Direct Numerical Simulation of Turbulent Flow of Ferrofluids

铁磁流体湍流的直接数值模拟

• 批准号: 0347044
• 负责人: Bruce Finlayson
• 金额: $ 30.84万
• 依托单位: University of Washington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2004
• 资助国家: 美国
• 起止时间: 2004-09-15 至 2008-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0347044&HistoricalAwards=false
• 关键词: Direct; Numerical; Simulation; Turbulent; Flow

PROPOSAL NO.: CTS-0347044PRINCIPAL INVESTIGATOR: BRUCE A. FINLAYSONINSTITUTION: UNIVERSITY OF WASHINGTONDIRECT NUMERICAL SIMULATION OF TURBULENT FLOW OF FERROFLUIDSThe long-term goal of this research program is to model turbulent flow of a ferrofluid in the presence of a magnetic field, in all situations, including with heat transfer. The goal of this grant is to apply direct numerical simulation (DNS) of turbulent flow of ferrofluids to learn how the physics of turbulent flow is modified by the magnetic field and its interaction with a ferrofluid. The direct numerical simulations will provide complete solutions to study the physics of turbulence including spin and the magnetic field. The work will include the direct numerical simulation of turbulent flow of ferrofluids in homogeneous flow (emphasizing energetics) and channel flow (emphasizing how the flow near a channel wall is modified.). The computation of mean field properties from the results of the direct numerical simulations can also be compared with results from the Reynolds-averaged Navier-Stokes (k-e model) solutions. . Ferrofluids have been suggested as coolants in electrical transformers, because the magnetic convection can aid natural convection. This would result in either increased capacity in existing transformers or reduced cost in new transformers, since they could be made smaller. The benefits are not straightforward, however, because magnetic convection can either enhance or detract from natural convection, depending on the complicated interaction of the temperature and magnetic fields. Thus, improved design skills will be very useful. The proposed work could also provide a basis for cooling objects in space with magnetic convection, when that same equipment is cooled on earth by natural convection. The broader impact of the proposed work is that it both provides an enhanced scientific basis for engineering design of equipment benefiting people and permits the continuation of the Principal Investigators' involvement with undergraduate researchers, especially among under represented minorities.Funded by Fluid Dynamics and Hydraulics and Particulate and Multiphase Processes Programs.

建议没有。项目编号：cts0347044项目负责人：BRUCE a . finlayson机构：华盛顿大学铁磁流体湍流的直接数值模拟本研究项目的长期目标是模拟磁场存在下铁磁流体在包括传热在内的所有情况下的湍流流动。本基金的目标是应用铁磁流体湍流的直接数值模拟（DNS）来了解磁场及其与铁磁流体的相互作用如何改变湍流的物理特性。直接数值模拟将为包括自旋和磁场在内的湍流物理研究提供完整的解决方案。这项工作将包括铁磁流体在均匀流动（强调能量学）和通道流动（强调通道壁附近的流动如何被改变）中的湍流的直接数值模拟。直接数值模拟结果的平均场性质计算也可以与reynolds -average Navier-Stokes （k-e模型）解的结果进行比较。铁磁流体被认为是变压器的冷却剂，因为磁对流可以帮助自然对流。这将导致现有变压器的容量增加或新变压器的成本降低，因为它们可以做得更小。然而，好处并不直接，因为磁对流可以增强或减弱自然对流，这取决于温度和磁场之间复杂的相互作用。因此，提高设计技能将非常有用。拟议的工作还可以为利用磁对流冷却太空中的物体提供基础，当同样的设备在地球上通过自然对流冷却时。拟议工作的更广泛影响是，它既为造福人类的设备工程设计提供了增强的科学基础，又允许首席研究员继续参与本科生研究人员，特别是在代表性不足的少数民族中。由流体动力学和水力学以及颗粒和多相过程项目资助。