Repositori institucional URV
| URV's Author/s: | Giralt Prat, Francesc d'Assís / Herrero Sabartés, Juan |
| Author, as appears in the article.: | Mandava, V S R; Herrero, Joan; Kopp, Gregory A; Giralt, Francesc |
| Author's mail: | fgiralt@urv.cat joan.herrero@urv.cat |
| Author identifier: | 0000-0001-8501-1187 |
| Journal publication year: | 2022 |
| Publication Type: | Journal Publications |
| APA: | Mandava, V S R; Herrero, Joan; Kopp, Gregory A; Giralt, Francesc (2022). Wake behind a discontinuous cylinder: unveiling the role of the large scales in wake growth and entrainment. Journal Of Fluid Mechanics, 936(), A4-. DOI: 10.1017/jfm.2022.32 |
| Paper original source: | Journal Of Fluid Mechanics. 936 A4- |
| Abstract: | The turbulent flow in the wake of a discontinuous cylinder (DC) was investigated. The DC geometry consisted of cylinder segments 5D long (with D being the diameter of the cylinder) separated by gaps of width 2.5D. Particle image velocimetry and hot-wire anemometry were used to analyse the flow at two Reynolds numbers, Re = 4000 and 10000, for x/D <= 180. Large eddy simulations for both the DC and the infinite continuous cylinder (CC) wakes were also carried out at Re = 10000. The DC configuration was devised to trigger the shedding of horseshoe vortices (HSV) in the very-near-wake region with the intent of illustrating the role that these three-dimensional HSVs, previously identified in the far-wake region of CC, play in the entrainment process in turbulent wakes. The DC geometry produced HSVs by the interaction between the high momentum flow through the gaps and the main spanwise vortex shed behind each cylinder segment, while in the CC wake they evolve from near-wake instabilities straddled with hairpin vortices that detach spanwise vorticity from the shed Karman vortices. The DC wake was found to grow and spread in the transverse direction with a much faster rate than for the CC wake, up until approximately x/D approximate to 50. Prior to this location, the enhanced growth rate caused by the shear-aligned HSV led to a wake width of approximately 3 times that of the CC wake, with a maximum mean velocity deficit that was approximately half. |
| Article's DOI: | 10.1017/jfm.2022.32 |
| Link to the original source: | https://www.cambridge.org/core/journals/journal-of-fluid-mechanics/article/abs/wake-behind-a-discontinuous-cylinder-unveiling-the-role-of-the-large-scales-in-wake-growth-and-entrainment/A0FBA63E79B8CF37FE401F03049785CA# |
| Paper version: | info:eu-repo/semantics/acceptedVersion |
| licence for use: | https://creativecommons.org/licenses/by/3.0/es/ |
| Department: | Enginyeria Química |
| Licence document URL: | https://repositori.urv.cat/ca/proteccio-de-dades/ |
| Thematic Areas: | Physics, fluids & plasmas Mechanics of materials Mechanics Mechanical engineering Matemática / probabilidade e estatística Interdisciplinar Geociências Engenharias iv Engenharias iii Engenharias ii Engenharias i Condensed matter physics Astronomia / física Applied mathematics |
| Keywords: | Wall proximity Wakes Vortex shedding Velocity-field Turbulent/non-turbulent interface Turbulent convection Transport Transition Temperature Simulation Large eddies Flow Circular-cylinder |
| Entity: | Universitat Rovira i Virgili |
| Record's date: | 2025-01-28 |
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