计算物理 ›› 2002, Vol. 19 ›› Issue (5): 403-407.

• 论文 • 上一篇    下一篇

求解非定常不可压N-S方程的预处理方法

薛具奎   

  1. 西北师范大学物理与电子工程学院, 甘肃 兰州 730070
  • 收稿日期:2001-03-27 修回日期:2001-09-20 出版日期:2002-09-25 发布日期:2002-09-25
  • 作者简介:薛具奎(1963-),男,甘肃秦安,副教授,博士,主要从事计算流体力学和大气边界层物理的研究.

SOLVERS FOR THE PRECONDITIONED UNSTEADY INCOMPRESSIBLE NAVIER-STOKES EQUATIONS

XUE Ju-kui   

  1. Physics and Electronic Engineering College, Northwestern Normal University, Lanzhou 730070, China
  • Received:2001-03-27 Revised:2001-09-20 Online:2002-09-25 Published:2002-09-25

摘要: 应用预处理技术,对不可压非定常N-S方程使用双时间推进法求解.当沿物理时间层推进时,连续性方程和动量方程沿伪时间方向使用隐式线Gauss-Seidel迭代法求解,对流项采用三阶迎风差分法离散.通过对不同Reynolds数、不同深宽比下非定常驱动腔内流动的模拟,数值研究了预处理法计算非定常不可压粘性流动的收敛特性,分析了沿伪时间层的迭代收敛速度对流场Reynolds数的依赖特征.

关键词: 非定常不可压N-S方程, 预处理, 数值模拟

Abstract: Using the preconditioning technique,the unsteady incompressible Navier-Stokes equations are solved by a dual time stepping method.An implicit line Gauss Seidel relaxation method is designed to advance the equations in pseudotime steps.The convective flux is computed by a flux difference splitting based third order upwind scheme.Based on the numerical simulation for the Lid driven cavity flow at different Reynolds numbers,the convergence characteristics of the preconditioning algorithm for solving incompressible viscous flows is studied numerically.

Key words: unsteady incompressible Navier Stokes equations, preconditioning, numerical simulation

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