Subsonic flows with a contact discontinuity in a finitely long axisymmetric cylinder

IF 16.4 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Shangkun Weng, Zihao Zhang
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Abstract

This paper concerns the structural stability of subsonic flows with a contact discontinuity in a finitely long axisymmetric cylinder. We establish the existence and uniqueness of axisymmetric subsonic flows with a contact discontinuity by prescribing the horizontal mass flux distribution, the swirl velocity, the entropy and the Bernoulli’s quantity at the entrance and the radial velocity at the exit. It can be formulated as a free boundary problem with the contact discontinuity to be determined simultaneously with the flows. Compared with the two-dimensional case, a new difficulty arises due to the singularity near the axis. An invertible modified Lagrangian transformation is introduced to overcome this difficulty and straighten the contact discontinuity. The key elements in our analysis are to utilize the deformation-curl decomposition introduced in [S. Weng and Z. Xin, A deformation-curl decomposition for three dimensional steady Euler equations, Sci. Sin. Math.49 (2019) 307–320 (in Chinese): doi:10.1360/N012018-00125] to effectively decouple the hyperbolic and elliptic modes in the steady axisymmetric Euler system and to use the implicit function theorem to locate the contact discontinuity.

有限长轴对称圆柱体中带有接触不连续性的亚声速流动
本文涉及有限长轴对称圆柱体中带有接触不连续面的亚音速流动的结构稳定性。我们通过预设水平质量通量分布、漩涡速度、熵以及入口处的伯努利量和出口处的径向速度,建立了带有接触不连续面的轴对称亚音速流动的存在性和唯一性。它可以表述为一个自由边界问题,接触不连续面与流动同时确定。与二维情况相比,由于轴线附近的奇异性,出现了一个新的难题。我们引入了一种可逆的修正拉格朗日变换来克服这一困难,并使接触非连续性变直。我们分析的关键要素是利用 [S. Weng and Z. Xin, A. Lagrangian transforms, A. Lagrangian transforms, A. Lagrangian transforms, A. Lagrangian transforms, A.Weng and Z. Xin, A deformation-curl decomposition for three dimensional steady Euler equations, Sci.Math.49 (2019) 307-320 (in Chinese): doi:10.1360/N012018-00125] 中介绍的变形-卷线分解来有效地解耦稳定轴对称欧拉系统中的双曲模和椭圆模,并利用隐函数定理来定位接触间断点。
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来源期刊
Accounts of Chemical Research
Accounts of Chemical Research 化学-化学综合
CiteScore
31.40
自引率
1.10%
发文量
312
审稿时长
2 months
期刊介绍: Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.
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