将非协调类Wilson元应用于伪双曲方程。借助于双线性元已有的高精度结果、平均值和插值后处理技巧,导出了半离散格式下O(h2)阶的超逼近性质和整体超收敛结果。结合类Wilson元相容误差在能量范数意义下可达到O(h3)阶的特殊性质,应用外推方法,得到了具有O(h3)阶精度的外推解。给出了全离散逼近格式在能量范数意义下的最优误差估计式。
A quasi-Wilson finite element method is applied to a class of pseudo-hyperbolic equations. Firstly, employing the known high accuracy analysis of the bilinear element, mean-value approach and post-processing technique, the superclose property and the global superconvergence result with the order O (h2) are obtained for semi-discrete scheme. Secondly, combining a special character of the quasi-Wilson element that the consistency error can reach to order O( h3 ) in broken H1 -norm and extrapolation method, the extrapolation solution with the order O( h3) iS presented. Finally, the optimal order error estimate is deduced in broken H1 -norm for fully-discrete scheme.