arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.06747math.NAcs.NA
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精度阶数逼近间断点的新WENO-2 r算法

A new WENO-2r algorithm with progressive order of accuracy close to discontinuities

Sergio Amat, Juan Ruiz, Chi-Wang Shu, Dionisio F. Yanez

摘要:

在这篇文章中,我们提出了一个修改的算法,数据离散化的点值在[S。Amat,J. Ruiz,C. W. Shu,在一个新的WENO算法的顺序2 r与改进的精度接近不连续,应用数学快报。105(2020),106-298]。在上述工作中,我们设法获得了一种算法,该算法达到了接近WENO-6不连续性的渐进和最佳精度顺序。对于更高的订单,即WENO-8,WENO-10等,我们已经发现,以前的算法提出了一些阴影在检测的不连续性,这意味着该顺序的准确性是优于一个达到WENO相同的顺序,但不是最佳的。在这篇文章中,我们提出了一个修改的平滑指标,在原来的算法中使用,面向解决这个问题,并达到一个WENO-2 r算法的准确性接近的不连续性的累进顺序。我们还提出了证明的准确性和明确的公式,用于任何顺序2 r的算法的所有权重。

英文摘要:

In this article we present a modification of the algorithm for data discretized in the point values introduced in [S. Amat, J. Ruiz, C.-W. Shu, On a new WENO algorithm of order 2r with improved accuracy close to discontinuities, App. Math. Lett. 105 (2020), 106-298]. In the aforementioned work, we managed to obtain an algorithm that reaches a progressive and optimal order of accuracy close to discontinuities for WENO-6. For higher orders, i.e. WENO-8, WENO-10, etc. We have found that the previous algorithm presents some shadows in the detection of discontinuities, meaning that the order of accuracy is better than the one attained by WENO of the same order, but not optimal. In this article we present a modification of the smoothness indicators used in the original algorithm, oriented to solve this problem and to attain a WENO-2r algorithm with progressive order of accuracy close to the discontinuities. We also present proofs for the accuracy and explicit formulas for all the weights used for any order 2r of the algorithm.

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