Von Kármán constant

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:

u=frac{u_{star{k}lnfrac{z}{z_0}

where u is the velocity at height z above the roughness height z_0 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.

References

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

External links

* http://www.ccsm.ucar.edu/models/ccsm3.0/cpl6/users_guide/node21.html a list of physical constants used in the NCAR Community Climate System Model


Wikimedia Foundation. 2010.

Игры ⚽ Нужно решить контрольную?

Look at other dictionaries:

  • Theodore von Kármán — von Karman au CalTech JPL Naissance 11 mai 1881 Budapest (Autriche Hongrie) Décès …   Wikipédia en Français

  • Theodore von Kármán — Infobox Scientist name = box width = image width =150px caption = Von Karman at the Caltech JPL birth date = birth date|1881|05|11 birth place = death date = death date and age|1963|05|06|1881|05|11 death place = residence = citizenship =… …   Wikipedia

  • John von Neumann — Von Neumann redirects here. For other uses, see Von Neumann (disambiguation). The native form of this personal name is Neumann János. This article uses the Western name order. John von Neumann …   Wikipedia

  • Tawakkul Karman — en 2011. Tawakkul Karman, ou Tawakel,[1] (arabe : توكل كرمان), est une activiste yémenite de d …   Wikipédia en Français

  • Paul Henri Balluet d'Estournelles de Constant — Paul d Estournelles de Constant Paul Henri Benjamin Balluet d Estournelles de Constant, baron de Constant et de Rebecque, né à La Flèche le 22 novembre 1852 et mort à Paris le 15 mai 1924, est un diplomate et homme politique français, lauré …   Wikipédia en Français

  • Bertha von Suttner — Bertha Sophie Felicitas comtesse Kinský von Chinic und Tettau, baronne von Suttner (née le 9 juin 1843 à Prague morte le 21 juin 1914 à Vienne), fut une pacifiste autrichienne radicale, lauré …   Wikipédia en Français

  • Carl von Ossietzky — Memorial, Berlin Carl von Ossietzky (né le 3 octobre 1889 à Hambourg ; mort le 4 mai 1938 à Berlin), intellectuel pacifiste, éditait le grand hebdomadaire Die Weltbühne (La Scène mondiale) depuis …   Wikipédia en Français

  • Ganz Works — Ganz vállalatok Type Private company (former state company) Industry transport vehicle manufacturing, iron and steel manufacturing Headquarters Budapest, Hungary Products tramcars, tr …   Wikipedia

  • Greek letters used in mathematics, science, and engineering — Greek alphabet Αα Alpha Νν Nu Ββ Beta …   Wikipedia

  • Turbulence modeling — is the area of physical modeling where a simpler mathematical model than the full time dependent Navier Stokes Equations is used to predict the effects of turbulence.There are various mathematical models used in flow modelling to understand… …   Wikipedia

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”