Vortex dynamics of a sphere wake in proximity to a wall

被引：10
|
作者：
Zhao, Hui [1 ]
Liu, Xiaofei [1 ]
Li, Dong [1 ]
Wei, Anyang [1 ]
Luo, Kun [1 ]
Fan, Jianren [1 ]
机构：
[1] Zhejiang Univ, State Key Lab Clean Energy Utilizat, 38 Zheda Rd, Hangzhou 310027, Zhejiang, Peoples R China
来源：
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW | 2016年 / 79卷
基金：
中国国家自然科学基金;
关键词：
Vortex dynamics; Sphere wake; Direct numerical simulation; Immersed boundary method; FLOW STRUCTURES; SHEAR-FLOW; DRAG; DOWNSTREAM; SIMULATION; CYLINDER; PARTICLE;
D O I：
10.1016/j.ijmultiphaseflow.2015.10.005
中图分类号：
O3 [力学];
学科分类号：
08 ; 0801 ;
摘要：
Toward getting the vortex dynamics characteristics and wake structure of a sphere in proximity to a wall, the effect of a proximal flat plate on the wake of a stationary sphere is investigated via direct numerical simulation. The vortex shedding process and the significant variation of the wake structure are described in detail. The drag coefficient reduces and the wake structure of the sphere becomes complex due to the combined effect of the wake flow and the wall. A jet flow forms between the sphere and the flat plate, which suppresses the vortex separation on the bottom of the sphere. The asymmetric distributions of the coherent structures and the recirculation region behind the sphere are discussed. Besides vortex shedding patterns, the time -averaged velocity distribution, vortex dynamics, distribution regularities of turbulent kinetic energy and enstrophy are investigated. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：88 / 106
页数：19
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