SPHysics Simulation of Experimental Spillway Hydraulics

Gu, Song; Ren, Liqun; Wang, Xing; Xie, Hui; Huang, Yuefei; Wei, Jiahua; Shao, Songdong

doi:10.3390/w9120973

Cited by 15 publications

(8 citation statements)

References 46 publications

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“…What Eq. (19) explains is that ∆ moves away from 0 with ε increasing. So scaling effects on the stream-wise velocity profile would increase with distortion ratio.…”

Section: Zhang Et Al / Desalination and Water Treatment 149 (2019mentioning

confidence: 99%

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Prediction and correction of scaling effects on velocity profile in hydraulic laboratory experiments

Zhang¹,

Wang²,

Chen³

et al. 2019

Desalination and Water Treatment

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Due to the geometric distortion in distorted hydraulic laboratory experiments, velocity profile cannot maintain as constant as required by the traditional criteria. Scaling effects, which lack quantitative researches, cannot be avoided even if the Froude and drag coefficient similitude criteria were satisfied. Prediction formulas of scaling effect rate are established in this research to theoretically reveal the quantitative relations between velocity profile distortion and experimental parameters. They are directly related to three parameters, distorted ratio, relative water depth, and relative bed roughness. In vertical direction, most effects happen near the bed and the deviation increases with distortion ratio. The similarity of secondary flow is worse and more complicated than that of stream-wise flow. The correction method, which is the improvement of traditional similitude criteria, can effectively reduce scaling effects when converting experimental results into their corresponding values in the prototype. Three dimensional numerical models are built to verify the accuracy of the prediction formulas and correction method.

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“…What Eq. (19) explains is that ∆ moves away from 0 with ε increasing. So scaling effects on the stream-wise velocity profile would increase with distortion ratio.…”

Section: Zhang Et Al / Desalination and Water Treatment 149 (2019mentioning

confidence: 99%

“…In addition, another significant force which must not be neglected in open channels is drag force. A kinematic similitude criteria should also include drag coefficient similarity [19]. With the combination of Chézy formula u C RJ = , the criterion is solved as [20],…”

Section: Traditional Similitude Criteriamentioning

confidence: 99%

Prediction and correction of scaling effects on velocity profile in hydraulic laboratory experiments

Zhang¹,

Wang²,

Chen³

et al. 2019

Desalination and Water Treatment

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“…The SPH method has been employed to investigate hydraulic jumps. López, Jonsson, and Gu et al [5][6][7] separately investigated the feasibility and capability of the SPH model in 2D hydraulic jumps on a flat as well as on a corrugated riverbed. Some inlet and outlet boundary algorithms for the SPH method were developed from the studies.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulations of 2D Hydraulic Jumps by a Parallel SPH Model

Lin

Mao

Ding

et al. 2021

Water

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Hydraulic jumps are a rapid transition from supercritical to subcritical flow and generally occur in rivers or spillways. Owing to the high energy dissipation rate, hydraulic jumps are widely applied as energy dissipators in hydraulic projects. To achieve efficient and accurate simulations of 2D hydraulic jumps in open channels, a parallel Weakly Compressible Smoothed Particle Hydrodynamics model (WCSPH) with Shepard Density filter was established in this study. The acceleration of the model was obtained by OpenMP to reduce execution time. To further reduce execution time, a suitable and efficient scheduling strategy was selected for the parallel numerical model by comparing parallel speed-ups under different scheduling strategies in OpenMP. Following this, two test cases of uniform flow in open channels and hydraulic jumps with different inflow conditions were investigated to validate the model. The comparison of the water depth and velocity fields between the numerical results and the analytical solution generally showed good agreement, although there was a minor discrepancy in conjugate water depths. The numerical results showed free surface undulation with decreasing amplitude, which is more consistent with physical reality, with a low inflow Froude number. Simultaneously, the Shepard filter was able to smooth the pressure fields of the hydraulic jumps with a high inflow Froude number. Moreover, the parallel speed-up was generally able to reach theoretical maximum acceleration by analyzing the performance of the model according to different particle numbers.

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“…The majority of the dam and dike failures, with their causes and effects on losses of peoples' lives, are included in many research studies [5][6][7]. The overtopping failure is occurring due to overflowing water above dike crest into downstream slope and occurred as a result of different conditions such as high water level and the change of bed level [8] as well as the extreme hydrology conditions [9], inadequate rehabilitation works [10] and the efficiency of spillway design [11]. The breach channel failure, due to overtopping moment, has occurred as a result of unsuitable design of spillway, the spillway blocked, the losses of storage capacity of dike and higher soil displacement due to earthquake failure [12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Soil Types on The Development of Matric Suction and Volumetric Water Content for Dike Embankment During Overtopping Tests

Hassan

Ismail

2018

CivileJournal

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The resistance of dike materials has a great effect on the development of hydraulic engineering around the world. It helps to understand the mechanism of dike failure occurred due to the influence of hydraulics and Geotechnical parameters. The overtopping moment is one of the main failures that reduces the stability of the dike embankment through initiating the breach channel inside dike crest as a result of water flow above the downstream slope of the dike. Two spatial overtopping tests were conducted at in Hydraulic Geotechnical laboratories at the University Sains of Malaysia to observe the evolution of matric suction and volumetric water content for two soil types of sand and very silty sand soils. A pilot channel was cut in dike crest along the side wall of the small flume channel to represent the transition water flow from upstream into downstream slopes during overtopping test. The results indicated that the matric suction decreases due to the increase of volumetric water content during the saturation of dike body. The proportion increasing and decreasing of volumetric water content and matric suction is lower in very silty sand than those in sand soil due to the presence of fine particles in previous soil.

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SPHysics Simulation of Experimental Spillway Hydraulics

Cited by 15 publications

References 46 publications

Prediction and correction of scaling effects on velocity profile in hydraulic laboratory experiments

Prediction and correction of scaling effects on velocity profile in hydraulic laboratory experiments

Numerical Simulations of 2D Hydraulic Jumps by a Parallel SPH Model

Effect of Soil Types on The Development of Matric Suction and Volumetric Water Content for Dike Embankment During Overtopping Tests

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