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.

流体在粗糙的表面上流动（例如，大气流在地面上的大气流，水流上的船体上的水流或通过工业管道流过的油流）可能会与光滑的表面有所不同。数十年来，所有粗糙度都在表面阻力中发生变化（通常是增加），而不会显着改变流动的结构。越来越多的证据表明，这并不总是正确的，并且显然，对于足够大的表面爆发物，这是最不可能的。对于外部流动（边界层）和内部流动（管道和通道），在这种“古典”观点的确切情况下，从来没有一致的努力来探索这种“古典”观点不足，而在粗糙表面和平滑表面流之间有什么区别差异。我们的目的是这样做，从而探索（i）如何影响受湍流细节（例如标量分散或传热）影响的过程可能会受到影响，以及（ii）预测技术中表面效应的常规建模如何变得不足以及如何改善它。

项目成果

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

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

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)

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