Semi-hyperbolic patches of solutions to the two-dimensional nonlinear wave system for Chaplygin gases

Semi-hyperbolic patches of solutions to the two-dimensional nonlinear wave system for Chaplygin gases
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Chaplygin 气体二维非线性波系统解的半双曲补丁

DOI:
10.1016/j.jde.2014.05.020
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发表时间:
2014-09
影响因子:
2.4
通讯作者:
Guodong Wang
Guodong Wang
中科院分区:
数学2区
文献类型:
--
作者:
Yanbo Hu;Guodong Wang

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半双曲曲面片是指两个非线性特征族中的一族以音速曲线开始,以跨音速冲击波结束的区域。这类区域经常出现在欧拉方程及其简化模型的二维黎曼问题和其他几种情况中。将二维非线性波动系统的Chaplygin气体状态方程归结为一个以音速曲线为退化边界的Goursat边值问题,构造了该问题解的半双曲块。
Semi-hyperbolic patches are the regions in which one family out of two nonlinear families of characteristics starts on sonic curves and ends on transonic shock waves. This type of region appears frequently in the two-dimensional Riemann problem for the Euler equations and its simplified models and a few other situations. We construct a semi-hyperbolic patch of solution to the two-dimensional nonlinear wave system with Chaplygin gas equation of state by approaching the problem as a Goursat-type boundary value problem which has a sonic curve as the degenerate boundary.
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