题目：Two-way Interactions in Particle-Laden Turbulent Channel Flow: Preliminary Results from Particle-Resolved Simulations

报告人：王连平 教授
Mechanical Engineering, 126 Spencer Laboratory, University of Delaware, Newark, Delaware 19716-3140, USA

主持人：陈十一教授

时间：12月3日（周二）下午2:00

地点：工学院1号楼210会议室

 

    Modulation of the carrier phase turbulence by finite-size inertial particles is relevant to many industrial and environmental applications (e.g., effect of sea-spray droplets on hurricane development). The nature and level of modulation depend on many factors including scales and geometric configurations of the carrier phase flow and particle characteristics such as size, density, mass loading. Finite-size particles may introduce both local viscous dissipation and kinetic energy production.

    Most previous studies of two-way interactions in particle-laden turbulent channel flows were performed using the point-particle approach. Here we present preliminary results on two-way interactions of finite-size particles and fluid turbulence in a channel flow. The lattice Boltzmann approach is used to resolve both the channel flow and the disturbance flows around moving particles. Results of single-phase turbulent channel flows are first compared to published benchmark DNS results to validate the lattice Boltzmann approach. Preliminary results on turbulent particle-laden channel flow are analyzed at three levels: whole-field, phase-partitioned, and profiles as a function of distance from the surface of solid particles. We examine the effects of finite particle size on the mechanisms of energy production and dissipation. Specifically, the two-way interactions near the channel wall are contrasted with those away from the walls. Results are compared to those based on the point particle approach. We will also discuss how the results change with particle size, particle-to-fluid density ratio, and particle volume fraction.

    Lian-Ping Wang is a professor of Mechanical Engineering and Professor of Physical Ocean Science and Engineering at the University of Delaware.  Dr. Wang received his B.S. in Mechanics from Zhejiang University, China in 1984, Ph.D. in Mechanical Engineering from Washington State University in 1990 and did post-doctoral work in turbulent dispersed flows and turbulence physics at Brown University and Pennsylvania State University before joining University of Delaware in 1994. He held visiting appointments at National Center for Atmospheric Research in the US, Chinese Academy of Sciences, Peking University, and is currently a Chang Jiang visiting professor of Huazhong University of Science and Technology. Dr. Wang uses advanced simulation tools and theoretical methods to study multiphase flows and transport in engineering applications and environmental processes. His research covers direct and large-eddy simulations of turbulence and particle-laden flows, modeling and parameterizations of dispersion and turbulent collision of inertial particles, and simulation of interfacial multiphase flows. He explores the use of lattice Boltzmann, pseudo-spectral, and finite-difference / finite-volume methods for a variety of applications, as well as their scalable implementations on PetaScale computers.  Dr. Wang is a Fellow of American Physical Society and his honors include UD's junior-faculty Outstanding Teaching Award in 1996, UD's Francis Alison Young Scholars Award in 1998, NCAR Faculty Fellowship in 2005, Distinguished Oversea Scholar Award from China in 2006, and Top-50 Most Cited Articles in Atmospheric Research in 2010 and 2011.

 

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