报告题目：Direct Numerical Simulations：Revealing the Nature of Complex Multiphase Flows
报告人：Dr Prashant Valluri （University of Edinburgh, UK）
时间:2013年8月23日 下午 16:00-17:00
地点:力学一楼237
Multiphase flows are ubiquitous in the environment around us, industry and within our bodies. With the availability of super computing clusters, Direct Numerical Simulations (DNS) are rapidly becoming the most important tool to study multiphase flows revealing flow phenomena at unprecedented detail for a variety of applications. These apply to difficult and diverse problems in the energy (e.g. flows in long-distance oil-gas pipelines, refinery distillation columns, amine absorption in post-combustion carbon capture, liquid cooling of microelectronic devices), environment (e.g. cleaning in process plants, water treatment) and health (e.g. brain cooling) sectors. In this talk I will focus on three industrial examples demonstrating the rigorous DNS and analytical tools that my group has developed, discuss some new physical insights that are being revealed and how these might significantly affect the engineering design. I will also introduce a newly launched open-source Two-Phase Level Set (TPLS) Solver that has been developed in collaboration with University College Dublin, Edinburgh Parallel Computing Centre and Université de Lyon 1. TPLS is a highly advanced 3D DNS flow solver to simulate single/ multiphase flows at unprecedented detail, speed and accuracy. The solver has been optimized and means-tested on the UK’s national super computing service, HECToR.
Dr Prashant Valluri (PV) is a Lecturer in Engineering at the Institute for Materials and Processes at the University of Edinburgh since October 2009. He received his PhD (2004) in Chemical Engineering from Imperial College London. He received his BTech (1998) in Chemical Engineering degree from Dr BA Technological University in India. His area of expertise is in modeling transient multiphase flows using theoretical and numerical techniques. His research interests lie in understanding the dynamics of unsteady multiphase flows via development of bespoke numerical and analytical modeling methods. These include turbulence, stability theory, combined heat-mass-momentum transport such as flows with phase change, and flows with mass-transfer and interfacial-reactions. Specifically, he has co-developed parallelized two-phase flow solvers using interface capturing methods including level-set and diffuse-interface techniques and theoretical methods such as stability analyses to understand interfacial instabilities. These have been employed towards understanding flow phenomena in several industrial applications including oil-gas pipeline flows, oil-hydrate subsea pipeline flows, microelectronic cooling and post-combustion carbon capture.