摘要
通过利用Crouzeix-Raviart元({1,x,y}),旋转元({1,x,y,x^2-y^2}),拓广旋转元({1,x,y,x^2,y^2})以及拓广Crouzeix-Raviart元({1,x,y,x^2+y^2})这四种混合有限元(参看正文中示图)来提供求Stokes特征值下界的方法.并找到恰当的理论框架,重要的是证明不仅统一,而且出奇的短,仅需几行.最后给出相关的数值结果来验证本文的理论分析.
We provide the lower bounds of Stokes eigenvalue by using 4 nonconforming mixed finite elements:Crouzeix-Raviart({1,x,y}),Q_1^(rot)({1,x,y,x^2 - y^2}),extension Q_1^(rot) ({1,x,y,x^2,y^2}) and extension Crouzeix-Raviart({1,x,y,x^2 +y^2}).We find a suitable theoretical framework which makes the proof unified and surprisingly short,with a few steps only! Some numerical results are used to confirm the theoretical tonvergence results.
出处
《数学的实践与认识》
CSCD
北大核心
2010年第19期157-168,共12页
Mathematics in Practice and Theory
关键词
Stokes特征值
下界逼近
非协调混合有限元
Stokes eigenvalue problem
approximation from below
nonconforming mixed finite element