Autor según el artículo: Mandava, V. S. R.; Herrero, Joan; Kopp, Gregory A.; Giralt, Francesc;
Departamento: Enginyeria Química
Autor/es de la URV: Giralt Prat, Francesc d'Assís / Herrero Sabartés, Juan
Palabras clave: Wall proximity Wakes Vortex shedding Velocity-field Turbulent/non-turbulent interface Turbulent convection Transport Transition Temperature Simulation Large eddies Flow Circular-cylinder
Resumen: 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.
Áreas temáticas: 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
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
Direcció de correo del autor: fgiralt@urv.cat joan.herrero@urv.cat
Identificador del autor: 0000-0001-8501-1187
Fecha de alta del registro: 2024-07-20
Versión del articulo depositado: info:eu-repo/semantics/acceptedVersion
Enlace a la fuente original: 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#
URL Documento de licencia: http://repositori.urv.cat/ca/proteccio-de-dades/
Referencia al articulo segun fuente origial: Journal Of Fluid Mechanics. 936
Referencia de l'ítem segons les normes 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(), -. DOI: 10.1017/jfm.2022.32
DOI del artículo: 10.1017/jfm.2022.32
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2022
Tipo de publicación: Journal Publications
Repositori URV