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arXiv 1807.06646math.APmath-phmath.MP
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可压缩流体全Euler方程定常多波解的稳定性

Stability of Steady Multi-Wave Configurations for the Full Euler Equations of Compressible Fluid Flow

Gui-Qiang G. Chen, Matthew Rigby

摘要:

本文研究可压缩流体流动的全欧拉方程定常多波位形的稳定性。在本文中,我们专注于稳定的四波配置,即在流动方向上的黎曼问题的解决方案,由两个冲击,一个涡面,和一个熵波,这是一个核心的多波配置的二维欧拉方程的稳定性。证明了这种定常四波位形即使在来流沿流向的BV扰动下,也是全局稳定的。为了实现这一点,我们首先制定的柯西问题(初值问题)的流动方向,然后开发一个修改的Glimm差分格式,并确定一个Glimm型功能,以获得所需的BV估计不仅跟踪之间的相互作用,强激波和弱波,但也强涡面/熵波和弱波。欧拉方程的一个重要特征是,当不同族的弱波与强涡面/熵波或激波相互作用时,反射系数总是小于1,这是保证Glimm泛函减小的关键。然后,这些估计建立的近似解收敛到一个整体熵的解决方案,接近的背景解决方案的稳定四波位形。

英文摘要:

We are concerned with the stability of steady multi-wave configurations for the full Euler equations of compressible fluid flow. In this paper, we focus on the stability of steady four-wave configurations that are the solutions of the Riemann problem in the flow direction, consisting of two shocks, one vortex sheet, and one entropy wave, which is one of the core multi-wave configurations for the two-dimensional Euler equations. It is proved that such steady four-wave configurations in supersonic flow are stable in structure globally, even under the BV perturbation of the incoming flow in the flow direction. In order to achieve this, we first formulate the problem as the Cauchy problem (initial value problem) in the flow direction, and then develop a modified Glimm difference scheme and identify a Glimm-type functional to obtain the required BV estimates by tracing the interactions not only between the strong shocks and weak waves, but also between the strong vortex sheet/entropy wave and weak waves. The key feature of the Euler equations is that the reflection coefficient is always less than 1, when a weak wave of different family interacts with the strong vortex sheet/entropy wave or the shock wave, which is crucial to guarantee that the Glimm functional is decreasing. Then these estimates are employed to establish the convergence of the approximate solutions to a global entropy solution, close to the background solution of steady four-wave configuration.

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