Influence of wall motion on particle sedimentation using hybrid LB-IBM scheme  

作　　者：Mussie A. Habte ChuiJie Wu 

机构地区：[1]School of Aeronautics and Astronautics, Dalian University of Technology, Dalian 116024, China [2]State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian 116024, China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2017年第3期55-73,共19页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant No.11372068);the National Key Basic Research and Development Program of China(Grant No.2014CB744104)

摘　　要：We integrate the lattice Boltzmann method(LBM) and immersed boundary method(IBM) to capture the coupling between a rigid boundary surface and the hydrodynamic response of an enclosed particle laden fluid. We focus on a rigid box filled with a Newtonian fluid where the drag force based on the slip velocity at the wall and settling particles induces the interaction. We impose an external harmonic oscillation on the system boundary and found interesting results in the sedimentation behavior. Our results reveal that the sedimentation and particle locations are sensitive to the boundary walls oscillation amplitude and the subsequent changes on the enclosed flow field. Two different particle distribution analyses were performed and showed the presence of an agglomerate structure of particles. Despite the increase in the amplitude of wall motion, the turbulence level of the flow field and distribution of particles are found to be less in quantity compared to the stationary walls. The integrated LBM-IBM methodology promised the prospect of an efficient and accurate dynamic coupling between a non-compliant bounding surface and flow field in a wide-range of systems. Understanding the dynamics of the fluid-filled box can be particularly important in a simulation of particle deposition within biological systems and other engineering applications.We integrate the lattice Boltzmann method （LBM） and immersed boundary method （IBM） to capture the coupling between a rigid boundary surface and the hydrodynamic response of an enclosed particle laden fluid, We focus on a rigid box filled with a Newtonian fluid where the drag force based on the slip velocity at the wall and settling particles induces the interaction. We impose an external harmonic oscillation on the system boundary and found interesting results in the sedimentation behavior. Our results reveal that the sedimentation and particle locations are sensitive to the boundary walls oscillation amplitude and the subsequent changes on the enclosed flow field. Two different particle distribution analyses were performed and showed the presence of an agglomerate structure of particles. Despite the increase in the amplitude of wall motion, the turbulence level of the flow field and distribution of particles are found to be less in quantity compared to the stationary walls. The integrated LBM-IBM methodology promised the prospect of an efficient and accurate dynamic coupling between a non-compliant bounding surface and flow field in a wide-range of systems. Understanding the dynamics of the fluid-filled box can be particularly important in a simulation of particle deposition within biological systems and other engineering applications.

关 键 词：particle collisions lattice Boltzmann method immersed boundary method hard sphere molecular dynamics harmoni coscillation 

分 类 号：O35[理学—流体力学] TQ534[理学—力学]