The langevin model for turbulent diffusion
The langevin model for turbulent diffusion
复制标题
湍流扩散的朗之万模型
DOI：
10.1080/03091927108236054
复制
发表时间：
1971
影响因子：
1.3
通讯作者：
R. Peskin
中科院分区：
文献类型：
--
作者：
E. Krasnoff;R. Peskin
摘要通过改进的朗之万模型方法，研究了湍流扩散的拉格朗日方法。改进后的模型部分占压力和粘性应力之间的相互作用，不包括在以前的研究中的相互作用。该模型用于获得一个和两个粒子的色散关系，它允许计算欧拉-拉格朗日尺度关系。湍流雷诺数和理查森的扩散定律的时间跨度限制。两个粒子之间的加速度的非平稳性进行了讨论，因为它涉及到理查森定律，并考虑在实验室和地球物理流体动力学数据的结论。
Abstract The Lagrangian approach to turbulent diffusion is considered through an improved Langevin model approach. The improved model partially accounts for the interaction between pressure and viscous stresses, an interaction not included in previous studies. The model is used to obtain one and two particle dispersion relations and it permits calculation of Eulerian-Lagrangian scale relations. Turbulence Reynolds number and time span limits for Richardson's law of diffusion are obtained. Non-stationarity of the acceleration between two particles is discussed as it relates to Richardson's law and the conclusions are considered in view of both laboratory and geophysical fluid dynamical data.