Hydraulic Jumps at Rounded Drop.

Hager, W.H.; Kawagoshi, N.

doi:10.1680/iicep.1990.11875

Cited by 16 publications

(3 citation statements)

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“…From studies on low tail water level effects on the formation of hydraulic jump over abrupt drop and negative step aprons [21][22][23][24] the possible hydraulic jump types were first recognized that is likely to form over the concrete block apron. Since the elevation of this secondary apron is rather high, it does not really represent a negative step.…”

Section: Sinking and Displacement Of The Concrete Blocks Of The Horizmentioning

confidence: 99%

Secondary depressed apron for scour reduction downstream of diversion barrages

Mishra¹

2019

FMRIJ

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Section: Sinking and Displacement Of The Concrete Blocks Of The Horizmentioning

confidence: 99%

Secondary depressed apron for scour reduction downstream of diversion barrages

Mishra¹

2019

FMRIJ

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“…For example, the concept of a stilling basin with double shallow-water cushions is an extension of SBSWC, which has the same advantages as SBSWC, but with better hydraulic characteristics [8], lower underflow speed, and better distribution of dynamic pressures of bottom plate of the stilling basin. The stilling basin with a drop sill is similar to SBSWC in shape [9][10][11][12][13][14]. However, the former one is focused on the connection type of a drop sill at the stilling basin inlet, while the latter one is focused on the energy dissipation mechanism of the stilling basin and the effect of the shallow-water cushion.…”

Section: Introductionmentioning

confidence: 99%

Study on the Best Depth of Stilling Basin with Shallow-Water Cushion

Liao

2018

Water

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The depth of the stilling basin with shallow-water cushion (SBSWC) is a key factor that affects the flow regime of hydraulic jump in the basin. However, the specific depth at which the water cushion is considered as 'shallow' has not been stated clearly by far, and only conceptual description is provided. Therefore, in order to define the best depth of SBSWC and its relationship between the Froude number at the inlet of the stilling basin, a large number of experiments were carried out to investigate SBSWC. First of all, 30 cases including five different Froude numbers and six depths were selected for which large eddy simulation (LES) was firstly verified by the experiments and then adopted to calculate the hydraulic characteristics in the stilling basin. Finally, three standards, based on the flow regime of hydraulic jump, the location of the main stream and the energy dissipation rate, were proposed to define the best depth of SBSWC. The three criteria are as follows: (1) a complete hydraulic jump occurs in the basin (2) the water cushion is about 1/10-1/3 deep of the stilling basin, and (3) the energy dissipation rate is more than 70% and the unit volume energy dissipation rate is as high as possible. It showed that the best depth ratio of SBSWC (depth to length ratio) was between 0.1 and 0.3 and it also indicated the best depth increased with the increase in Froude number. The results of the work are of significance to the design and optimizing of SBSWC.

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“…Sometimes an abrupt drop is introduced to prevent tailwater effects and to stabilise the jump location. The transition from supercritical to subcritical flow at an abrupt drop affects the design and construction of the stilling basins (e.g., [3][4][5][6]). …”

Section: Introductionmentioning

confidence: 99%

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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Hydraulic Jumps at Rounded Drop.

Cited by 16 publications

References 0 publications

Secondary depressed apron for scour reduction downstream of diversion barrages

Secondary depressed apron for scour reduction downstream of diversion barrages

Study on the Best Depth of Stilling Basin with Shallow-Water Cushion

SPH Modelling of Hydraulic Jump Oscillations at an Abrupt Drop

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