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arXiv 1109.4480math.NAcs.NA
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阻尼波动方程的高阶显式局部时间步进方法

High-order explicit local time-stepping methods for damped wave equations

University of Basel(巴塞尔大学)

Marcus Grote, Teodora Mitkova

AI总结:

针对阻尼波动方程,基于Adams-Bashforth多步法推导出任意高阶精度的局部时间步进方法,结合对角质量矩阵的有限元空间离散实现完全显式并行计算。

摘要:

局部细化网格对时间依赖波动现象的数值模拟中的显式时间步进方法施加了严格稳定性约束。局部时间步进方法通过精确地在网格最小元素所在位置使用更小的时间步长来克服这一瓶颈。从经典Adams-Bashforth多步法出发,推导出适用于阻尼波动方程的任意高阶精度的局部时间步进方法。当与具有本质对角质量矩阵的有限元空间离散结合时,所得时间推进方案是完全显式的,因此具有内在并行性。连续和间断Galerkin有限元离散的数值实验验证了理论,并说明了这些局部时间步进方法的实用性。

英文摘要:

Locally refined meshes impose severe stability constraints on explicit time-stepping methods for the numerical simulation of time dependent wave phenomena. Local time-stepping methods overcome that bottleneck by using smaller time-steps precisely where the smallest elements in the mesh are located. Starting from classical Adams-Bashforth multi-step methods, local time-stepping methods of arbitrarily high order of accuracy are derived for damped wave equations. When combined with a finite element discretization in space with an essentially diagonal mass matrix, the resulting time-marching schemes are fully explicit and thus inherently parallel. Numerical experiments with continuous and discontinuous Galerkin finite element discretizations validate the theory and illustrate the usefulness of these local time-stepping methods.

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。

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