钝体停滞点附近的扰动放大

IF 2.2 3区 工程技术 Q2 MECHANICS
Eduardo Martini, Clement Caillaud, Guillaume Lehnasch, Peter Jordan, Oliver Schmidt
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引用次数: 0

摘要

钝体周围的流体可能有不同的湍流过渡路径。最近有人探讨了通过抬升效应对扰动进行非模式放大,以解释轴对称体停滞点附近的过渡。然而,只有已经存在于边界层中的扰动才能被放大,而自由流扰动进入边界层的机制尚未得到充分探索。在本研究中,我们对扰动如何通过停滞点进入边界层进行了研究。在低湍流强度水平下边界层扰动的形成过程中,这种线性机制预计会比之前确定的非线性机制占主导地位。本文介绍了一项参数研究,揭示了雷诺数和马赫数的变化趋势。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Perturbation amplification near the stagnation point of blunt bodies

Perturbation amplification near the stagnation point of blunt bodies

Perturbation amplification near the stagnation point of blunt bodies

Different transition to turbulence routes for the flow around blunt bodies are possible. Non-modal amplification of perturbations via the lift-up effect has recently been explored to explain transition near the stagnation point in axisymmetric bodies. However, only perturbations already present in the boundary layer can be amplified, and the mechanisms by which free-stream perturbations enter the boundary layer have not yet been fully explored. In this study, we present an investigation of how disturbances enter the boundary layer via the stagnation point. This linear mechanism is expected to dominate over non-linear mechanisms previously identified on the formation of boundary layer perturbations at low turbulence intensity levels. A parametric investigation is presented, revealing trends with Reynolds and Mach numbers.

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来源期刊
CiteScore
5.80
自引率
2.90%
发文量
38
审稿时长
>12 weeks
期刊介绍: Theoretical and Computational Fluid Dynamics provides a forum for the cross fertilization of ideas, tools and techniques across all disciplines in which fluid flow plays a role. The focus is on aspects of fluid dynamics where theory and computation are used to provide insights and data upon which solid physical understanding is revealed. We seek research papers, invited review articles, brief communications, letters and comments addressing flow phenomena of relevance to aeronautical, geophysical, environmental, material, mechanical and life sciences. Papers of a purely algorithmic, experimental or engineering application nature, and papers without significant new physical insights, are outside the scope of this journal. For computational work, authors are responsible for ensuring that any artifacts of discretization and/or implementation are sufficiently controlled such that the numerical results unambiguously support the conclusions drawn. Where appropriate, and to the extent possible, such papers should either include or reference supporting documentation in the form of verification and validation studies.
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