Square cylinder downstream of two different-velocity streams
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/370925
Tipus de documentComunicació de congrés
Data publicació2022
Condicions d'accésAccés obert
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Reconeixement-NoComercial-SenseObraDerivada 4.0 Internacional
Abstract
We study the flow past a square cylinder immersed in the wake of an upstream splitter plate separating two different-velocity streams. The bottom stream Reynolds number, ReB = 56 is kept constant for all cases, while the top-to-bottom Reynolds numbers ratio R = ReT/ReB is in the range R ¿ [1,6.5], corresponding to a variation of the bulk Reynolds number Re = (ReT +ReB)/2 ¿ [56, 210]. The onset of vortex-shedding, at R = 2.1 ± 0.1 (corresponding to Re = 86.8 ± 2.8), is pushed to higher Re as compared to the square cylinder in the classic configuration. The threedimensionality is triggered by a mode-C-type instability at R ¿ 3.1 (Re ¿ 115) with wavelength ¿z ¿2.5±0.1, similar to the mode reported for square cylinders placed at an incidence. For a velocity ratio R = 3.4 the flow is period-doubled and exhibits three spanwise symmetries: a mirror reflection and two spatiotemporal symmetries. The road to spatio-temporal chaos is initiated thereafter with a modulational period-doubling tertiary bifurcation at R ¿ (3.4,3.8) that also doubles the spanwise periodicity. The resulting nonlinear solution repeats after four vortex shedding cycles and retains only a spatiotemporal invariance consisting in the evolution by half a period followed by mirror reflection about a streamwise-cross-stream plane. At slighlty higher values R = 4, the flow becomes spatio-temporally chaotic, but the main features of mode C are still observable
CitacióEl Mansy, R. [et al.]. Square cylinder downstream of two different-velocity streams. A: Spanish Fluid Mechanics Conference. "1st Spanish Fluid Mechanics Conference: Cádiz, Spain: June 19-22, 2022: book of abstracts". 2022,
Versió de l'editorhttps://sfmc22.uca.es/program/
Col·leccions
- Departament de Mecànica de Fluids - Ponències/Comunicacions de congressos [195]
- Departament de Física - Ponències/Comunicacions de congressos [673]
- MICROTECH LAB - Microtechnology for the Industry - Ponències/Comunicacions de congressos [8]
- Doctorat en Enginyeria Mecànica, Fluids i Aeronàutica - Ponències/Comunicacions de congressos [54]
Fitxers | Descripció | Mida | Format | Visualitza |
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Spanish_Fluid_Mechanics_Conference_Reda.pdf | Abstract conference | 13,77Mb | Visualitza/Obre |