Accuracy improvement of a multistep splitting method for nonlinear viscous wave equations

Accuracy improvement of a multistep splitting method for nonlinear viscous wave equations
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非线性粘性波方程多步分裂法精度的提高

DOI:
10.1080/00207160.2013.862238
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发表时间:
2014-08
影响因子:
1.8
通讯作者:
邓定文
邓定文
中科院分区:
数学4区
文献类型:
--
作者:
邓定文

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本文重点研究一类非线性粘性方程在两个空间的多步分裂方法,该方法采用二阶后向微分公式(BDF2)结合近似因式分解进行时间积分,并采用二阶中心差分逼近二阶导数进行空间离散。通过离散能量方法,表明该分裂方法对于离散L2-和H1-范数可以在时间和空间上获得二阶精度。此外,为了提高计算效率,我们引入了Richardson外推方法,获得了时间和空间上的四阶外推解。数值实验说明了我们算法的准确性和性能。
This paper focuses on a multistep splitting method for a class of nonlinear viscous equations in two spaces, which uses second-order backward differentiation formula (BDF2) combined with approximation factorization for time integration, and second-order centred difference approximation to second derivatives for spatial discretization. By the discrete energy method, it is shown that this splitting method can attain second-order accuracy in both time and space with respect to the discrete L2- and H1-norms. Moreover, for improving computational efficiency, we introduce a Richardson extrapolation method and obtain extrapolation solution of order four in both time and space. Numerical experiments illustrate the accuracy and performance of our algorithms.
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