Support for US Participants and Phrasing Open Questions in the Kavli Program on Fluid-Particle Transport

对美国参与者的支持和在 Kavli 流体粒子传输项目中提出开放性问题

• 批准号: 1332328
• 负责人: James Jenkins
• 金额: $ 4.32万
• 依托单位: Cornell University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2013
• 资助国家: 美国
• 起止时间: 2013-09-01 至 2014-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1332328&HistoricalAwards=false
• 关键词: Support; US; Participants; Phrasing; Open

1332328PI: JenkinsA three-month long program devoted to fluid-mediated particle transport in geophysical flows will take place at the Kavli Institute for Theoretical Physics in Santa Barbara, California, between September 23 and December 20, 2013. This program will provide an opportunity to develop a consensus regarding the important issues that must be addressed and the key questions to be answered in order to advance the understanding of natural fluid-particle flows. Associated with the program are two focus weeks and a concluding conference. There are many elements of natural fluid-particle flows that are poorly understood. Examples are the in-fluence of the unsteady mean and fluctuating velocities on particles in a turbulent flow over a range of particle concentration and ratios of particle-fluid mass density; the nature of the inter-actions between particles and between the particles and fluid at the surface of a particle bed; and the mechanisms by which large-scale features develop on the bed in systems driven by water and the wind. Within the three-month program, two focus weeks and a concluding conference will take place that will involve researchers not attending the program. One focus week will be devoted to the interactions of particles with fluid turblence, the other will concentrate on mechanisms of erosion and deposition at the bed. The concluding confence, "Particle-Laden Flows in Nature", will take place during the last week of the program and attempt to provide an overview of the state of understanding of its subject.Particle-laden flows occur naturally and in many industrial processes. They are not so well understood as flows involving only a fluid. This is because the interaction between the fluid and the particles and those between particles in the fluid are complicated and not easy to describe mathematically. It is important to try to achieve such descriptions in order to predict phenomena such as dune formation by wind-blown sand, underwater avalanches that threaten pipeline and communications cables, avalanches of powder and granular snow, and flows of ash and hot gases or rocks in molten lava during volcanic eruptions.

1332328PI：詹金萨（Jenkinsa）三个月长的计划将在2013年9月23日至12月20日之间在加利福尼亚州圣塔芭芭拉（Santa Barbara）的卡夫利（Kavli）理论物理研究所举行，该计划将在地球物理流中进行流体介导的粒子运输，2013年9月23日至12月20日之间。该计划将提供有关自然问题的秩序和秩序的机会。流。与该计划相关的是两个焦点周和一个结束会议。天然流体粒子流的许多要素知之甚少。例子是在粒子浓度范围内的湍流中颗粒上不稳定的平均值和波动速度的浮动性以及颗粒流体质量密度的比率；颗粒之间以及粒子表面上的颗粒与流体之间的互动的性质；以及由水和风驱动的系统中大规模特征在床上发展的机制。在为期三个月的计划中，将举行两个焦点周和一个结论会议，这将涉及不参加该计划的研究人员。一个焦点一周将致力于颗粒与流体乌龟的相互作用，另一个将集中在床上的侵蚀和沉积机制上。结论性的批准是“自然界中充满粒子的流动”，将在该计划的最后一周进行，并试图概述对其受试者的理解状态。伴有颗粒的流动自然而然地发生在许多工业过程中。它们不太理解仅涉及流体的流量。这是因为流体与颗粒之间的相互作用以及流体中颗粒之间的相互作用很复杂，并且在数学上不容易描述。重要的是要尝试实现此类描述，以预测现象，例如通过风吹沙的沙丘形成，水下雪崩，威胁管道和通信电缆，粉末和颗粒雪的雪崩，以及在燃料爆发期间在摩尔熔岩中的灰气和热气或岩石的流动。