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arXiv 2103.16459math.AP
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带势流方程的非对称凸楔激波反射问题解的正则性损失

Loss of Regularity of Solutions to Shock Reflection Problems by a Non-symmetric Convex Wedge with Potential Flow Equations

Jingchen Hu

摘要:

本文从位流方程出发,研究了激波在楔形体上的反射问题,位流方程是欧拉方程的简化。在M. Feldman和G. Chen的方法,建立了势流方程的激波反射问题的存在性理论。上游流动的方向。作为一个自然扩张,我们研究非对称的情况下,即当上游流的方向形成一个非零的角度与对称轴的楔形。研究非对称问题解的存在性的主要思想是研究解的对称性。这样就产生了诸如自由边界和椭圆度退化等困难,特别是当椭圆度在自由边界上退化时。我们开发了一种积分方法来克服这些困难。作为G.Lieberman工作的推广,本文还建立了楔角附近的一些估计.证明了在非对称情形下,势流方程的理想Lipschitz解(我们称之为正则解)不存在。这表明非对称激波反射问题的势流解应该具有一些在对称情况下不会遇到的奇异性。

英文摘要:

In this paper, we study the problem of shock reflection by a wedge, with the potential flow equation, which is a simplification of the Euler System. In the work of M. Feldman and G. Chen, the existence theory of shock reflection problems with the potential flow equation was established, when the wedge is symmetric w.r.t. the direction of the upstream flow. As a natural extension, we study non-symmetric cases, i.e. when the direction of the upstream flow forms a nonzero angle with the symmetry axis of the wedge. The main idea of investigating the existence of solutions to non-symmetric problems is to study the symmetry of the solution. Then difficulties arise such as free boundaries and degenerate ellipticity, especially when ellipticity degenerates on the free boundary. We developed an integral method to overcome these difficulties. Some estimates near the corner of wedge is also established, as an extension of G.Lieberman's work. We proved that in non-symmetric cases, the ideal Lipschitz solution to the potential flow equation, which we call regular solution, does not exist. This suggests that the potential flow solutions to the non-symmetric shock reflection problem, should have some singularity which is not encountered in symmetric case.

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