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arXiv 1902.07274math.NAcs.NA
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一种用于构造第三阶WENO权重的通用框架

A generalized framework to construct third order WENO weights using weight limiter functions

SRM Institute of Science and Technology(SRM科学技术研究所)

Ritesh Kumar Dubey, Sabana Parvin

AI总结:

本文提出了一种通用框架,用于构造非线性权重以获得非振荡的第三阶WENO方案,通过在权重上施加必要条件来确保非振荡的WENO重建,并分析了新的非线性权重在光滑解区域中的精确第三阶准确性。

摘要:

本文的主要目的是不是改进现有的非线性权重,而是提供一个通用的框架来构造非线性权重以获得非振荡的第三阶WENO方案。通过在权重上施加必要条件来获得非振荡的WENO重建,从而进一步揭示了权重的结构,以确保不发生振荡并为第三阶精度表征解区域。该WENO权重框架是全新的,与现有的方法完全不同。新的非线性权重是通过称为权重限制函数的平滑度参数函数设计的。给出了许多这样的权重限制函数并进行了分析。这些新权重简单,并通过构造保证在光滑解区域中包括远离临界点的光滑极值处的精确第三阶准确性。给出了各种测试问题的数值结果并进行比较。结果表明,所提出的权重在不丢失所得到方案的非振荡激波捕捉能力的情况下提供了第三阶准确性。

英文摘要:

The main aim of this work is not to improve any existing non-linear weight but to give a generalized framework for the construction of non-linear weights to get non-oscillatory third order WENO schemes. It is done by imposing necessary conditions on weights to get non-oscillatory WENO reconstruction which give further insight on the structure of weights to ensure non-occurrence of oscillations and characterize the solution region for third order accuracy. This framework for WENO weights is new and completely different from the prevailing existing approach. New non-linear weights are designed using a function of smoothness parameter termed as weight limiter functions. Many such weight limiter functions are given and analyzed. These new weights are simple and by construction guarantee for exact third order accuracy in smooth solution region including smooth extrema away from critical point. Numerical results for various test problems are given and compared. Results show that proposed weights give third order accuracy without loosing the non-oscillatory shock capturing ability of the resulting scheme.

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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