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This work was supported by National Natural Science Foundation of China under Grant No. 91752205, and by the European Research Council under the Coturb and Caust grants ERC-2014.AdG-669505 and ERC-2020.AdG-101018287.
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Jimenez, JAuthorInteraction between near-wall streaks and large-scale motions in turbulent channel flows
Publicated to:Journal Of Fluid Mechanics. 940 - 2022-01-01 940(), DOI: 10.1017/jfm.2022.236
Authors: Zhou, Zisong; Xu, Chun-Xiao; Jimenez, Javier;
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Abstract
The interactions between the near-wall streaks and the large-scale motions (LSMs) of the outer region of wall-bounded turbulent flows are investigated. The co-supporting hypothesis of Toh & Itano (J. Fluid Mech., vol. 524, 2005, pp. 249-262) is checked in full-scale channels at low to moderate Reynolds numbers, from two points of view. To study the top-down influence of the outer structures on the spanwise motion of the near-wall streaks, a method inspired by particle-image velocimetry is used to track the spanwise position of the streaks. Their spanwise advection velocity is found to be affected by the hierarchy of large-scale circulations in the logarithmic layer, but their spanwise streak density is only weakly related to the LSMs. The evidence suggests that a top-down influence exists and drives the drift of the streaks in the spanwise direction, as suggested by Toh & Itano (J. Fluid Mech., vol. 524, 2005, pp. 249-262), but that the hypothesised streak accumulation rarely occurs. Numerical experiments at Re-tau approximate to 535 are then performed to clarify the role of the near-wall streaks in the generation and preservation of the outer LSMs. The results show that the merger of the near-wall streaks is only weakly correlated with the generation of the LSMs, and that removing the near-wall roots of the LSMs does not affect the evolution of their outer region. It is concluded that the bottom-up influence from the near-wall streaks is not essential for the LSM generation and preservation, also weakening the evidence for the co-supporting hypothesis.
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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, 2022, it was in position 6/34, thus managing to position itself as a Q1 (Primer Cuartil), in the category Physics, Fluids & Plasmas.
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: 3.66, 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 Jul 2025)
Specifically, and according to different indexing agencies, this work has accumulated citations as of 2025-07-09, the following number of citations:
- WoS: 4
- Scopus: 10
Impact and social visibility
Leadership analysis of institutional authors
This work has been carried out with international collaboration, specifically with researchers from: China.
There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: Last Author (JIMENEZ SENDIN, JAVIER).