Extension at the downstream end of turbulent band in channel flow

被引：9

作者：

Liu, Jinsheng ^{[1
]}

Xiao, Yue ^{[2
,3
]}

Zhang, Linsen ^{[2
,3
]}

Li, Mogeng ^{[4
]}

Tao, Jianjun ^{[2
,3
]}

Xu, Shengjin ^{[1
]}

机构：

[1] Tsinghua Univ, Sch Aerosp Engn, AML, Beijing 100084, Peoples R China

[2] Peking Univ, Coll Engn, Dept Mech & Engn Sci, SKLTCS, Beijing 100871, Peoples R China

[3] Peking Univ, Coll Engn, Dept Mech & Engn Sci, CAPT HEDPS, Beijing 100871, Peoples R China

[4] Univ Melbourne, Dept Mech Engn, Melbourne, Vic 3010, Australia

来源：

PHYSICS OF FLUIDS | 2020年 / 32卷 / 12期

基金：

中国国家自然科学基金;

关键词：

PLANE; TRANSITION; STATES;

D O I：

10.1063/5.0032272

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

In this Letter, the velocity structures and the extension behavior of localized turbulent bands in channel flows are measured by particle image velocimetry in a plane parallel to the walls and are analyzed by comparing with direct numerical simulations at low Reynolds numbers. It is illustrated that the convection velocity of the band head (band's downstream end) is not determined by the formation and propagation of low-speed streaks but by a high-speed "hat" shaped region near the band head. This "hat" region travels downstream obliquely like a solitary wave and leaves newly generated low-speed streaks to travel slowly in the spanwise direction, leading to the head extension of turbulent bands.

引用

页数：6

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