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arXiv 1707.09294math.NAcs.NA
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基于核的高阶显式无条件稳定方案用于非线性退化对流-扩散方程

Kernel Based High Order "Explicit" Unconditionally-Stable Scheme for Nonlinear Degenerate Advection-Diffusion Equations

Michigan State University(密歇根州立大学);Texas Tech University(德克萨斯理工大学)

Andrew Christlieb, Wei Guo, Yan Jiang

AI总结:

本文提出一种新的数值方案,用于求解一类非线性退化抛物方程,采用基于核的公式和高阶WENO方法,实现高阶时间精度和无条件稳定性,提升计算效率。

摘要:

本文提出了一种新的数值方案,用于求解一类非线性退化抛物方程,该方案基于我们早期工作中方法的转置和连续卷积的特殊核公式。在该框架下,采用高阶加权本质非振荡(WENO)方法和非线性滤波器以避免伪振荡。通过使用高阶显式强稳定性保持(SSP)Runge-Kutta方法实现高阶时间精度。结合基于核的公式和显式SSP方法的理论研究表明,该联合方案具有无条件稳定性和高达三级精度。通过快速$\mathcal{O}(N)$求和算法评估基于核的方法。新方法允许比具有相同阶精度的其他显式方案更大的时间步长,从而带来显著的计算节省。

英文摘要:

In this paper, we present a novel numerical scheme for solving a class of nonlinear degenerate parabolic equations with non-smooth solutions. The proposed method relies on a special kernel based formulation of the solutions found in our early work on the method of lines transpose and successive convolution. In such a framework, a high order weighted essentially non-oscillatory (WENO) methodology and a nonlinear filter are further employed to avoid spurious oscillations. High order accuracy in time is realized by using the high order explicit strong-stability-preserving (SSP) Runge-Kutta method. Moreover, theoretical investigations of the kernel based formulation combined with an explicit SSP method indicates that the combined scheme is unconditionally stable and up to third order accuracy. Evaluation of the kernel based approach is done with a fast $\mathcal{O}(N)$ summation algorithm. The new method allows for much larger time step evolution compared with other explicit schemes with the same order accuracy, leading to remarkable computational savings.

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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