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Journal of Flow Visualization and Image Processing

Publicado 4 números por año

ISSN Imprimir: 1065-3090

ISSN En Línea: 1940-4336

The Impact Factor measures the average number of citations received in a particular year by papers published in the journal during the two preceding years. 2017 Journal Citation Reports (Clarivate Analytics, 2018) IF: 0.6 The Immediacy Index is the average number of times an article is cited in the year it is published. The journal Immediacy Index indicates how quickly articles in a journal are cited. Immediacy Index: 0.6 The Eigenfactor score, developed by Jevin West and Carl Bergstrom at the University of Washington, is a rating of the total importance of a scientific journal. Journals are rated according to the number of incoming citations, with citations from highly ranked journals weighted to make a larger contribution to the eigenfactor than those from poorly ranked journals. Eigenfactor: 0.00013 The Journal Citation Indicator (JCI) is a single measurement of the field-normalized citation impact of journals in the Web of Science Core Collection across disciplines. The key words here are that the metric is normalized and cross-disciplinary. JCI: 0.14 SJR: 0.201 SNIP: 0.313 CiteScore™:: 1.2 H-Index: 13

Indexed in

INSIGHT INTO COHERENCE STRUCTURE IN LOGARITHMIC REGION OF WALL TURBULENCE WITH DETACHED EDDY BY USING CONDITIONALLY AVERAGED TWO-CAMERA PIV MEASUREMENTS

Volumen 25, Edición 1, 2018, pp. 1-13
DOI: 10.1615/JFlowVisImageProc.2018026747
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SINOPSIS

Two-camera particle image velocimetry (PIV) was used to investigate the structural characteristics of organized motions in a logarithmic layer under influences of overlying detached eddies, which mimics very-large-scale motions in the near-neutral atmospheric surface layer. We used the same experimental technique of our previous studies, except for velocity measurements: in the present study, the velocity vectors were measured with a two-camera PIV technique to ensure spatial fine resolutions for capturing turbulence vortices and also a large visualized area for observing organized motions. Two-dimensional velocity fields in a streamwise-spanwise plane of the logarithmic layer were visualized by light sheets discharged from yttrium aluminum garnet (YAG) laser systems. Visualized images were captured by CCD cameras, and then velocity vectors were calculated with a cross-correlation method. After confirming the existence of large-scale structures with the spatial distributions of two-point correlations of streamwise-velocity fluctuations, which showed long tails of high-correlation regions in the streamwise direction, we detected the snapshots including the organized motions by using time-series data of higher-order moments obtained by a spatial averaging procedure for velocity vectors in each snapshot. The organized motions accompanied by streaky structures of low-momentum motions, the characteristic length of which fully exceeded the logarithmic layer height in the streamwise direction, meandered in the spanwise direction, and such motions generated large streamwise-velocity fluctuations in low-frequency regions through velocity gradient in the spanwise direction.

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