CFD modeling of flow pattern in spillway’s approach channel

Parsaie, Abbas; Haghiabi, Amir Hamzeh; Moradinejad, Amir

doi:10.1007/s40899-015-0020-9

Cited by 55 publications

(21 citation statements)

References 19 publications

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“…Moreover, CFD simulations have been employed to solve hydraulic engineering problems successfully. Hence, developing a simulation which is capable of reflecting the results of actual experiments is of great practical value [13][14][15][16][17][18]. The models presented in this paper could be potentially applied in engineering applications, such as leak control in the water supply industry, filledtower optimization in the chemical industry, and drip irrigation design in agricultural irrigation.…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical modeling of sidewall orifices

Cheng

Shen

2020

SN Appl. Sci.

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The discharge coefficient of an orifice is important for the outflow through the orifice. While it cannot be quantified theoretically as the outflow through an orifice depends on a number of parameters such as the pipe pressure, the liquid velocity and the shape and the area of the orifice. In this study, experiments and computational fluid dynamics (CFD) simulations were performed to find out the factors influencing discharge coefficient and the corresponding mechanism. The CFD simulation is based on Navier-Stokes equations combined with RNG k − ε turbulence model. The results show that a negative exponential function could fit the relationship between orifice discharge coefficient, pipe pressure, and orifice area more accurately. The relationship between the discharge coefficient of the orifice and the velocity was linear. In general, the simulation results fit well with the experimental results, which indicates that CFD simulation could be used to study pipeline leakage.Keywords Outflow · Orifice · Velocity · Pressure · Numerical model · Computational fluid dynamics (CFD) Abbreviations Q totalThe inlet flow rate, m 3 /s Q outThe outflow rate, m 3 /s Q endThe outlet flow rate, m 3 /s A crossThe area of the cross-section, m 2 k aThe ration of the orifice area which represents the relative size of the orifice area H 1The upstream water head, m P a Atmospheric pressure, P a ρThe water density, kg/m 3 gThe gravity constant, 9.8 m/s 2 α 0The kinetic energy correction factor of the inlet flow ν comeThe upstream velocity, m/s P outThe pressure of the shrinkage section out of the orifice, P a α outThe kinetic energy correction factor of the orifice outflow h w

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Section: Introductionmentioning

confidence: 99%

Experimental and numerical modeling of sidewall orifices

Cheng

Shen

2020

SN Appl. Sci.

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“…Such a model is described in Hirt and Nichols [34]. Since its commercial release, FLOW-3D has been used in research, providing to engineers valuable insight into many physical flow processes [35][36][37][38].…”

Section: Model Descriptionmentioning

confidence: 99%

Computational Fluid Dynamics for Modeling Gravity Currents in the Presence of Oscillatory Ambient Flow

Stancanelli¹,

Musumeci²,

Foti³

2018

Water

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Gravity currents generated by lock release are studied in the case of initially quiescent ambient fluid and oscillating ambient fluid (regular surface waves). In particular, the dynamics of the density currents are investigated by means of CFD numerical simulations. The aim is to evaluate the influence of the ambient fluid velocity field on the observed mixing and turbulent processes. Results of two different turbulence closure models, namely the standard k − ε turbulence model and the LES model, are analyzed. Model predictions are validated through comparison with laboratory measurements. Results show that the k − ε model is able to catch the main current propagation parameters (e.g., front velocity at the different phases of the evolution of the current, gravity current depth, etc.), but that a LES model provides more realistic insights into the turbulent processes (e.g., formation of interfacial Kelvin-Helmholtz billows, vortex stretching and eventual break up into 3D turbulence). The ambient fluid velocity field strongly influences the dynamics of the gravity currents. In particular, the presence of an oscillatory motion induces a relative increase of mixing at the front (up to 25%) in proximity of the bottom layer, and further upstream, an increase of the mixing process (up to 60%) is observed due to the mass transport generated by waves. The observed mixing phenomena observed are also affected by the ratio between the gravity current velocity v f and the horizontal orbital velocity induced by waves u w , which has a stronger impact in the wave dominated regime (v f /u w < 1).

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“…To model hydraulic characteristics, several methods such as physical and numerical methods can be used. Nowadays, by utilizing new methods in computational fluid dynamics (CFD) and with the development of fast computers, numerical methods have become accessible for use in the analysis of such sophisticated flows [8,9]. Studies on the flow through the hydraulic structures are usually conducted using physical modeling.…”

Section: Introductionmentioning

confidence: 99%

Research on the Optimization Design of Abnormal Flip Buckets

Wang

2020

Mathematical Problems in Engineering

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This study constructs an optimization model to address ski-jump energy dissipation problems in different reservoir environments. The multiobjective genetic algorithm is herein applied as the calculation method. In the process of changing the ski-jump flow model, the runoff of ski-jump flow is changed (especially the abnormal flip bucket). Water flow might go from having a single falling point to multiple falling points. Optimization is only performed after the stabilization of the fall of the water because the fall of the water from the starting point to the ground is not stable over a short period. Only a stable flow can reduce the computation time for optimization. The optimal overflow width and height of the flip bucket were calculated through optimal computation, which can minimize the scouring force of the water flow as it falls to the ground. The results obtained provide theoretical references for practical engineering and reduce the potential safety hazards. The energy in flip buckets following the optimization of the water flow can be fully dissipated, creating an ecosystem where water can flow unobstructed. Guiding a water flow to water-deficient areas is of great significance in ensuring the long-term protection of environments and ecosystems.

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CFD modeling of flow pattern in spillway’s approach channel

Cited by 55 publications

References 19 publications

Experimental and numerical modeling of sidewall orifices

Experimental and numerical modeling of sidewall orifices

Computational Fluid Dynamics for Modeling Gravity Currents in the Presence of Oscillatory Ambient Flow

Research on the Optimization Design of Abnormal Flip Buckets

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