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Von Kármán constant

A unitless constant describing the logarithmic velocity profile of a turbulent fluid near a no-slip boundary. The equation for such boundary layer flow profiles is:


where u is the velocity at height z above the roughness height z0 where u goes to 0. k is the von Kármán constant (typically the value 0.41 is used), and u_{\star} is the friction velocity which describes the amount of turbulence in the flow.

Used in boundary layer meteorology to calculate fluxes of momentum, heat and moisture from the atmosphere to the land surface. Named for Theodore von Kármán.

See also Turbulence modeling.


Bonan, G. B. 2005. Land Surface Model (LSM 1.0) for Ecological, Hydrological, Atmospheric Studies. Model product. Available on-line [1] from Oak Ridge National Laboratory Distributed Active Archive Center, Oak Ridge, Tennessee, U.S.A.

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Von_Kármán_constant". A list of authors is available in Wikipedia.
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