arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 2109.07033math.NAcs.NA
收藏

四阶半线性wave equations的基于局部能量的间断Galerkin方法

A local energy-based discontinuous Galerkin method for fourth order semilinear wave equations

Lu Zhang

摘要:

本文将二阶波动方程基于能量的间断Galerkin方法推广到四阶半线性波动方程。我们首先将问题转化为一个具有二阶空间导数的系统,然后将基于能量的间断Galerkin方法应用于该系统。一方面,与局部间断Galerkin方法相比,所提出的格式由于较少的辅助变量而具有更高的计算效率。另一方面,它是无条件稳定的,不添加任何惩罚项,并承认在$L^2$范数下的最优收敛的解决方案和辅助变量。此外,该方案的能量耗散或能量守恒属性来自于简单的、与网格无关的单元间通量的选择。我们还提出了一个稳定性和收敛性分析,以及数值实验,以证明最佳的收敛性的某些选择的元素间通量。

英文摘要:

This paper generalizes the earlier work on the energy-based discontinuous Galerkin method for second-order wave equations to fourth-order semilinear wave equations. We first rewrite the problem into a system with a second-order spatial derivative, then apply the energy-based discontinuous Galerkin method to the system. The proposed scheme, on the one hand, is more computationally efficient compared with the local discontinuous Galerkin method because of fewer auxiliary variables. On the other hand, it is unconditionally stable without adding any penalty terms, and admits optimal convergence in the $L^2$ norm for both solution and auxiliary variables. In addition, the energy-dissipating or energy-conserving property of the scheme follows from simple, mesh-independent choices of the interelement fluxes. We also present a stability and convergence analysis along with numerical experiments to demonstrate optimal convergence for certain choices of the interelement fluxes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑