Inlet effects on roll-wave development in shallow turbulent open-channel flows

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Title:Inlet effects on roll-wave development in shallow turbulent open-channel flows
Creators:
Campomaggiore, Francesca; Dipartimento di Ingegneria e Architettura, Università di Trieste, Piazzale Europa 1, 34127 Trieste, Italy.
Di Cristo, Cristiana; Dipartimento di Ingegneria Civile e Meccanica, Università di Cassino e del Lazio Meridionale, Via Di Biasio 43, 03043 Cassino (FR), Italy.
Iervolino , Michele ; Dipartimento di Ingegneria Civile, Design, Edilizia ed Ambiente, Seconda Università di Napoli, Via Roma 29, 81031 Aversa (CE), Italy.
Vacca , Andrea ; vacca at unina dot it; Dipartimento di Ingegneria Civile, Design, Edilizia ed Ambiente, Seconda Università di Napoli, Via Roma 29, 81031 Aversa (CE), Italy.
Journal or Publication Title:
Journal of Hydrology and Hydromechanics, 64, 1, pp. 45-55
Uncontrolled Keywords:open-channel flows, roll-waves, hypercritial flows, numerical simulation

Abstract

The present work investigates the effect of the flow profile induced by an inlet condition on the roll-wave evolution in turbulent clear-water flows. The study employs theoretical and numerical analyses. Firstly, the influence of the inlet condition on the spatial evolution of a single perturbation in a hypercritical flow is examined through the expansion near a wavefront analysis. The results show that an accelerated unperturbed profile reduces the disturbance spatial growth. A decelerated profile causes an increase. The effect of the flow profile on the spatial evolution of rollwave trains is then numerically investigated solving the Saint Venant equations with a second-order Runge-Kutta Total Variation Diminishing (TVD) Finite Volume scheme. The numerical simulations comply with the analytical results for the initial and transition phases of the roll-wave development. The unperturbed profile influences even the roll-waves statistical characteristics in the final stage, with a more evident effect in case of accelerated profiles. The influence of the flow profile should be therefore accounted for in the formulation of predictive criteria for roll-waves appearance based on the estimation of the disturbance spatial growth rate.

Official URL: http://147.213.145.2/vc/vc1.asp

Title:Inlet effects on roll-wave development in shallow turbulent open-channel flows
Translated title:Inlet effects on roll-wave development in shallow turbulent open-channel flows
Creators:
Campomaggiore, Francesca; Dipartimento di Ingegneria e Architettura, Università di Trieste, Piazzale Europa 1, 34127 Trieste, Italy.
Di Cristo, Cristiana; Dipartimento di Ingegneria Civile e Meccanica, Università di Cassino e del Lazio Meridionale, Via Di Biasio 43, 03043 Cassino (FR), Italy.
Iervolino , Michele ; Dipartimento di Ingegneria Civile, Design, Edilizia ed Ambiente, Seconda Università di Napoli, Via Roma 29, 81031 Aversa (CE), Italy.
Vacca , Andrea ; vacca at unina dot it; Dipartimento di Ingegneria Civile, Design, Edilizia ed Ambiente, Seconda Università di Napoli, Via Roma 29, 81031 Aversa (CE), Italy.
Uncontrolled Keywords:open-channel flows, roll-waves, hypercritial flows, numerical simulation
Subjects:T Technology > TA Engineering (General). Civil engineering (General)
Divisions:Mathematics, Physics and Earth Sciences > Institute of Hydrodynamics > Journal of Hydrology and Hydromechanics
Journal or Publication Title:Journal of Hydrology and Hydromechanics
Volume:64
Number:1
Page Range:pp. 45-55
ISSN:0042-790X
Publisher:Institute of Hydrology of the Slovak Academy of Sciences and the Institute of Hydrodynamics of the Academy of Sciences of the Czech Republic
Related URLs:
URLURL Type
http://avi.lib.cas.cz/node/55Publisher
ID Code:8631
Item Type:Article
Deposited On:16 Feb 2016 11:48
Last Modified:16 Feb 2016 10:48

Citation

Campomaggiore, Francesca; Di Cristo, Cristiana; Iervolino , Michele; Vacca , Andrea (2016) Inlet effects on roll-wave development in shallow turbulent open-channel flows. Journal of Hydrology and Hydromechanics, 64 (1). pp. 45-55. ISSN 0042-790X

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