Three-dimensional numerical simulation of a vortex ring impacting a bump

被引：1

作者：

Ren, Heng ^{[1
]}

Xu, Changyue ^{[2
]}

机构：

[1] China Elect Technol Grp Corp, Res Inst 38, Hefei 230031, Anhui, Peoples R China

[2] Nanjing Univ Aeronaut & Astronaut, Coll Aerosp Engn, Nanjing 210016, Jiangsu, Peoples R China

来源：

THEORETICAL AND APPLIED MECHANICS LETTERS | 2014年 / 4卷 / 03期

基金：

中国国家自然科学基金;

关键词：

large eddy simulation; vortex ring; bump; vortical structure; turbulent state;

D O I：

10.1063/2.1403204

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

A vortex ring impinging on a three-dimensional bump is studied using large eddy simulation for a Reynolds number Re = 4 x 10(4) based on the initial translation speed and diameter of the vortex ring. The effects of bump height on the vortical flow phenomena and the underlying physical mechanisms are investigated. Based on the analysis of the evolution of vortical structures, two typical kinds of vortical structures, i.e., the wrapping vortices and the hair-pin vortices, are identified and play an important role in the flow state evolution. The circulation of the primary vortex ring reasonably elucidates some typical phases of flow evolution. Furthermore, the mechanism of flow transition from laminar to turbulent state has been revealed based on analysis of turbulent kinetic energy. (C) 2014 The Chinese Society of Theoretical and Applied Mechanics.

引用

页数：7

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