Direct Numerical Simulation of Turbulent Flow of Ferrofluids

建议编号：CTS-0347044研究人员：Bruce A.FINLAYSONINSTUTION：WASHINGTONDIRECT FERROFLUIDS湍流数值模拟该研究计划的长期目标是在所有情况下模拟有磁场存在的磁流体的湍流流动，包括有热传递。这项资助的目标是应用对磁流体湍流的直接数值模拟(DNS)，以了解磁场及其与磁流体的相互作用如何改变湍流的物理。直接的数值模拟将为研究包括自旋和磁场在内的湍流物理提供完整的解决方案。这项工作将包括对磁流体在均匀流动(强调能量学)和槽道流动(强调通道壁面附近的流动如何被修正)中的湍流的直接数值模拟。由直接数值模拟的结果计算的平均场性质也可以与雷诺平均的N-S(k-e模型)解的结果相比较。。磁流体被认为是电力变压器中的冷却剂，因为磁对流可以帮助自然对流。这将增加现有变压器的容量或降低新变压器的成本，因为它们可以变得更小。然而，好处并不是一目了然的，因为磁对流可以增强也可以削弱自然对流，这取决于温度和磁场的复杂相互作用。因此，提高设计技能将是非常有用的。拟议的工作还可以为利用磁对流冷却空间中的物体提供基础，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的工程设计提供了更好的科学基础，又允许首席研究员继续参与本科生研究人员的工作，特别是在代表性不足的少数民族中。

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.