正则性假设或拟一致条件是进行有限元理论分析的基本假设,本文在不满足该假设的条件下,采用一种更简便的方法给出了双线性元在求解二阶问题时的超逼近结果;在此基础上,又得到了其在中心点的点态超收敛结果;最后的数值试验验证了理论分析的正确性.
Regular assumption or quasi-uniform assumption is a basic condition in theoretical analysis of finite element. In this paper, the superclose result and a superconvergence estimate on the central point of element are obtained by using a new simple method without the regularity assumofion and quasi-uniform assumption. Lastly, a numerical test is carried out which coincides with our theoretical analysis.