# Law of the wall

(Difference between revisions)
 Revision as of 13:22, 18 June 2010 (view source)Björn (Talk | contribs)← Older edit Revision as of 13:26, 18 June 2010 (view source)Björn (Talk | contribs) Newer edit → Line 18: Line 18: ''We should have a lin-log plot here of a typical turbulent boundary layer to illustrate where the log-law is valid, anyone have one handy?'' ''We should have a lin-log plot here of a typical turbulent boundary layer to illustrate where the log-law is valid, anyone have one handy?'' + + In the image y is replaced with the letter n. [[Image:law of the wall.jpg]] [[Image:law of the wall.jpg]] {{stub}} {{stub}}

## Revision as of 13:26, 18 June 2010

In the log layer the velocity profile can be estimated with the log law:

$u^+ = \frac{1}{\kappa} \, ln(y^+) + B$

Where:

 $u^+$ Dimensionless velocity $y^+$ Dimensionless wall distance $\kappa$ von Karman's constant ($\approx 0.41$) $C$ Constant ($\approx 5.1$)

We should have a lin-log plot here of a typical turbulent boundary layer to illustrate where the log-law is valid, anyone have one handy?

In the image y is replaced with the letter n.