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arXiv 2102.08916math.APmath-phmath.MP
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二维可压缩弹性动力学中激波的弱稳定性

On weak stability of shock waves in 2D compressible elastodynamics

Yuri Trakhinin

摘要:

利用1-激波的一致Lopatinski条件的一个等价形式,证明了[A. Morando,Y. Trakhinin,P. Trebeschi,2D可压缩弹性动力学中冲击波的结构稳定性,Math.Ann.378(2020)1471-1504]对于可压缩等熵无粘弹性材料的二维流中的直线冲击波,对于一致稳定性(意味着相应弯曲冲击波的结构非线性稳定性)而言,不仅是充分的,而且是必要的。我们谱分析的关键点是对均匀稳定性和弱稳定性之间的过渡进行细致的研究。此外,我们证明了直线冲击波从来没有激烈的不稳定,即,它们总是一致稳定或弱稳定的。

英文摘要:

By using an equivalent form of the uniform Lopatinski condition for 1-shocks, we prove that the stability condition found by the energy method in [A. Morando, Y. Trakhinin, P. Trebeschi, Structural stability of shock waves in 2D compressible elastodynamics, Math. Ann. 378 (2020) 1471-1504] for the rectilinear shock waves in two-dimensional flows of compressible isentropic inviscid elastic materials is not only sufficient but also necessary for uniform stability (implying structural nonlinear stability of corresponding curved shock waves). The key point of our spectral analysis is a delicate study of the transition between uniform and weak stability. Moreover, we prove that the rectilinear shock waves are never violently unstable, i.e., they are always either uniformly or weakly stable.

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