A Multiscale Approach to Disperse Two-phase Flow

分散两相流的多尺度方法

• 批准号: 0625138
• 负责人: Andrea Prosperetti
• 金额: $ 24万
• 依托单位: Johns Hopkins University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2006
• 资助国家: 美国
• 起止时间: 2006-09-01 至 2010-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0625138&HistoricalAwards=false
• 关键词: Multiscale; Approach; Disperse; Two; phase

ABSTRACTProposal Number: 0625138Principal Investigator: Prosperetti, AndreiAffiliation: Johns Hopkins UniversityProposal Title: A multi-scale approach to disperse two-phase flowIntellectual Merit:This work is the first application of multiscale computing to a disperse multiphase flow problem. Its objectives are to develop methods to couple detailed local numerical solutions of fluid flow with suspended particles to a coarse-grained description based on averaged equations. The specific objective is to study the effect of the bounding solid walls on a disperse fluid particle flow. While much progress has been made in the treatment of such flows by means of averaged equations, the proper boundary conditions to be imposed on the solution of these equations are not well established. In order to address this problem, it is proposed to conduct a multiscale simulation in which the wall region will be treated by direct numerical simulation accurately solving the Navier-Stokes equations with suspended finite-sized particles. This detailed model will be coupled to an averaged-equations model describing the flow in the regions away from the walls. Beyond the specific results for the boundary conditions problem, it is expected that an accurate and efficient solution of the many issues that arise in the coupling of the two descriptions will open the way to other applications of multiscale computing to multiphase flow. Computational limitations have forced the vast majority of previous simulations to be conducted by approximating the particles as mass points in conditions of exceedingly small particle concentration. There are many very important situations which cannot be studied by these means: particles suspended in a liquid, non-dilute systems and many others. The algorithm to be used here is capable of taking full account of the finite extent of the particles and to simulate dense systems.Broader Impacts:Multiphase flow is a very vital area of contemporary research. There are compelling scientific reasons for the interest in this research: the statistical treatment of problems of this type is as necessary as it is challenging; a large fraction of the entire discipline of Fluid Mechanics is relevant; and fundamental processes, such as clustering and diffusion are incompletely understood. The successful development of multiscale computational techniques will have a significant impact on the progress of the discipline. Young researchers trained in this field will be able to join a vibrant scientific community addressing significant research objectives.

摘要提案编号：0625138主要研究者：Prosperetti，Andrei单位：约翰霍普金斯大学提案标题：分散两相流的多尺度方法知识点：这项工作是多尺度计算在分散多相流问题中的首次应用。它的目标是开发方法耦合详细的局部数值解的流体流动与悬浮颗粒的粗粒度的描述平均方程的基础上。具体目标是研究边界固体壁对分散流体颗粒流的影响。虽然在用平均方程处理这种流动方面已经取得了很大的进展，但对这些方程的解所施加的适当边界条件还没有很好地确定。为了解决这个问题，建议进行多尺度模拟，其中壁区域将被处理的直接数值模拟精确地求解Navier-Stokes方程与悬浮的有限尺寸的颗粒。这个详细的模型将被耦合到一个平均方程模型描述的区域远离墙壁的流动。除了边界条件问题的具体结果之外，预计在两种描述的耦合中出现的许多问题的准确和有效的解决方案将为多尺度计算在多相流中的其他应用开辟道路。 计算的限制迫使绝大多数以前的模拟进行近似的粒子作为质量点的条件下，非常小的粒子浓度。有许多非常重要的情况是不能用这些方法研究的：悬浮在液体中的颗粒，非稀释系统和许多其他情况。 这里使用的算法能够充分考虑颗粒的有限范围，并模拟稠密系统。更广泛的影响：多相流是当代研究的一个非常重要的领域。有令人信服的科学理由对这项研究的兴趣：这种类型的问题的统计处理是必要的，因为它是具有挑战性的;整个流体力学学科的很大一部分是相关的;基本过程，如聚类和扩散不完全理解。多尺度计算技术的成功发展将对该学科的发展产生重大影响。在这一领域受过培训的年轻研究人员将能够加入一个充满活力的科学界，实现重大的研究目标。