Law of the wall

(Difference between revisions)
 Revision as of 09:54, 17 December 2008 (view source)Peter (Talk | contribs)m (Reverted edits by DrondArsit (Talk) to last version by Jola)← Older edit Revision as of 13:22, 18 June 2010 (view source)Björn (Talk | contribs) Newer edit → Line 1: Line 1: In the log layer the velocity profile can be estimated with the log law: In the log layer the velocity profile can be estimated with the log law: - :$u^+ = \frac{1}{\kappa} \, ln(y^+) + C$ + :$u^+ = \frac{1}{\kappa} \, ln(y^+) + B$ Where: Where: 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?'' + + [[Image:law of the wall.jpg]] {{stub}} {{stub}}

Revision as of 13:22, 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?