通道中串列旋转圆柱的格子Boltzmann-虚拟区域方法的模拟  

Simulation of Flows Around Two Tandem Rotating Cylinders in a Channel Using LB-DF/FD Method

作　　者：聂德明[1,2] 郭晓辉[2] 林建忠[1,2] 

机构地区：[1]浙江大学力学系,浙江杭州310027 [2]中国计量学院,计量测试工程学院,浙江杭州310018

出　　处：《计算物理》2010年第3期381-388,共8页Chinese Journal of Computational Physics

基　　金：浙江省重大科技专项(2008C01024-4)资助项目

摘　　要：通过结合格子Boltzmann方法(LBM)和虚拟区域(Fictitiou sDomain)思想,建立格子Boltzmann-虚拟区域(LB-DF/FD)方法.采用两套网格系统,欧拉网格用于流体,拉格朗日网格用于固体.原有的LBM在计算运动固体的受力方面存在数据振荡,LB-DF/FD方法改进了此缺陷.为验证该方法,模拟圆柱绕流、圆形颗粒在无限长通道中平动及在无限大流场中转动三种情况,结果与其他数值解及理论解符合得很好.利用该方法模拟低雷诺数下通道中串列旋转圆柱周围的流场,分析圆柱间距(g)及雷诺数(Re)对流场结构的影响.给出Re=0.001,0.1和10下,0.2≤g≤8.0的流线结构、圆柱升力、阻力以及力矩等数值结果.结果表明,g对流场的结构及圆柱的受力有显著影响,Re对圆柱阻力及Stokes单元数目的影响较大.An LB-DF/FD method,combined with lattice Boltzmann method （LBM） and direct-forcing/fictitious domain （DF/FD） scheme,is set up for fluid-solid interaction problems.The LB-DF/FD method uses two unrelated meshes to avoid re-meshing procedure.They are Eulerian mesh for the flow domain and Lagrangian mesh for the solid domain.LB-DF/FD method overcomes fluctuations in computation of forces on solid particle in conventional LBM.The method is validated with simulation of flow past a fixed circular cylinder,a circular cylinder moving in an infinite channel or rotating in an infinite field.Flow around two circular cylinders in tandem at low Reynolds numbers is simulated by using LB-DF/FD method.Effects of spacing gap between cylinders （g＊ ） and Renolds number （Re） are investigated.Numerical results including streamlines,lift and drag force and torque exerted on the cylinder,at Re = 0.001,0.1 and 10,0.2≤g≤8.0 are presented.g＊ shows remarkable effect on lift and drag force and torque exerted on cylinders.Stokes cell number and drag force exerted on cylinders depend on Re.

关 键 词：串列圆柱 旋转 格子BOLTZMANN方法 虚拟区域 数值模拟 

分 类 号：O356[理学—流体力学]