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Jimenez JAuthor

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January 22, 2021
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The instability of streaks and the generation mechanism of streamwise vorticity in near-wall Turbulence

Publicated to: Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B. 66 (642): 383-391 - 2000-01-01 66(642), DOI: 10.1299/kikaib.66.383

Authors:

Kawahara G; Jimenez J; Uhlmann M; Pinelli A
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Affiliations

Ehime University - Author

Abstract

The linear stability analysis has been performed at Rer = 180 for a turbulent-channel-type base flow with a periodic undulation in the spanwise direction in order to elucidate the generation mechanism of streamwise vorticity through the instability of streaks in near-wall turbulence. It is found that there appear three different instability modes depending on the spanwise wavenumber of streaks. In the case of the streak with around 100 wall-unit spanwise wavelength its critical velocity amplitude lies at ΔŨ'İ, above which streaky flow is unstable to an infinitesimal sinuous disturbance, i. e. a bending mode along the streamwise direction. The instability is identified to originate from inflection points, i. e. wake-like instability, in the spanwise variation of the streaky flow. In this case, unstable eigenmodes take a form that is inclined towards the streamwise direction from the wall -normal direction, and they directly induce the streamwise vorticity on low- and high-speed streaks. In addition, the streamwise vorticity is secondarily produced pricipally through tilting of the wall-normal disturbance vorticity by the base flow shear across the wall-normal direction.
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Keywords

Flow instabilityLinear stability analysisNear-wall turbulenceShear flowStreaky structureStreamwise vorticityThree-dimensional flowTurbulenceTurbulent flow

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Nihon Kikai Gakkai Ronbunshu, B Hen/Transactions of the Japan Society of Mechanical Engineers, Part B, Q3 Agency Scopus (SJR), its regional focus and specialization in Mechanical Engineering, give it significant recognition in a specific niche of scientific knowledge at an international level.

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Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2026-04-27:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 3 (PlumX).

It is essential to present evidence supporting full alignment with institutional principles and guidelines on Open Science and the Conservation and Dissemination of Intellectual Heritage. A clear example of this is:

  • The work has been submitted to a journal whose editorial policy allows open Open Access publication.
  • Assignment of a Handle/URN as an identifier within the deposit in the Institutional Repository: https://oa.upm.es/88221/

As a result of the publication of the work in the institutional repository, statistical usage data has been obtained that reflects its impact. In terms of dissemination, we can state that, as of

  • Views: 113
  • Downloads: 15
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Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Japan.

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