Global stability of a jet in crossflow

被引：172

作者：

Bagheri, Shervin ^{[1
]}

Schlatter, Philipp ^{[1
]}

Schmid, Peter J. ^{[2
]}

Henningson, Dan S. ^{[1
]}

机构：

[1] Royal Inst Technol, Dept Mech, Linne Flow Ctr, SE-10044 Stockholm, Sweden

[2] Ecole Polytech, CNRS, Lab Hydrodynam LadHyX, F-91128 Palaiseau, France

来源：

JOURNAL OF FLUID MECHANICS | 2009年 / 624卷

基金：

瑞典研究理事会;

关键词：

SHEAR-LAYER INSTABILITIES; LINEAR-ANALYSIS; CYLINDER; SENSITIVITY; WAKE;

D O I：

10.1017/S0022112009006053

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

A linear stability analysis shows that the jet in crossflow is characterized by self-sustained global oscillations for a jet-to-crossflow velocity ratio of 3. A fully three-dimensional unstable steady-state solution and its associated global eigenmodes are computed by direct numerical simulations and iterative eigenvalue routines. The steady flow, obtained by means of selective frequency damping, consists mainly of a (steady) counter-rotating vortex pair (CVP) in the far field and horseshoe-shaped vortices close to the wall. High-frequency unstable global eigenmodes associated with shear-layer instabilities on the CVP and low-frequency modes associated with shedding vortices in the wake of the jet are identified. Furthermore, different spanwise symmetries of the global modes are discussed. This work constitutes the first simulation-based global stability analysis of a fully three-dimensional base flow.

引用

页码：33 / 44

页数：12

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