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Grant support

A.L.-D. and H.J.B. acknowledge the support of NASA Transformative Aeronautics Concepts Program (grant no. NNX15AU93A) and the Office of Naval Research (grant no. N00014-16-S-BA10). This work was also supported by the Coturb project of the European Research Council (ERC-2014.AdG-669505) during the 2017 Coturb Turbulence Summer Workshop at the UPM. We thank Dr N. C. Constantinou, Dr J. I. Cardesa, Dr G. Tissot and Professor J. Jimenez, Professor P. J. Ioannou and Professor X. S. Liang for their helpful comments on earlier versions of the work.

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Perez Encinar, MiguelAuthor

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Causality of energy-containing eddies in wall turbulence

Publicated to:Journal Of Fluid Mechanics. 882 (A2): - 2020-01-01 882(A2), DOI: 10.1017/jfm.2019.801

Authors: Lozano-Duran, Adrian; Bae, H. Jane; Encinar, Miguel P.;

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Abstract

Turbulent flows in the presence of walls may be apprehended as a collection of momentum- and energy-containing eddies (energy-eddies), whose sizes differ by many orders of magnitude. These eddies follow a self-sustaining cycle, i.e. existing eddies are seeds for the inception of new ones, and so forth. Understanding this process is critical for the modelling and control of geophysical and industrial flows, in which a non-negligible fraction of the energy is dissipated by turbulence in the immediate vicinity of walls. In this study, we examine the causal interactions of energy-eddies in wall-bounded turbulence by quantifying how the knowledge of the past states of eddies reduces the uncertainty of their future states. The analysis is performed via direct numerical simulation of turbulent channel flows in which time-resolved energy-eddies are isolated at a prescribed scale. Our approach unveils, in a simple manner, that causality of energy-eddies in the buffer and logarithmic layers is similar and independent of the eddy size. We further show an example of how novel flow control and modelling strategies can take advantage of such self-similar causality.

Keywords

BreakdownFlowInformationInstabilityLarge-scale motionsMechanismModelPipeStructural similarityTurbulence simulationTurbulence theoryTurbulent boundary layersVelocity fluctuations

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Journal Of Fluid Mechanics due to its progression and the good impact it has achieved in recent years, according to the agency WoS (JCR), it has become a reference in its field. In the year of publication of the work, 2020, it was in position 4/34, thus managing to position itself as a Q1 (Primer Cuartil), in the category Physics, Fluids & Plasmas. Notably, the journal is positioned above the 90th percentile.

From a relative perspective, and based on the normalized impact indicator calculated from the Field Citation Ratio (FCR) of the Dimensions source, it yields a value of: 10.55, which indicates that, compared to works in the same discipline and in the same year of publication, it ranks as a work cited above average. (source consulted: Dimensions May 2025)

Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-05-30, the following number of citations:

  • WoS: 10
  • OpenCitations: 42

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 2025-05-30:

  • The use, from an academic perspective evidenced by the Altmetric agency indicator referring to aggregations made by the personal bibliographic manager Mendeley, gives us a total of: 80.
  • 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: 79 (PlumX).

With a more dissemination-oriented intent and targeting more general audiences, we can observe other more global scores such as:

  • The Total Score from Altmetric: 1.25.
  • The number of mentions on the social network X (formerly Twitter): 3 (Altmetric).

Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: United States of America.