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Numerical Study of the Transition Regime between the Skimming and Wake Interference Flows in a Water Flume by Using the Lattice-Model Approach |
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| Authors: | F. J. Jimenez-Hornero X. X. Zhang J. V. Giraldez A. M. Laguna |
| Affiliation: | 1Research Associate, Dept. of Agronomy, Section of Hydraulic Engineering, Univ. of Cordoba, Albert Einstein (C2) Bldg., Campus Rabanales, 14071 Cordoba, Spain. E-mail: ir2jihof@uco.es 2Lecturer, Dept. of Engineering, Univ. of Liverpool, Brodie Tower, Brownlow St., Liverpool L69 3GQ, U.K. E-mail: Xiaoxian.Zhang@liverpool.ac.uk 3Professor, Dept. of Agronomy, Section of Hydraulic Engineering, Univ. of Cordoba, P.O. Box 3048, 14080 Cordoba, Spain. E-mail: ag1gicej@uco.es 4Associate Professor, Dept. of Applied Physics, Univ. of Cordoba, Albert Einstein (C2) Bldg., Campus Rabanales, 14071 Cordoba, Spain. E-mail: fa1lalua@uco.es |
| Abstract: | A numerical study to describe the transition regime between the skimming and wake interference flows due to the influence of an idealized bed roughness in a water flume was carried out here using the lattice model approach. The model reproduced the skimming, transition, and wake interference regimes for different aspect ratios that determine the bed roughness geometry. The simulated turbulent structures were visualized by drawing the trajectories of a large number of passive tracer particles released in the computational domain, and the results agreed with those reported by the research works. The dimensionless streamwise and vertical turbulent intensities were calculated at five test sections. The results obtained supported the visualized flow patterns permitting us to detect the presence of a shear layer developed at the top of the roughness element, whose strength varied according to the flow regime simulated. |
| Keywords: | Bed roughness Turbulent flow Numerical models Flow visualization Flumes |