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arXiv 1811.02499math.NAcs.NA
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一种局部时间步进的高阶保守积分器

A high-order, conservative integrator with local time-stepping

William Throwe, Saul A. Teukolsky

摘要:

我们提出了一族基于Adams-Bashforth方法的多步积分器。这些格式可以构造为任意收敛阶和任意步长变化。系统的不同子域之间的步长可以不同。它也可以在给定子域内随时间变化。该方法是线性保守的,保持了广泛的一类解析常数的数值循环,即使当数值截断误差显着较高。这些方法用于求解不连续Galerkin公式中的保守偏微分方程或具有紧拉伸的有限差分法。数值试验证明了这些属性,并表明,显着的速度提高了标准的亚当斯-Bashforth计划可以得到。

英文摘要:

We present a family of multistep integrators based on the Adams-Bashforth methods. These schemes can be constructed for arbitrary convergence order with arbitrary step size variation. The step size can differ between different subdomains of the system. It can also change with time within a given subdomain. The methods are linearly conservative, preserving a wide class of analytically constant quantities to numerical roundoff, even when numerical truncation error is significantly higher. These methods are intended for use in solving conservative PDEs in discontinuous Galerkin formulations or in finite-difference methods with compact stencils. A numerical test demonstrates these properties and shows that significant speed improvements over the standard Adams-Bashforth schemes can be obtained.

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