应能动学院张楚华教授邀请，伊利诺伊大学香槟分校土木与环境工程系刘海湖（Haihu Liu）博士于2013年6月5日-9日来访我校。访问期间，双方就落实研究兴趣交叉点、合作指导研究生等深入交换了意见，取得了重要共识。刘博士的学术报告吸引了50余名师生，其坦率、直接、高效的回答问题风格给我们留下了深刻印象。
讲座内容：Modeling and simulation of multiphase displacement behavior in porous media using the lattice Boltzmann method
讲座时间：2013年6月7日（周五）下午15:00 – 17:00
讲座地点：东三楼二楼东汽报告厅
刘海湖博士简介：
刘海湖分别于2004年、2007年获西安交通大学能源与动力工程学院流体机械及工程系学士、硕士学位，随后赴英国Strathclyde大学机械工程系留学，并于2011年1月获该校博士学位，2011年3月至今在美国伊利诺伊大学香槟分校从事博士后研究工作。研究兴趣主要有：多相物理LBM模型与计算；微液滴/气泡动力学；多孔介质中的复杂多相反应流动等，目前研究重点是二氧化碳地下封存、页岩气开采中的空隙尺度多相迁移过程。已在流动物理、计算物理顶级期刊Physical Review E, Journal of Computational Physics, Physics of Fluids等上发表10余篇学术论文
。刘博士尤其在多相流动LBM模型与计算方面积累了丰厚的实践经验，几乎测试过所有的主流多相流LBM模型的计算性能。
Brief Introduction to Dr. Haihu Liu
Dr. Liu received his Bachelor degree in 2004 and Master degree in 2007 in School of Energy and Power Engineering, Xi’an Jiaotong University. In January 2011, he received his Doctorate in Mechanical Engineering, University of Strathclyde, United Kingdom. During his PhD study, he worked on multiscale modeling and simulation of droplet dynamics in microfluidic devices. Since March 2011, Dr. Liu has been working as a postdoc with Professor Valocchi in Department of Civil and Environmental Engineering,
University of Illinois at Urbana-Champaign, USA. Currently, he is working on pore-scale simulation of multiphase displacement in porous media with its application in CO2 sequestration. Dr. Liu’s research interests include lattice Boltzmann multiphysics modeling, microdroplet/bubble dynamics in microfluidic devices, and complex multiphase and reactive flows in porous media. Dr. Liu has published more than 10 papers in top journals including Physical Review E, Journal of Computational Physics, Physics of Fluids and others.
Abstract:
Immiscible fluid displacement in porous media affects numerous industrial and technological applications such as enhanced oil recovery, geologic CO2 sequestration, and remediation of nonaqueousphase liquids. The physical mechanism and the dynamics of this process are still poorly understood because a large number of factors influence the multiphase flows at pore scale, including fluid density and viscosity, surface tension, fluid flow rates, surface wettability, and pore geometry and medium heterogeneity. Numerical modelling and simulations can be very instrumental in enhancing our understanding of pore-scale displacement. In particular, the lattice Boltzmann (LB) method is employed due to its kinetic nature and ability of handling complex geometries with ease. While it is challenging to use LB method for simulation of multiphase flows with high density and viscosity ratios in complicated porous media, we will present our recently developed color-fluid LB model. We first demonstrate that this model allows us to simulate accurately immiscible binary fluids with large differences in density and viscosity. We then use this model to simulate the liquid CO2(LCO2) displacement of brine in pore network micromodel with two distinct permeability zones. Our simulation results are compared with previous experimental results and good agreement is obtained. Finally, we numerically simulate non-wetting CO2 displacing brine in various heterogeneous pore networks, and focus on studying the influence of geometry of porous media on drainage behavior. Our numerical results indicate that the standard deviation for grain size distribution, mean grain radius, and porosity all play a nontrivial role in characterization of multiphase displacement behavior in porous media.
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