标题:
求解不可压缩Navier-Stokes方程的GLS平面八节点单元The Planar Element with Eight Nodes for Solving Incompressible Navier-Stokes Equations
作者:
魏晓娟, 刘力菱, 谢凌志, 易丽清, 魏泳涛
关键字:
Galerkin/最小二乘有限元, 稳定因子, 单元长度, 逆估计常数Galerkin/Least Squares FEM; Stabilization Factor; Element Length; Inverse Estimate Constant
期刊名称:
《International Journal of Fluid Dynamics》, Vol.1 No.2, 2013-06-18
摘要:
给出了求解不可压缩Navier-Stokes方程的GLS平面八节点单元的“单元长度”的定义和相应的逆估计常数，由此可计算出该单元的GLS稳定因子。给出的“单元长度”只依赖单元形状且易于计算；各种形状的直边四边形单元的逆估计常数的最大值由遗传算法得出。对Reynolds数为20,000的方腔上盖板流的数值模拟表明，本文所提出的单元长度和逆估计常数的正确性。
The definition of the element length and the inverse estimate constant of straight-edged quadrilateral element with eight nodes for solving incompressible Navier-Stokes equations was proposed, based on this, the stabilization factor was readily calculated. The element length was only dependent on the quadrilateral geometry and easy to compute, and the largest inverse estimate constant among various quadrilateral was obtained by means of the optimization method of genetic algorithm (GA). The numerical solutions of the classical lid-driven cavity flow problem were ob- tained for Reynolds number of 20,000 which demonstrated the validity of the element length and the inverse estimate constant proposed.