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arXiv 1202.5853math.AP
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重新讨论间断通量下标量守恒律的熵条件

Entropy conditions for scalar conservation laws with discontinuous flux revisited

Boris Andreianov, Darko Mitrovic

摘要:

推广了一维Karlsen-Risebro-Towers熵条件,提出了具有间断通量的多维双曲型标量守恒律的新的熵容许条件.这些新的条件的设计,特别是为了表征消失粘度近似的限制。一方面,它们很自然地符合某一类物理和数值模拟假设;另一方面,它们的数学评估结果是复杂的。\smallskip我们提出的推广不仅是关于空间维的,而且主要是在[K. H.新罕布什尔州卡尔森Risebro,J. Towers,Skr.\,K.\,也不是。\,Vid.\,塞尔斯克(2003)]并不是强制性的证明唯一性的新定义。我们证明了解决方案的唯一性,并给出工具,证明其存在性通过消失粘性方法,为多维空间非齐次的情况下,有限数量的Lipschitz正则超曲面的通量函数的不连续性。

英文摘要:

We propose new entropy admissibility conditions for multidimensional hyperbolic scalar conservation laws with discontinuous flux which generalize one-dimensional Karlsen-Risebro-Towers entropy conditions. These new conditions are designed, in particular, in order to characterize the limit of vanishing viscosity approximations. On the one hand, they comply quite naturally with a certain class of physical and numerical modeling assumptions; on the other hand, their mathematical assessment turns out to be intricate. \smallskip The generalization we propose is not only with respect to the space dimension, but mainly in the sense that the "crossing condition" of [K.H. Karlsen, N.H. Risebro, J. Towers, Skr.\,K.\,Nor.\,Vid.\,Selsk. (2003)] is not mandatory for proving uniqueness with the new definition. We prove uniqueness of solutions and give tools to justify their existence via the vanishing viscosity method, for the multi-dimensional spatially inhomogeneous case with a finite number of Lipschitz regular hypersurfaces of discontinuity for the flux function.

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