Numerical simulation of the wake of a towed sphere in a weakly stratified fluid

Autor:	James W. Rottman, Douglas G. Dommermuth, Evgeny A. Novikov, George E. Innis
Rok vydání:	2002
Předmět:	Physics Computer simulation Turbulence Mechanical Engineering Reynolds number Constant speed Reynolds stress equation model Mechanics Wake Dissipation Condensed Matter Physics symbols.namesake Mechanics of Materials Reynolds decomposition symbols Statistical physics
Zdroj:	Journal of Fluid Mechanics. 473:83-101
ISSN:	1469-7645 0022-1120
DOI:	10.1017/s0022112002002276
Popis:	We present some preliminary results from using large-eddy simulation to compute the late wake of a sphere towed at constant speed through a non-stratified and a uniformly stratified fluid. The wake is computed in each case for two values of the Reynolds number: Re = 104, which is comparable to that used in laboratory experiments, and Re = 105. An important aspect of the simulation is the use of an iterative procedure to relax the initial turbulence field so that the normal and shear turbulent stresses are properly correlated and the turbulent production and dissipation are in equilibrium. For the lower Reynolds number our results compare well with existing laboratory experimental results. For the higher Reynolds number we find that even though the turbulence is more developed and the wake contains finer structure, most of the similarity properties of the wake are unchanged compared with those observed at the lower Reynolds number.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::e896777413f3e14a0cff73046858df41 https://doi.org/10.1017/s0022112002002276 Zobrazit plný text záznamu