New Insights into Turbulent Spots

IF 25.4 1区工程技术 Q1 MECHANICS

Annual Review of Fluid Mechanics Pub Date : 2022-09-21 DOI:10.1146/annurev-fluid-120720-021813

Xiaohua Wu

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引用次数: 4

Abstract

Transitional–turbulent spots bridge the deterministic laminar state with the stochastic turbulent state and affect the transition zone length in engineering flows. Turbulent spot research over the past four decades has expanded from incompressible flat-plate boundary layer and pipe flow to hypersonic boundary layer flow, turbomachinery flow, channel flow, plane Couette flow, and a range of more complex flows. Progress has been made on the origination, composition, demarcation, growth, mutual interaction, reproduction, sustainability, and self-organization of turbulent spots. The hypothesis that transitional–turbulent spots are a basic module of the fully turbulent boundary layer has been proven through the discovery of locally generated turbulent–turbulent spots dominating the wall layer. Splitting of transitional–turbulent spots in pipe flow has been linked to a life cycle localized in the spot frontal section. This review discusses these advances and outlines future research directions. Expected final online publication date for the Annual Review of Fluid Mechanics, Volume 55 is January 2023. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.

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对湍流点的新见解

在工程流动中，过渡湍流点架起了确定性层流状态与随机湍流状态的桥梁，影响着过渡区长度。在过去的四十年中，湍流斑的研究已经从不可压缩的平板边界层和管道流动扩展到高超声速边界层流动、涡轮机械流动、通道流动、平面Couette流动以及一系列更复杂的流动。湍流斑的产生、组成、划分、生长、相互作用、繁殖、可持续性和自组织等方面取得进展。过渡湍流斑是完全湍流边界层的基本模块的假设已经通过局部生成的湍流斑的发现得到了证明。管道流动中过渡湍流斑的分裂与斑前缘局部化的生命周期有关。本文对这些进展进行了讨论，并展望了未来的研究方向。预计流体力学年度评论第55卷的最终在线出版日期为2023年1月。修订后的估计数请参阅http://www.annualreviews.org/page/journal/pubdates。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Annual Review of Fluid Mechanics 物理-力学

CiteScore

54.00

自引率

0.40%

发文量

期刊介绍： The Annual Review of Fluid Mechanics is a longstanding publication dating back to 1969 that explores noteworthy advancements in the field of fluid mechanics. Its comprehensive coverage includes various topics such as the historical and foundational aspects of fluid mechanics, non-newtonian fluids and rheology, both incompressible and compressible fluids, plasma flow, flow stability, multi-phase flows, heat and species transport, fluid flow control, combustion, turbulence, shock waves, and explosions. Recently, an important development has occurred for this journal. It has transitioned from a gated access model to an open access platform through Annual Reviews' innovative Subscribe to Open program. Consequently, all articles published in the current volume are now freely accessible to the public under a Creative Commons Attribution (CC BY) license. This new approach not only ensures broader dissemination of research in fluid mechanics but also fosters a more inclusive and collaborative scientific community.