弗吉尼亞理工大學Danesh Tafti教授學術報告會 Academic Lecture by Prof. Danesh Tafti at Virginia Polytechnic Institute and State University-腾讯欢乐炸金花
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弗吉尼亞理工大學Danesh Tafti教授學術報告會 Academic Lecture by Prof. Danesh Tafti at Virginia Polytechnic Institute and State University
發布時間:2018年06月22日 16:29 作者: 點擊量:

報告人:Danesh Tafti教授

Speaker: Prof. Danesh Tafti

主持人:劉波教授

Host: Prof. Bo Liu

時間:201873日(星期二) 下午200

Time:  2:00pm-4:00pm, July 3, 2018

地點:長安校區動力與能源學院大樓225會議室

Place: Conference room 225, School of Power and Energy

題: 采用粒子解析模擬的非球體粒子組合中流體力和傳熱問題的研究

Topic:  Fluid Forces and Heat Transfer in Non-Spherical Particle Assemblies using Particle Resolved Simulations

內容簡介: 氣固兩相流動在許多工業過程中至關重要。為了掌握該類係統中相間動量和熱量的傳遞問題,過去已經開展了大量的實驗和數值研究,且大多數的研究集中在球形顆粒的形狀方麵。 然而,在大多數自然和工業過程中,顆粒的形狀很少是球形的,且顆粒形狀對動量、傳熱和傳質均有顯著的影響,而這在工業過程中非常重要。在該研究中,采用粒子解析方法來研究一個給定的隨機組合橢球粒子(球度為 0.887)流中的動量和傳熱問題。利用浸沒邊界法(IBM)求解不可壓縮Navier -Stokes方程,開發了一個采用粒子解析仿真研究任意形狀粒子集合流動的完整框架係統。且研究了球形和橢球形粒子的阻力問題,定量地給出了橢球粒子集合中升力、側向力和力矩大小以及它們的變化,結果表明,在一定條件下這些力和力矩均不能忽略,而通常情況下它們會被忽略不計。此外,還研究了橢球粒子集合的傳熱問題並提出了對應的相關性。

Introduction: Gas-solid flows are fundamental to many industrial processes. Extensive experimental and numerical studies have been devoted to understand the interphase momentum and heat transfer in these systems. Most of the studies have focused on spherical particle shapes. However, in most natural and industrial processes, the particle shape is seldom spherical and the shape can have a significant impact on momentum, heat and mass transfer, which are fundamental to all processes. In this study particle-resolved simulations are performed to study momentum and heat transfer in flow through a fixed random assembly of ellipsoidal particles with sphericity (ψ=0.887). The incompressible Navier-Stokes equations are solved using the Immersed Boundary Method (IBM). A complete framework using particle-resolved simulations to study the assembly of particles with any shape is developed. The drag force of spherical and ellipsoidal particles is investigated. The lift force, lateral force and torque of ellipsoidal particles in assembly and their variations are quantitatively presented and it is shown that under certain conditions these forces and torques cannot be neglected as is commonly done. The heat transfer in assembly of ellipsoidal particle is also investigated, and a correlation is proposed.



報告人簡介

Speaker’s Biography

Danesh Tafti教授是弗吉尼亞理工大學機械工程係的William S. Cross ProfessorASME會士,ASME J. Heat Transfer期刊副主編,Int. J. Heat and Fluid Flow期刊編委,已公開發表期刊文章超過220篇,並被多次邀請在國內和國際會議上發表演講。Danesh Tafti教授於1989年於賓夕法尼亞州立大學機械工程係取得博士學位。經過兩年的博士後工作,Danesh Tafti教授加入了伊利諾伊大學厄本那香檳分校的國家超級計算應用中心(NCSA),擔任研究科學家、高級研究科學家和副主任的職位。Danesh Tafti教授於2002年加入弗吉尼亞理工大學機械工程係,負責管理高性能計算流體熱科學與工程實驗室,並於2009年被提名為William S. professorDanesh Tafti教授在2008-2012年期間擔任係晉升和任期委員會主席,20142015年間擔任代理係主任。Danesh Tafti教授的研究方向包括推進、能源和生物係統領域中的單相、多相係統的高端、多尺度、多物理場的仿真模擬。


Danesh Tafti is the William S. Cross Professor in the Department of Mechanical Engineering at Virginia Tech. He obtained his Ph.D. from the Mechanical Engineering Department at Penn State University in 1989. After two years of post-doctoral work he joined the National Center for Supercomputing Applications (NCSA) at the University of Illinois at Urbana-Champaign, where he held positions of Research Scientist, Senior Research Scientist, and Associate Director. He joined the Mechanical Engineering Department at Virginia Tech in 2002 where he directs the High Performance Computational Fluid-Thermal Science and Engineering Lab. In 2009, he was named the William S. Cross Professor of Engineering. He has served as the Chair of the departmental promotion and tenure committee from 2008-2012 and as the Interim Department Head from 2014 to 2015.   His research interests are in high-end, multiscale, multiphysics simulations of single and multiphase systems in the broad areas of propulsion, energy and biological systems. He has over 220 peer reviewed publications to his credit and has given several invited, keynote, and plenary lectures at national and international conferences. He is a Fellow of ASME, Associate Editor of ASME J. Heat Transfer and editorial board member of the Int. J. Heat and Fluid Flow.