Investigation of Hydraulic Characteristics and Air Concentration of a 3D Simulated Air-Water Flow on a Spillway with an Aerator Device (A case study)

Shayanseresht, Saeed; Manafpour, Mohammad

doi:10.1080/09715010.2020.1856732

Cited by 3 publications

(2 citation statements)

References 13 publications

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“…The flow gets into the concave curvature of the bucket and goes upwards. The pressure gained from the centrifugal force at the curvature causes higher bottom static pressure [39]. Fig.…”

Section: Resultsmentioning

confidence: 97%

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A Comparative Assessment of Various Turbulence Models Applied for Simulation of Air-Water Flow Over Chute Spillway

Shayanseresht

Manafpour

2021

Period. Polytech. Civil Eng.

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Chute aerators have been largely used to reduce cavitation hazard in high head spillways. There is no definite turbulence model for simulating these devices in smooth spillways in spite of its importance in critical conditions. A simulation in two-phase air-water chute flow and its aerator with five different turbulence models (RNG, Standard and Realizable k–ε Models, SST and Standards k–ω Models) has been numerically investigated by Fluent software. Finite Volume and VOF methods were used for discretization of flow equations and free surface modeling. Flow depth, velocity and bottom pressure comparison were made along with the air cavity length determination by numerical, experimental and reference equations. The best model with the minimum value of error percentage for flow depth and velocity was RNG k–ε turbulence model. The realizable and RNG k–ε turbulence models showed better results for the pressure head at the bottom of the chute. The RNG k–ε model results for the jet length have a very slight difference with the experimental results. The length of the cavity is closely associated with the flow emergence angle θ’ over aerators. The bottom air concentration of spillway chute simulated by all the turbulence models, except for the RNG k–ε model, can be overestimated and therefore may affect the designing of aerator geometry.

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“…The flow gets into the concave curvature of the bucket and goes upwards. The pressure gained from the centrifugal force at the curvature causes higher bottom static pressure [39]. Fig.…”

Section: Resultsmentioning

confidence: 97%

“…The obtained results of the same study led to numerical simulation for the Gavoshan spillway that was equipped with an aerator instrument on the chute bed. Air concentration distribution in the vicinity and downstream of the aerator was calculated by Shayanseresht and Manafpour [39].…”

Section: Resultsmentioning

confidence: 99%

A Comparative Assessment of Various Turbulence Models Applied for Simulation of Air-Water Flow Over Chute Spillway

Shayanseresht

Manafpour

2021

Period. Polytech. Civil Eng.

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Pore-scale permeability estimation of undisturbed granite residual soil: A comparison study by different methods

Que,

Chen,

Jiang

et al. 2024

J Soils Sediments

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Numerical Simulation of Air Distribution in a Wide Chute

Shayanseresht

2024

Archives of Hydro-Engineering and Environmental Mechanics

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Desirable conditions of airflow should be provided for spillway chute aerators in two-phase air-water flow, especially in large-width chutes. There is no general approach to determine air entrainment, concentration distribution, and submergence along a chute introduced by an aerator shaft. The two-phase air-water modeling of Gavoshan dam in Iran as a case study of chute flow, its aerator, and the characteristics of flow into the cavity formed below the jet have been numerically investigated, and the results obtained have been validated against the laboratory experiments. The hydraulic parameters of the cavity and aerator shaft were determined to evaluate their performance and emphasize the importance of a proper aerator design. Sections with a greater distance from the bottom of the chute exhibit higher pressure magnitudes, while the mean air concentration values in the cavity are smaller in sections close to a ramp. Higher water discharge, lower pressure head in sections near the bottom of the cavity, and lower air concentration in sections near the ramp into the cavity increase the probability of cavitation occurrence.

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Investigation of Hydraulic Characteristics and Air Concentration of a 3D Simulated Air-Water Flow on a Spillway with an Aerator Device (A case study)

Cited by 3 publications

References 13 publications

A Comparative Assessment of Various Turbulence Models Applied for Simulation of Air-Water Flow Over Chute Spillway

A Comparative Assessment of Various Turbulence Models Applied for Simulation of Air-Water Flow Over Chute Spillway

Pore-scale permeability estimation of undisturbed granite residual soil: A comparison study by different methods

Numerical Simulation of Air Distribution in a Wide Chute

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