Turbulent flow over walls and around solid objects

墙壁上和固体物体周围的湍流

• 批准号: 36496-2011
• 负责人: Bergstrom, Donald
• 金额: $ 3.57万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2015
• 资助国家: 加拿大
• 起止时间: 2015-01-01 至 2016-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=568738
• 关键词: Turbulent; flow; over; walls; around

The proposed research program uses both numerical and experimental methods to study turbulent flow. Turbulence is the most prevalent flow regime in industrial and environmental applications, and is characterised by enhanced levels of transport for momentum and scalar quantities. Often, turbulent flow involves the presence of a solid surface, which then significantly modifies the turbulence structure and makes the transport characteristics more complex to predict for design purposes. The numerical simulations and experiments being proposed will enhance our fundamental understanding of flows that fit this scenario. The research will be pursued in the context of four specific projects all of which relate to turbulent flow over a solid surface. The first application considers the wake behind a finite cylinder mounted in a boundary layer flow. Of special interest is the complex wake -- or region of disturbed flow -- immediately behind the cylinder. This flow scenario in some ways resembles a short exhaust stack. The second flow considers a plane wall jet over a flat surface, which can be either smooth or covered with surface roughness. The behaviour of the skin friction drag on the wall jet for rough surfaces is not yet well understood. Note that in some ways a finite cylinder resembles a single element of surface roughness. The third flow to be considered is the multiphase flow of a gas or liquid with solid particles. In this case, the solid surface is moving through the fluid, and the solid particles will generate small wakes as well as interact with each other. This flow scenario relates to pneumatic conveyance of granular material as in some agricultural machinery applications and liquid slurry flow in mining applications. The fourth project is the most novel and pertains to flow through a porous tissue scaffold, which is a developing biomedical application. The research program being proposed will be conducted within the fluid dynamics group in Mechanical Engineering at the University of Saskatchewan. It will serve to advance our fundamental understanding and also address some pressing technical challenges being encountered by Canadian industry.

提出的研究计划同时使用数值和实验方法来研究湍流。 湍流是工业和环境应用中最普遍的流动状态，其特征是增强动量和标量量的运输水平提高。 通常，湍流涉及固体表面的存在，然后显着修改了湍流结构，并使运输特性更加复杂，可以预测设计目的。 提出的数值模拟和实验将增强我们对适合这种情况的流动的基本理解。 这项研究将在四个特定项目的背景下进行，所有这些都涉及在固体表面上的湍流。 第一个应用程序考虑了安装在边界层流中的有限缸背后的唤醒。 特别感兴趣的是圆柱体后面的复杂唤醒或干扰流的区域。 这种流动方案在某些方面类似于短排气堆。 第二个流动将平面壁喷射在平坦的表面上，可以光滑或被表面粗糙度覆盖。 皮肤摩擦在壁喷气机上的行为尚未充分了解粗糙的表面。 请注意，在某些方面，有限缸类似于表面粗糙度的单个元素。 要考虑的第三个流量是带有固体颗粒的气体或液体的多相流。 在这种情况下，固体表面正在通过流体移动，固体颗粒将产生小唤醒并相互相互作用。 这种流动方案涉及颗粒材料的气动输送，就像在采矿应用中的某些农业机械应用和液体浆液中一样。 第四个项目是流过多孔组织支架的最新颖和有关的项目，这是一种正在发展的生物医学应用。 提出的研究计划将在萨斯喀彻温大学机械工程的流体动力学小组内进行。 它将提高我们的基本理解，并解决加拿大行业遇到的一些紧迫的技术挑战。