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arXiv 1709.04804math.APcs.NAmath.NA
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奇异系统守恒律的 stationary 解的稳定性

Stability of stationary solutions of singular systems of balance laws

Irmar (UMR 6625), Université de Rennes 1(雷恩第一大学 Irmar(联合研究单位6625))

Nicolas Seguin

AI总结:

本文研究了第一类PDE系统的 stationary 解稳定性,考虑了可能包含奇异几何项的情况,通过构建相对熵证明了熵弱解下的稳定性,适用于浅水方程和有限体积方案。

摘要:

本文考虑了第一类PDE系统 stationary 解的稳定性,可能包含奇异几何项,导致不连续通量和非守恒产物。基于流体力学中的例子,假设这些系统具有部分凸熵。首先构造了关联的相对熵,用于比较具有相同几何数据的两个状态。从而证明了某些 stationary 状态在熵弱解中的稳定性。此结果适用于具有地形的浅水方程。此外,该相对熵可用于研究熵稳定且平衡的有限体积方案,并由于这些方法固有的数值耗散,获得离散 stationary 解的渐近稳定性。此分析不依赖于非守恒产物的具体定义,适用于非严格双曲系统,并且在数值方法中是全维度的,使用无结构网格。

英文摘要:

The stability of stationary solutions of first-order systems of PDE's are considered. They may include some singular geometric terms, leading to discontinuous flux and non-conservative products. Based on several examples in Fluid Mechanics, we assume that these systems are endowed with a partially convex entropy. We first construct an associated relative entropy which allows to compare two states which share the same geometric data. This way, we are able to prove the stability of some stationary states within entropy weak solutions. This result applies for instance to the shallow-water equations with bathymetry. Besides, this relative entropy can be used to study finite volume schemes which are entropy-stable and well-balanced, and due to the numerical dissipation inherent to these methods, asymptotic stability of discrete stationary solutions is obtained. This analysis does not make us of any specific definition of the non-conservative products, applies to non-strictly hyperbolic systems, and is fully multidimensional with unstructured meshes for the numerical methods.

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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