Turbulent flows over rough walls

湍流流过粗糙的墙壁

• 批准号: EP/D037166/1
• 负责人: Jonathan Morrison
• 金额: $ 33.19万
• 依托单位: Imperial College London
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2006
• 资助国家: 英国
• 起止时间: 2006 至 无数据
• 项目状态: 已结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FD037166%2F1
• 关键词: Turbulent; flows; over; rough; walls

Fluid flows over surfaces that are rough (like the atmospheric flow over the earth's surface, the water flow over a barnacled ship's hull, or oil flow through industrial pipework) might be expected to differ from those over smooth surfaces. It has for decades been believed that all the roughness does is to effect a change (usually an increase) in the surface drag, without changing significantly the structure of the flow away from the surface. There is increasing evidence that this is not always true and, clearly, for sufficiently large surface protruberances it is intuitively most unlikely. There has never been a concerted effort to explore under what precise circumstances this 'classical' view is inadequate and what are then the distinguishing differences between the rough-surface and smooth-surface flow, for both external flows (boundary layers) and internal flows (pipes & channels). We aim to do just that and thus to explore (i) how processes affected by details of the turbulence (e.g. scalar dispersion or heat transfer) might be influenced and (ii) how the usual modelling of surface effects in prediction techniques becomes inadequate and how it might be improved.

粗糙表面上的流体流动（如地球表面上的大气流动、带藤壶的船舶船体上的水流或工业管道中的油流）可能与光滑表面上的流体流动不同。几十年来人们一直认为，粗糙度所起的作用只是改变（通常是增加）表面阻力，而不会显著改变离开表面的流动结构。越来越多的证据表明，这并不总是正确的，显然，对于足够大的表面反射率，这是直观上最不可能的。从来没有一个共同的努力，探索在什么情况下，这种“经典”的观点是不够的，然后是什么粗糙表面和光滑表面的流动之间的区别，外部流动（边界层）和内部流动（管道和渠道）。我们的目标就是要做到这一点，从而探索（i）如何影响湍流的细节（例如标量色散或热传递）的过程可能会受到影响，（ii）如何在预测技术中的表面效应的通常建模变得不充分，以及如何改进。

项目成果

Scaling of turbulence structures in very-rough-wall channel flow

非常粗糙壁通道流中湍流结构的缩放

• 作者: David Birch (Author)

Advances in Turbulence XII - Proceedings of the 12th EUROMECH European Turbulence Conference, September 7-10, 2009, Marburg, Germany

湍流进展 XII - 第 12 届 EUROMECH 欧洲湍流会议论文集，2009 年 9 月 7-10 日，德国马尔堡

• DOI: 10.1007/978-3-642-03085-7_159
• 发表时间: 2009
• 作者: Birch D

IUTAM Symposium on The Physics of Wall-Bounded Turbulent Flows on Rough Walls

IUTAM 粗糙壁壁面湍流物理学研讨会

• DOI: 10.1007/978-90-481-9631-9_23
• 发表时间: 2010
• 作者: Birch D

Effects of very-large roughness in turbulent channel flow

湍流通道流中超大粗糙度的影响

• 发表时间: 2009
• 作者: D Birch