Instability of a backward-facing step flow modified by stationary streaky structures

被引：7

作者：

Boiko, A. V. ^{[1
]}

Dovgal, A. V. ^{[1
]}

Sorokin, A. M. ^{[1
]}

机构：

[1] Russian Acad Sci, Khristianovich Inst Theoret & Appl Mech, Siberian Branch, Novosibirsk 630090, Russia

来源：

PHYSICS OF FLUIDS | 2012年 / 24卷 / 10期

基金：

俄罗斯基础研究基金会;

关键词：

PARTICLE IMAGE VELOCIMETRY; BOUNDARY-LAYER; TRANSIENT GROWTH; TRANSITION; DISTURBANCES; SIMULATIONS; STABILITY; WAVES;

D O I：

10.1063/1.4761838

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

The present paper deals with small amplitude velocity oscillations at laminar boundary layer separation behind a backward-facing step on a flat plate. The focus is the effect of a spatially periodic stationary disturbance of the nominally 2D basic configuration on the linear instability of the separated shear layer. Nonstationary perturbations of the mean flow which is modulated by roughness elements spaced along the step are examined through wind-tunnel tests and stability calculations. Noteworthy is flow destabilization in the presence of streaks behind the line of separation. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4761838]

引用

页数：11

共 29 条

[1]

Alfredsson PH, 1996, FLUID MEC A, V35, P423

[2]

Bakchinov A. A., 1998, Fluid Dynamics, V33, P667

[3]

Bestek H., 1993, PHYS SEPARATED FLOWS, P73

[4] Particle image velocimetry of a low-Reynolds-number separation bubble [J].

Boiko, A. ;

Dovgal, A. ;

Hein, S. ;

Henning, A. .

EXPERIMENTS IN FLUIDS, 2011, 50 (01) :13-21

[5] Control of a laminar separating boundary layer by induced stationary perturbations [J].

Boiko, A. V. ;

Dovgal, A. V. ;

Hein, S. .

EUROPEAN JOURNAL OF MECHANICS B-FLUIDS, 2008, 27 (04) :466-476

[6] Transient growth of stationary flow perturbations at laminar boundary-layer separation [J].

Boiko, A. V. ;

Dovgal, A. V. ;

Sorokin, A. M. .

THERMOPHYSICS AND AEROMECHANICS, 2011, 18 (01) :101-106

[7]

Boiko AndreyV., 2012, Physics of Transitional Shear Flows: Instability and LaminarTurbulent Transition in Incompressible Near-Wall Shear Layers

[8] EXPERIMENTS IN A BOUNDARY-LAYER SUBJECTED TO FREE-STREAM TURBULENCE .2. THE ROLE OF TS WAVES IN THE TRANSITION PROCESS [J].

BOIKO, AV ;

WESTIN, KJA ;

KLINGMANN, BGB ;

KOZLOV, VV ;

ALFREDSSON, PH .

JOURNAL OF FLUID MECHANICS, 1994, 281 :219-245

[9] On Tollmien-Schlichting-like waves in streaky boundary layers [J].

Cossu, C ;

Brandt, L .

EUROPEAN JOURNAL OF MECHANICS B-FLUIDS, 2004, 23 (06) :815-833

[10]

DOVGAL AV, 1995, EUR J MECH B-FLUID, V14, P351

← 1 2 3 →