\nu}$ Where $u_*$ is the [[Friction velocity|friction velocity]] at the nearest wall, $y$ is the distance to the nearest wall and $\nu$ is the local [[Kinematic viscosity|kinematic viscosity]] of the fluid. Where $u_*$ is the [[Friction velocity|friction velocity]] at the nearest wall, $y$ is the distance to the nearest wall and $\nu$ is the local [[Kinematic viscosity|kinematic viscosity]] of the fluid.

## Revision as of 15:11, 11 May 2006

A non-dimensional wall distance for a wall-bounded flow can be defined in the following way:

$y^+ \equiv \frac{u_* \, y}{\nu}$

Where $u_*$ is the friction velocity at the nearest wall, $y$ is the distance to the nearest wall and $\nu$ is the local kinematic viscosity of the fluid.

$y^+$ is often refered to simply as y plus and is commonly used in boundary layer theory and in defining the law of the wall.