Lattice Boltzmann simulations of a dumbbell moving in a Poiseuille flow  

作　　者：伊厚会 陈艳燕 李华兵 

机构地区：[1]Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China [2]Graduate School of the Chinese Academy of Sciences, Beijing 100080, China [3]Department of Information Material Science and Engineering, Guilin University of Electronic Technology, Guilin 541004, China

出　　处：《Chinese Physics B》2007年第8期2444-2448,共5页中国物理B（英文版）

基　　金：Project supported by the National Natural Science Foundation of China （Grant Nos 10474109 and 10447001） and the Foundation of Ministry of Personnel of China. We thank Professor Haiping Fang, and Dr Lijuan Zhang for helpful discussions and Shanghai Supercomputer Centre of China for support of the computation.

摘　　要：In this paper, the lattice Boltzmann method is applied to simulate a dumbbell moving in a pressure-driven flow in a planar channel with the stress-integration method for the evaluation of hydrodynamic force acting on the cylinders. The simulation results show that the dumbbell also has the important feature of the Segr^-Silberberg effect like a particle in a Poiseuille flow. The dumbbell trajectories, orientations, the cylinders vertical velocities and angular velocities all reach their equilibrium values separately independent of their initial positions. It is also found that the dumbbell equilibrium positions depend on the flow Reynolds number, blockage ratio and elastic coefficient. This study is expected to be helpful to understand the dynamics of polymer solutions, polymer synthesis and reaction, etc.In this paper, the lattice Boltzmann method is applied to simulate a dumbbell moving in a pressure-driven flow in a planar channel with the stress-integration method for the evaluation of hydrodynamic force acting on the cylinders. The simulation results show that the dumbbell also has the important feature of the Segr^-Silberberg effect like a particle in a Poiseuille flow. The dumbbell trajectories, orientations, the cylinders vertical velocities and angular velocities all reach their equilibrium values separately independent of their initial positions. It is also found that the dumbbell equilibrium positions depend on the flow Reynolds number, blockage ratio and elastic coefficient. This study is expected to be helpful to understand the dynamics of polymer solutions, polymer synthesis and reaction, etc.

关 键 词：lattice Boltzmann method DUMBBELL 

分 类 号：O4[理学—物理]