Further investigation on the resonance of free-surface waves provoked by floodgate maneuvers: Negative surge waves

Triki, Ali

doi:10.1016/j.oceaneng.2017.02.003

Cited by 27 publications

(7 citation statements)

References 24 publications

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“…A positive surge in an open channel is a sudden increase of flow depth that looks like a moving hydraulic jump; it can be generated by either natural or artificial causes [1][2][3][4][5]. The early contributions on surges include the works of Favre [6], Benjamin and Lighthill [7], and Peregrin [8].…”

Section: Introductionmentioning

confidence: 99%

Positive Surge Propagation in Sloping Channels

Viero

Peruzzo

Defina

2017

Water

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A simplified model for the upstream propagation of a positive surge in a sloping, rectangular channel is presented. The model is based on the assumptions of a flat water surface and negligible energy dissipation downstream of the surge, which is generated by the instantaneous closure of a downstream gate. Under these hypotheses, a set of equations that depends only on time accurately describes the surge wave propagation. When the Froude number of the incoming flow is relatively small, an approximate analytical solution is also proposed. The predictive ability of the model is validated by comparing the model results with the results of an experimental investigation and with the results of a numerical model that solves the full shallow water equations

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Section: Introductionmentioning

confidence: 99%

Positive Surge Propagation in Sloping Channels

Viero

Peruzzo

Defina

2017

Water

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“…This occurrence, as well as the other behaviours outlined and discussed in the present work, are of practical interest since sluice gates are widely used in laboratory experiments (e.g. Peruzzo, Viero, & Defina, 2016;Reichstetter & Chanson, 2013;Viero, Pradella, & Defina, 2017), as well as for flow control in open channels (Ansar & Chen, 2009;Triki, 2014Triki, , 2017, for example to control the upstream flow depth as an alternative to weir sills in the presence of large bedload. Thus, an in-depth knowledge of the hydraulic behaviour of this movable device is important in the effective design and operation of flow control systems.…”

Section: Discussionmentioning

confidence: 64%

Multiple states in the flow through a sluice gate

Viero

Defina

2018

Journal of Hydraulic Research

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This paper addresses the problem of hydraulic hysteresis for a supercritical open channel flow approaching a sluice gate when subcritical flow can establish downstream, against the gate. The possible flow configurations across the gate are classified on the basis of the Froude number of the incoming and downstream flows, and of the ratio of gate opening to the upstream supercritical flow depth. Within the above parameter space, two regions exist in which the problem admits a dual solution, that is, two different flow configurations can establish for the same gate opening and undisturbed flow conditions. In one of these regions, both smooth flow (i.e. the fluid flows under the gate without interacting with the gate) and free outflow conditions can establish; in the other region, both smooth flow and submerged flow can establish. For flow conditions in the above regions, the configuration that actually establishes depends on the previous history of the flow, thus implying the hysteretic character of the flow. Journal of Hydraulic Research VieroDefina˙MultipleStatesSluiceGatesupstream flow conditions; the two flow configurations that can occur are (i) the supercritical flow remains supercritical through the obstacle, or (ii) a supercritical to subcritical transition (i.e. a hydraulic jump) occurs upstream of the obstacle, and critical condition establishes at the obstacle. Recently, Viero & Defina (2017) demonstrated that hydraulic hysteresis can occur also when subcritical flow can establish just downstream of, and possibly against an obstacle. In the presence of a downstream subcritical flow against the obstacle, the problem complicates since it has one more degree of freedom (i.e. the downstream flow conditions), and the number of possible flow configurations increases significantly. The two flow configurations that can establish through the obstacle are (i) supercritical smooth flow configuration, i.e. the flow remains supercritical in passing the obstacle and supercritical to subcritical transition occurs downstream of the obstacle; (ii) subcritical smooth flow configuration, i.e. the supercritical to subcritical transition occurs upstream of the obstacle and the flow remains subcritical through (and downstream of) the obstacle. For illustration purposes, Viero & Defina (2017) applied the theory to two specific obstacles, namely a raised bed hump and a channel contraction.By extending the work of Defina and Susin (2003) in the light of the more general framework of Viero & Defina (2017), i.e. the possible presence of a downstream subcritical flow, the present work focuses on the flow through a vertical sluice gate, for which the hysteretic behaviour concerns the possibility that, for a given gate opening, a supercritical approaching flow may either remain supercritical without interacting with the gate, or undergo a supercritical to subcritical transition upstream of the gate, with the flow through the gate that can be either free or submerged depending on the downstream flow conditions. Anyway, the state that ...

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“…18. High velocity region is seen near the box while particles far from this region remain almost (27) The vortex generated next to the box moves downstream and finally disappears at larger times. Some characteristic lengths representing the shape of the plunging wave near the box are measured at time 0.285 s during the experiment [23] and shown in Fig.…”

Section: Scott Russell Wave Generatormentioning

confidence: 98%

“…In spite of extensive use of the conventional numerical approaches such as the finite difference (FD) and the finite element (FE), these methods need special treatment to track free surface location in different times because of their Eulerian features. However, many different practical problems such as shallow water equations, resonance of free surface waves provoked by floodgate maneuvers and water hammer simulation have been analyzed using FD [25,27,28] and FE [24,26] approaches. As a remedy, flexible Lagrangian mesh-free numerical approaches in which function approximation is performed without special connections between computational nodes as required in the conventional mesh-based methods have been introduced and extensively applied for simulation of different engineering problems.…”

Section: Introductionmentioning

confidence: 99%

Modified incompressible SPH method for simulating free surface problems using highly irregular multi-resolution particle configurations

Shobeyri

Ardakani

2019

J Braz. Soc. Mech. Sci. Eng.

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In this study, the conventional incompressible smoothed particle hydrodynamics (I-SPH) formulations are modified to be applicable for highly irregular multi-resolution particle distributions for simulation of transient free surface flows. The modifications are based on distinguishing between particle density calculated by interpolation functions in SPH method and fluid density as a physical quantity. I-SPH is a fully Lagrangian method having great potential in dealing with large deformations of the free surface. Flow domain is discretized into a set of moving particles, and each particle carries mass, velocity and pressure during simulation time. Variations in these field parameters can be determined by temporal discretization of Navier-Stokes equation followed by a spatial discretization using I-SPH method. In addition to this, three pressure gradient models are employed for simulation of free surface flows to examine efficiency of the models coupled with the modifications. Furthermore, a simple and efficient method to find free surface particles which is compatible with highly irregular multiresolution particle distributions is proposed. The modified approach is tested against different free surface problems using highly irregular particle configurations. The classic pressure gradient model employed in SPH method coupled with constant smoothing distance gives accurate results with lower computational times over highly irregular particle distributions. The method can be applied for adaptive refinement strategy to reduce computational times of transient free surface problems.

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Further investigation on the resonance of free-surface waves provoked by floodgate maneuvers: Negative surge waves

Cited by 27 publications

References 24 publications

Positive Surge Propagation in Sloping Channels

Positive Surge Propagation in Sloping Channels

Multiple states in the flow through a sluice gate

Modified incompressible SPH method for simulating free surface problems using highly irregular multi-resolution particle configurations

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