在半离散和全离散格式下对一类非线性色散耗散波动方程给出了Hermite型有限元方法.利用已有高精度结果和插值后处理技巧,分别导出了超逼近和整体超收敛,通过构造新的辅助问题,得到了四阶精度的外推解.
An Hermite-type finite element method is proposed for a class of nonlinear dispersion-- dissipative wave equations under semi-discrete and fully-discrete schemes. Based on the known high accurary result and interpolation post-processing technique,the superclose and global superconver- gence are derived, respectively. Besides, the fourth-order extrapolation solution is deduced through constructing a new suitable auxiliary problem.