A closed model of fluctuating particle motion in a turbulent flow

被引：2
|
作者：
Derevich, I. V.
Zdor, A. G.
机构：
来源：
FLUID DYNAMICS | 2009年 / 44卷 / 01期
基金：
俄罗斯基础研究基金会;
关键词：
turbulence; Lagrangian and Eulerian variables; Lagrangian and Eulerian correlations; particles; turbulent diffusion; turbulent spectrum; TEMPERATURE-FLUCTUATIONS; ISOTROPIC TURBULENCE; DISPERSION; DIFFUSION; VELOCITY;
D O I：
10.1134/S0015462809010062
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Random particle motion in a turbulent and molecular velocity fluctuation field is considered. Using a spectral representation of the carrier-phase Eulerian velocity fluctuation correlations, a closed system of integral equations for calculating the carrier-phase velocity correlation along the particle trajectory and the particle Lagrangian velocity fluctuation correlation is obtained. Based on this system, the fluctuations of the particle parameters are analyzed. In the limiting case of a passive admixture, an estimate is found for the ratio of the integral Lagrangian and Eulerian time scales and the Kolmogorov constant for the Lagrangian structure function of the carrier-phase velocity fluctuations.
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页码：55 / 67
页数：13
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