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arXiv 1906.09736math.NAcs.NA
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基于双网格的不定常偏微分方程自适应本征正交分解算法

Two-Grid based Adaptive Proper Orthogonal Decomposition Algorithm for Time Dependent Partial Differential Equations

Xiaoying Dai, Xiong Kuang, Jack Xin, Aihui Zhou

摘要:

本文提出了一种基于双网格的自适应本征正交分解(POD)方法来求解不定常的偏微分方程。基于在粗网格中获得的误差,我们提出了一个误差指标,在细网格中获得的数值解。新算法成本低,易于实现.我们应用我们的新方法的时间依赖的对流-扩散方程与Kolmogorov流和ABC流的解决方案。数值结果表明,我们的方法是更有效的比现有的POD方法。

英文摘要:

In this article, we propose a two-grid based adaptive proper orthogonal decomposition (POD) method to solve the time dependent partial differential equations. Based on the error obtained in the coarse grid, we propose an error indicator for the numerical solution obtained in the fine grid. Our new algorithm is cheap and easy to be implement. We apply our new method to the solution of time-dependent advection-diffusion equations with the Kolmogorov flow and the ABC flow. The numerical results show that our method is more efficient than the existing POD methods.

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