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arXiv 0906.1277math.APmath-phmath.MP
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激波反射-衍射现象与多维守恒律

Shock Reflection-Diffraction Phenomena and Multidimensional Conservation Laws

Gui-Qiang Chen, Mikhail Feldman

摘要:

当一个平面激波迎面撞击一个楔形体时,它经历一个反射-绕射过程,然后随着原激波在时间上向前移动,一个自相似的反射激波向外移动。马赫在1878年首次报道了反射-衍射构型的复杂性,实验、计算和渐近分析表明,可能出现各种激波反射-衍射构型,包括规则反射和马赫反射。在本文中,我们开始与各种冲击反射衍射现象,他们的基本科学问题,和他们的理论作用作为积木和渐近吸引子的一般解决方案的数学理论中的多维双曲守恒律系统。然后,我们描述了如何整体问题的冲击波反射-衍射的楔形可以制定为一个自由边界问题的混合复合双曲-椭圆型的非线性守恒律。最后,我们讨论了冲击波反射-衍射问题的一些最新进展,包括整体正则反射-衍射解的存在性、稳定性和正则性。该方法包括技术来处理自由边界问题,退化椭圆型方程,角奇异,这是高度激励实验,计算和渐近结果。进一步的趋势和开放的问题,在这个方向也得到解决。

英文摘要:

When a plane shock hits a wedge head on, it experiences a reflection-diffraction process, and then a self-similar reflected shock moves outward as the original shock moves forward in time. The complexity of reflection-diffraction configurations was first reported by Ernst Mach in 1878, and experimental, computational, and asymptotic analysis has shown that various patterns of shock reflection-diffraction configurations may occur, including regular reflection and Mach reflection. In this paper we start with various shock reflection-diffraction phenomena, their fundamental scientific issues, and their theoretical roles as building blocks and asymptotic attractors of general solutions in the mathematical theory of multidimensional hyperbolic systems of conservation laws. Then we describe how the global problem of shock reflection-diffraction by a wedge can be formulated as a free boundary problem for nonlinear conservation laws of mixed-composite hyperbolic-elliptic type. Finally we discuss some recent developments in attacking the shock reflection-diffraction problem, including the existence, stability, and regularity of global regular reflection-diffraction solutions. The approach includes techniques to handle free boundary problems, degenerate elliptic equations, and corner singularities, which is highly motivated by experimental, computational, and asymptotic results. Further trends and open problems in this direction are also addressed.

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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