,Lattice Boltzmanr dmulation of fluid flows in two-dimenslonal channel with complex geometries

• 作 者: Wen Bing-Hai Liu Hai-Yan Zhang Chao-Ying Wang Qiang
• 机 构: College of Computer Science and Information Engineering, Guangxi Normal University, Guilin 541004, C
• 出 处: 中国物理B（英文版）
• 发表日期: 2009年10期
• 关键词: lattice Boltzmann method complex boundary fluid flow numerical simulation

Boundary conditions(BCs)play an essential role in lattice Boltzmann(LB)simulations.This paper investigatesseveral most commonly applied BCs by evaluating the relative L2-norm errors of the LB simulations for two-dimensional(2-D)Poiseuille flow.It is found that the relative L2-norm error resulting from FHML’s BC is smaller than that fromother BCs as a whole.Then.based on the FHML’s BC,it formulates an LB model for simulating fluid flows in 2-Dchannel with complex geometries.Afterwards,the flows between two inclined plates,in a pulmonary blood vessel andin a blood Vessel with local expansion region,are simulated.The numerical results are in good agreement with theanalytical predictions and clearly show that the model is effective.It is expected that the model can be extended tosimulate some real biologic flows,such as blood flows in arteries,vessels with stenosises,aneurysms and bifurcations,etc.