CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Wiki > Law of the wall

Law of the wall

From CFD-Wiki

Revision as of 08:32, 7 September 2011 by Peter (Talk | contribs)
Jump to: navigation, search

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

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

and close to the wall in the viscous sublayer

u^+ = y^+

Where:

u^+ Dimensionless velocity
y^+ Dimensionless wall distance
\kappa von Karman's constant (\approx 0.41)
B 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.

Error creating thumbnail: /var/www/vhosts/cfd-online.com/httpdocs/W/bin/ulimit4.sh: line 4: /usr/bin/rsvg: No such file or directory

Img lawOfTheWall whiteBG.png


My wiki