Numerical simulation of particle trajectories in inhomogeneous turbulence,II: Systems with variable turbulent velocity scale |
| |
| Authors: | J D Wilson G W Thurtell G E Kidd |
| |
| Institution: | (1) Department of Land Resource Science, University of Guelph, Guelph, Ontario, Canada;(2) New Zealand Meteorological Service, P.O. Box 722, Wellington, New Zealand |
| |
| Abstract: | It is shown that for the purpose of trajectory simulation, the vertical velocityw
L
(t) of a fluid element, which is moving in a system (such as a forest canopy, or the unstably stratified atmospheric surface layer) whose turbulent velocity scale 
w
is height-dependent, must be chosen from a frequency-distribution which is asymmetric aboutw
L
= 0. If the gradient 
w
/z varies only slowly with height, correct trajectories may be obtained by adding a bias
(where 
L
is the length scale) to a fluctuating velocity chosen from a symmetric distribution with variance
w
2(z). |
| |
| Keywords: | |
| 本文献已被 SpringerLink 等数据库收录！ |
|
