Numerical Modeling of Anisotropic Decay of a Distant Turbulent Wake behind a Self-Propelled Body in a Linearly Stratified Medium

摘要

The turbulent wakes behind bodies of revolution in a stratified medium were considered in a number of works [1-11]. The works devoted to the experimental, theoretical, and numerical modeling of the dynamics of turbulent wake behind a self-propelled body in a lin_early stratified medium were reviewed in [4, 10]. The results of detailed laboratory measurements of the char_acteristics of turbulence in a momentumless wake behind a body moving in a linearly stratified fluid are presented in [2]. It is shown that the decay of turbulence in a distant wake is characterized by a considerable anisotropy. The numerical modeling of such wakes and the comparison with experimental data [2, 3] were car_ried out in [3, 4, 7, 8]. The analysis of these works makes it possible to draw the conclusion that the known numerical models give no detailed description of the decay of turbulent-fluctuation intensities for the hori_zontal and vertical velocity components at large dis_tances from the body.