Coherent structures in wall-bounded turbulence

被引:39
|
作者
Dennis, David J. C. [1 ]
机构
[1] Univ Liverpool, Sch Engn, Liverpool L69 3GH, Merseyside, England
来源
基金
欧盟地平线“2020”;
关键词
turbulence; wall bounded flows; coherent structures; particle image velocimetry; LARGE-SCALE MOTIONS; DIRECT NUMERICAL-SIMULATION; VORTEX PACKETS; CHANNEL FLOW; 3-DIMENSIONAL STRUCTURES; VORTICAL STRUCTURES; WAKE MODEL; REGION; ORGANIZATION; LAYERS;
D O I
10.1590/0001-3765201520140622
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The inherent difficulty of understanding turbulence has led to researchers attacking the topic in many different ways over the years of turbulence research. Some approaches have been more successful than others, but most only deal with part of the problem. One approach that has seen reasonable success (or at least popularity) is that of attempting to deconstruct the complex and disorganised turbulent flow field into to a set of motions that are in some way organised. These motions are generally called "coherent structures". There are several strands to this approach, from identifying the coherent structures within the flow, defining their characteristics, explaining how they are created, sustained and destroyed, to utilising their features to model the turbulent flow. This review considers research on coherent structures in wall-bounded turbulent flows: a class of flow which is extremely interesting to many scientists (mainly, but not exclusively, physicists and engineers) due to their prevalence in nature, industry and everyday life. This area has seen a lot of activity, particularly in recent years, much of which has been driven by advances in experimental and computational techniques. However, several ideas, developed many years ago based on flow visualisation and intuition, are still both informative and relevant. Indeed, much of the more recent research is firmly indebted to some of the early pioneers of the coherent structures approach. Therefore, in this review, selected historical research is discussed along with the more contemporary advances in an attempt to provide the reader with a good overview of how the field has developed and to highlight the perspicacity of some of the early researchers, as well as providing an overview of our current understanding of the role of coherent structures in wall-bounded turbulent flows.
引用
收藏
页码:1161 / 1193
页数:33
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