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arXiv 1902.07513math.APcs.NAmath.NA
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关于数值粘性在非局部守恒律局部极限研究中的作用

On the role of numerical viscosity in the study of the local limit of nonlocal conservation laws

EPFL(洛桑联邦理工学院);Universität Basel(巴塞尔大学);University of Auckland(奥克兰大学);IMATI-CNR(意大利国家研究委员会应用数学研究所)

Maria Colombo, Gianluca Crippa, Marie Graff, Laura V. Spinolo

AI总结:

本文研究了非局部守恒律局部极限的数值研究中数值粘性的作用,指出数值粘性可能影响数值方案的可靠性,并通过实验验证了不同数值方案在不同情况下的表现。

摘要:

我们研究了非局部守恒律局部极限的数值研究。先前的数值实验表明在局部极限下收敛。然而,最近的解析结果指出(i)一般情况下收敛不成立,因为可以构造反例;(ii)在局部和非局部方程中加入粘性可恢复收敛。受这些解析结果的启发,我们研究了数值粘性在非局部守恒律局部极限的数值研究中的作用。特别是,我们证明了Lax-Friedrichs型方案的数值粘性会危及数值方案的可靠性,并在解析结果排除收敛的情况下错误地检测到收敛。我们还测试了Godunov型方案,这些方案受数值粘性影响较小,并在某些情况下提供了更可靠的结果。

英文摘要:

We deal with the numerical investigation of the local limit of nonlocal conservation laws. Previous numerical experiments suggest convergence in the local limit. However, recent analytic results state that (i) in general convergence does not hold because one can exhibit counterexamples; (ii) convergence can be recovered provided viscosity is added to both the local and the nonlocal equations. Motivated by these analytic results, we investigate the role of numerical viscosity in the numerical study of the local limit of nonlocal conservation laws. In particular, we show that the numerical viscosity of Lax-Friedrichs type schemes jeopardizes the reliability of the numerical scheme and erroneously detects convergence in cases where convergence is ruled out by analytic results. We also test Godunov type schemes, less affected by numerical viscosity, and show that in some cases they provide more reliable results.

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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