Dimensionless wall distance (y plus)
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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: | ||
| - | :<math>y^+ \equiv \frac{u_* | + | :<math>y^+ \equiv \frac{u_* \, y}{\nu}</math> |
Where <math>u_*</math> is the [[Friction velocity|friction velocity]] at the nearest wall, <math>y</math> is the distance to the nearest wall and <math>\nu</math> is the local [[Kinematic viscosity|kinematic viscosity]] of the fluid. | Where <math>u_*</math> is the [[Friction velocity|friction velocity]] at the nearest wall, <math>y</math> is the distance to the nearest wall and <math>\nu</math> 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:
Where 
is the friction velocity at the nearest wall, 
is the distance to the nearest wall and 
is the local kinematic viscosity of the fluid.
is often refered to simply as y plus and is commonly used in boundary layer theory and in defining the law of the wall.
