文献类型：期刊文献

中文题名：黏弹性流体扩展及收缩流动的格子Boltzmann模拟分析

英文题名：Simulation of Sudden Expansion and Contraction Flows for Viscoelastic Fluids Using the Lattice Boltzmann Method

作者：周王军[1];李勇[1];何录武[1]

机构：[1]华东理工大学机械与动力工程学院,上海200237

年份：2018

卷号：39

期号：2

起止页码：395

中文期刊名：力学季刊

外文期刊名：Chinese Quarterly of Mechanics

收录：CSTPCD;;北大核心:【北大核心2017】；CSCD:【CSCD_E2017_2018】；

基金：国家自然科学基金(11372111)

语种：中文

中文关键词：格子玻尔兹曼方法(LBM);黏弹性流体;扩展/收缩流;雷诺数;维森伯格数;黏度

外文关键词：LBM;viscoelastic fluid;sudden expansion/contraction flow;Reynolds number;Weissenberg number;viscosity

摘要：本文应用格子Boltzmann方法(LBM)并结合Oldroyd-B模型,讨论了不可压缩的Navier-Stokes方程和平流扩散本构方程的解耦及各自求解方法,以及两类问题的边界处理格式,实现了黏弹性流体在二维1:3扩展流道以及3:1收缩流道中的流动的数值模拟.获得了不同雷诺数Re和维森伯格数Wi以及黏度vs下流动的流线分布,计算给出了漩涡的涡心位置和大小,并分析了参数Re、Wi和vs对流动特点的影响.模拟结果表明本文所采用模型和边界处理方法具有良好的精度和稳定性.
In this paper, based on the lattice Boltzmann method（LBM） and the Oldroyd-B model, the plane 1：3 and 3：1 sudden expansion and contraction flow of viscoelastic fluid was studied numerically, the decoupling and solving methods of the incompressible Navier-Stokes equation and advection diffusion constitutive equations were discussed and the boundary processing format was given. The streamline patterns for sudden expansion and contraction flow of viscoelastic fluid with different Reynolds numbers Re, Weissenberg numbers Wi and viscosity vs were obtained. The positions of vortex center and the length of vortex were also listed, and the influences of those parameters on the sudden expansion and contraction flow were discussed. The results also confirmed that this method has satisfactory accuracy and stability.