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Meandering jets in shallow rectangular reservoirs: POD analysis and identification of coherent structures

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Abstract

The effect of the shallowness on meandering jets in a shallow rectangular reservoir is investigated. Four meandering flows were investigated in an experimental shallow rectangular reservoir. Their boundary conditions were chosen to cover a large range of friction numbers (defined with the sudden expansion width). Due to the unsteady characteristics of the flows, a proper orthogonal decomposition (POD) of the fluctuating part of the surface velocity fields measured using Large-Scale Particle Image Velocity was used for discriminating the flow structures responsible for the meandering of the jet. Less than 1 % of the calculated POD modes significantly contribute to the meandering of the jet, and two types of instability are in competition in such a flow configuration. The sinuous mode is the dominant mode in the flow, and it induces the meandering of the flow, while the varicose mode is a source of local mixing and weakly participates to the flow. The fluctuating velocity fields were then reconstructed using the POD modes corresponding to 80 % of the total mean fluctuating kinetic energy, and the coherent structures were identified using the residual vorticity, their centres being localised using a topology algorithm. The trajectories of the structures centres emphasise that at high friction number the coherent structures are small and laterally paired in the near, middle and far fields of the jet, while with decreasing friction number, the structures merge into large horizontal vortices in the far field of the jet, their trajectories showing more variability in space and time. The analysis of the stability regime finally reveals that the sinuous mode is convectively unstable and may become absolutely unstable at the end of the reservoir when the friction number is small.

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Acknowledgments

The research was funded by the University of Liège (Grant SFRD-12/27). The authors are grateful for the assistance provided by the research technicians during the experiments and the fruitful discussions about the POD analysis with Professor Vincent Denoël. The authors are thankful to the two anonymous reviewers, whose remarks allow a substantial improvement of the present work.

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  1. Research Group HECE, ArGEnCo Department, University of Liege (ULg), Chemin des Chevreuils 1, Bat B52/3 +1, 4000, Liège, Belgium

    Y. Peltier, S. Erpicum, P. Archambeau, M. Pirotton & B. Dewals

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  1. Y. Peltier
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Correspondence to Y. Peltier.

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Peltier, Y., Erpicum, S., Archambeau, P. et al. Meandering jets in shallow rectangular reservoirs: POD analysis and identification of coherent structures. Exp Fluids 55, 1740 (2014). https://doi.org/10.1007/s00348-014-1740-6

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