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arXiv 1804.04769math.AP
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有限喷管中二维定常可压缩欧拉流超音速接触间断的稳定性

Stability of supersonic contact discontinuity for two-dimensional steady compressible Euler flows in a finite nozzle

Feimin Huang, Jie Kuang, Dehua Wang, Wei Xiang

摘要:

本文研究了变截面长喷管中二维定常可压缩欧拉流的超音速接触间断的稳定性。我们将问题表述为一个初边值问题,接触不连续作为一个自由边界。对于自由边界值问题,我们利用拉格朗日变换将接触间断拉直,从而使自由边界值问题变为固定边值问题。我们发展了一个迭代格式,并建立了角区域上一阶双曲型方程解的一些新的估计。最后,利用逆拉格朗日变换,在来流和喷管壁面为背景状态的光滑扰动的假设下,证明了原自由边界问题存在唯一的弱解,它是背景状态的一个小扰动,且解由两个光滑的超声速流和一个光滑的接触间断组成。

英文摘要:

In this paper, we study the stability of supersonic contact discontinuity for the two-dimensional steady compressible Euler flows in a finitely long nozzle of varying cross-sections. We formulate the problem as an initial-boundary value problem with the contact discontinuity as a free boundary. To deal with the free boundary value problem, we employ the Lagrangian transformation to straighten the contact discontinuity and then the free boundary value problem becomes a fixed boundary value problem. We develop an iteration scheme and establish some novel estimates of solutions for the first order of hyperbolic equations on a cornered domain. Finally, by using the inverse Lagrangian transformation and under the assumption that the incoming flows and the nozzle walls are smooth perturbations of the background state, we prove that the original free boundary problem admits a unique weak solution which is a small perturbation of the background state and the solution consists of two smooth supersonic flows separated by a smooth contact discontinuity.

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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