Subsonic solutions to a shock diffraction problem by a convex cornered wedge for the pressure gradient system

Subsonic solutions to a shock diffraction problem by a convex cornered wedge for the pressure gradient system
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压力梯度系统中凸角楔块对冲击衍射问题的亚音速解决方案

DOI:
10.3934/cpaa.2020217
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发表时间:
2020
期刊:
Commun. Pure Appl. Anal
影响因子:
--
通讯作者:
Kyungwoo Song
Kyungwoo Song
中科院分区:
其他
文献类型:
--
作者:
Yinzheng Sun;Qin Wang;Kyungwoo Song

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本文建立了一个由自相似压力梯度系统控制的二维Riemann问题的整体亚音速解的存在性。由于亚音速区的边界由跨音速激波和部分音速圆组成,因此控制方程成为具有退化斜导数边界条件的二阶非线性退化椭圆型方程的自由边界问题。我们还得到了最佳的\开始{document}$ C^{0,1} $\end{document} -正则性的解决方案,通过退化的声波边界。
We establish the global existence of subsonic solutions to a two dimensional Riemann problem governed by a self-similar pressure gradient system for shock diffraction by a convex cornered wedge. Since the boundary of the subsonic region consists of a transonic shock and a part of a sonic circle, the governing equation becomes a free boundary problem for nonlinear degenerate elliptic equation of second order with a degenerate oblique derivative boundary condition. We also obtain the optimal \begin{document}$ C^{0,1} $\end{document} -regularity of the solutions across the degenerate sonic boundary.
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