showed that the von Kármán constant is not universal in natural waterways. The value of the constant was found to vary significantly due to measurement uncertainties in the mean velocity, friction velocity and the wall distance, and the number of data points included in the analysis. 749, Issue. stənt] (fluid mechanics) A dimensionless number formed from the velocity of turbulent flow parallel to a plane wall, the distance from the wall, the shear stress, and the density of the fluid; for a wide range of flow patterns it has a constant value. 卡门假设混合长和速度廓线的关系所引入的经验系数。实验室和大气近地面层测定值在0.35~0.43之间,近年来认为0.40比较合理。 图集. La constante de von Kármán est souvent utilisée en modélisation des turbulences, par exemple en météorologie de la couche limite pour calculer les flux de quantité de mouvement, de chaleur et d'humidit é entre l'atmosphère et le sol. Elle est considérée comme étant universelle (κ ≈ 0.40). The best estimate for the von Kármán constant in turbulent pipe flow is found to be $0.40 \pm 0.02$ . 1Instituto de Agricultura Sostenible, CSIC, Finca Cordoba, Spain.
V百科往期回顾. CrossRef; Google Scholar; Khoury, George K El Schlatter, Philipp Brethouwer, Geert and Johansson, Arne V 2014.
Turbulent pipe flow: Statistics,Re-dependence, structures and similarities with channel and boundary layer flows. 词条统计. The Karman constant - widely used in atmospheric science and engineering turbulence modelling, and proposed by Prandtl1 in 1925 and von Karman2 in 1930 to describe the mean velocity of a turbulent wall-bounded flow3 - leads to a logarithmic profile in an overlap region near the wall. Journal of Fluid Mechanics, Vol. 2Department of Agronomy, University of Córdoba, Cordoba, Spain. 卡门常数的概述图. They found that k is different from 0.41 in flows with either low submergence or with bed and sus-pended load transport. Estimating the value of von Kármán’s constant in turbulent pipe flow. L'équation décrivant un tel profil est la suivante : = ⋆ , où u est la vitesse moyenne du fluide à la hauteur z au-dessus de la limite. En mécanique des fluides, la constante de von Kármán [1], nommée d'après Theodore von Kármán, est une constante sans dimension décrivant le profil logarithmique des vitesses d'un fluide turbulent sans glissement à la limite. , p. 79. In fluid dynamics, the von Kármán constant (or Kármán's constant), named for Theodore von Kármán, is a dimensionless constant involved in the logarithmic law describing the distribution of the longitudinal velocity in the wall-normal direction of a turbulent fluid flow near a boundary with a no-slip condition.
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