Quadrant analysis of persistent spatial velocity perturbations over square-bar roughness

被引：83

作者：

Pokrajac, Dubravka ^{[1
]}

Campbell, Lorna Jane ^{[1
]}

Nikora, Vladimir ^{[1
]}

Manes, Costantino ^{[1
]}

McEwan, Ian ^{[1
]}

机构：

[1] Univ Aberdeen, Dept Engn, Aberdeen AB24 3UE, Scotland

来源：

EXPERIMENTS IN FLUIDS | 2007年 / 42卷 / 03期

关键词：

D O I：

10.1007/s00348-006-0248-0

中图分类号：

TH [机械、仪表工业];

学科分类号：

0802 ;

摘要：

We explore a new application of the quadrant method in the context of the double-averaged Navier-Stokes equations for studying open channel flow near rough beds. Quadrant analysis is applied to spatial disturbances of time-averaged velocity components, using the experimental data from flow over two-dimensional regular transverse square-bar roughness. The spatial velocity disturbances change periodically performing a full cycle over a single roughness element, so that the quadrant diagrams are regular closed orbits. A colour code is used to produce a quadrant map of the flow cross-section, which reveals contributions from each quadrant to the time-averaged momentum transfer.

引用

页码：413 / 423

页数：11

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