A SECOND ORDER MODIFIED CHARACTERISTICS VARIATIONAL MULTISCALE FINITE ELEMENT METHOD FOR TIME-DEPENDENT NAVIER-STOKES PROBLEMS  

作　　者：Zhiyong Si Jian Su Yinnian He 

机构地区：[1]School of Mathematics and Information Science, Henan Polytechnic University, Jiaozuo 454003, China [2]Center for Computational Geosciences, School of Mathematics and Statistics, Xi 'an Jiaotong University, Xi'an 710049, China

出　　处：《Journal of Computational Mathematics》2013年第2期154-174,共21页计算数学（英文）

摘　　要：In this paper, by combining the second order characteristics time discretization with the variational multiscale finite element method in space we get a second order modified characteristics variational multiscale finite element method for the time dependent Navier- Stokes problem. The theoretical analysis shows that the proposed method has a good convergence property. To show the efficiency of the proposed finite element method, we first present some numerical results for analytical solution problems. We then give some numerical results for the lid-driven cavity flow with Re = 5000, 7500 and 10000. We present the numerical results as the time are sufficient long, so that the steady state numerical solutions can be obtained.In this paper, by combining the second order characteristics time discretization with the variational multiscale finite element method in space we get a second order modified characteristics variational multiscale finite element method for the time dependent Navier- Stokes problem. The theoretical analysis shows that the proposed method has a good convergence property. To show the efficiency of the proposed finite element method, we first present some numerical results for analytical solution problems. We then give some numerical results for the lid-driven cavity flow with Re = 5000, 7500 and 10000. We present the numerical results as the time are sufficient long, so that the steady state numerical solutions can be obtained.

关 键 词：Modified method of characteristics Defect-correction finite element method Navier-Stokes problems Characteristics-based method Lid-driven problem. 

分 类 号：O351.3[理学—流体力学] O241.82[理学—力学]