Tailwater level effects on flow conditions at an abrupt drop

Mossa, Michele; Petrillo, Antonio; Chanson, Hubert

doi:10.1080/00221680309499927

Cited by 40 publications

(26 citation statements)

References 16 publications

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“…The geometrical setup was based on the experimental study by [16], who focused on the oscillating changes of the different types of hydraulic jumps (variation from one type to another). See Table 1 for experimental data.…”

Section: Numerical Tests and Resultsmentioning

confidence: 99%

“…The walls and bottoms of both channels were made of Plexiglas ( Figure 2). The channel hosted in recent years widespread experimental activity on hydraulic jump characterization (see, for instance, [11,12,17,[51][52][53]). In the SIA channel, the abrupt drop was made of Plexiglas and located 0.8 m downstream of the gate.…”

Section: Experimental Set Upmentioning

confidence: 99%

“…The experiments by [16] took into account the previous studies to assess critically the basic flow patterns for the transition from super-to subcritical flows at an abrupt drop and to propose new compelling conclusions regarding the changes of the different types of hydraulic jumps and the variation from one type to another: in particular, it was noted that specific flow conditions can lead to cyclic oscillations between jump types, resulting in the cyclic formation and evolution of jump vortices.…”

Section: Introductionmentioning

confidence: 99%

“…The literature is unclear on the conditions leading to oscillating jumps and cyclic behaviours. Experiments by [16] presented diagrams on the flow patterns as a function of Froude number and dimensionless downstream depth, highlighting some doubts about the existence of the wave-and B-jumps, and these graphs did not mention oscillating characteristics.…”

Section: Introductionmentioning

confidence: 99%

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SPH Modelling of Hydraulic Jump Oscillations at an Abrupt Drop

Padova

Mossa

Sibilla

2017

Water

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This paper shows the results of the numerical modelling of the transition from supercritical to subcritical flow at an abrupt drop, which can be characterised by the occurrence of oscillatory flow conditions between two different jump types. Weakly-Compressible Smoothed Particle (WCSPH) model was employed and both an algebraic mixing-length model and a two-equation model were used to represent turbulent stresses. The purpose of this paper is to obtain through the SPH model a deeper understanding of the physical features of a flow, which is, in general, difficult to be reproduced numerically, owing to its unstable character. In particular, the experience already gained in SPH simulations of vorticity-dominated flows allows one to assess the fluctuations of hydrodynamic characteristics of the flow field, (e.g., free surface profile downstream of the jump, velocity, pressure and vorticity). Numerical results showed satisfactory agreement with measurements and most of the peculiar features of the flow were qualitatively and quantitatively reproduced.

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Section: Numerical Tests and Resultsmentioning

confidence: 99%

Section: Experimental Set Upmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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SPH Modelling of Hydraulic Jump Oscillations at an Abrupt Drop

Padova

Mossa

Sibilla

2017

Water

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“…These structures may generate a free-falling nappe associated often with a scour hole (Chanson 1995, 1996, Chanson and Toombes 1998, Mossa et al 2003, Chanson and Gualtieri 2008, yet the drop force is rarely discussed. The aim of this study is therefore to predict the drop force and the drop length of free-falling jets by semitheoretical equations and regression techniques.…”

Section: Introductionmentioning

confidence: 99%

Drop characteristics of free-falling nappe for aerated straight-drop spillway

Hong

Huang

Wan

2010

Journal of Hydraulic Research

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A parallel study of regression and semi-theoretical equations is presented to forecast the drop force and the drop length of a free-falling nappe for an aerated straight-drop spillway. The ratio between the critical velocity and the exit velocity at the drop wall was introduced to establish semi-theoretical equations. Regression techniques were applied by using the dimensionless channel bed slope and the drop number to describe the drop characteristics. There were 64 groups of test data to calibrate the parameters of equations. Another 36 groups of test data were used to verify the developed model. The simulation results indicate that the semi-theoretical method provides reliable estimates for the drop force, and that the regression method can offer accurate predictions for the drop length.

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