scholarly journals Numerical investigation of air-entrainment in skimming flow over stepped spillways

2016 ◽  
Vol 6 (3) ◽  
pp. 139-142 ◽  
Author(s):  
Jiemin Zhan ◽  
Jianbo Zhang ◽  
Yejun Gong
Keyword(s):  
Numerical Investigation ◽  
Air Entrainment ◽  
Stepped Spillways

scholarly journals An improved air entrainment model for stepped spillways

2021 ◽  
Author(s):  
Silje Kreken Almeland ◽  
Timofey Mukha ◽  
Rickard E. Bensow
Keyword(s):  
Air Entrainment ◽  
Stepped Spillways

NUMERICAL SIMULATION OF AIR ENTRAINMENT ON STEPPED SPILLWAYS

2019 ◽  
Author(s):  
ZONGSHI DONG ◽  
JUNXING WANG ◽  
DAVID FLORIAN VETSCH ◽  
ROBERT MICHAEL BOES ◽  
GUANGMING TAN
Keyword(s):  
Numerical Simulation ◽  
Air Entrainment ◽  
Stepped Spillways

Prediction of Air Entrainment in Skimming Flow over Stepped Spillways Using Numerical Methods

2019 ◽  
Author(s):  
JACOB VAN ALWON ◽  
DUNCAN BORMAN ◽  
JORGE MATOS ◽  
NIK KAPUR ◽  
ANDREW SLEIGH
Keyword(s):  
Numerical Methods ◽  
Air Entrainment ◽  
Stepped Spillways

scholarly journals Numerical investigation of flow characteristics over stepped spillways

2020 ◽  
Author(s):  
Aytaç Güven ◽  
Ahmed Hussein Mahmood
Keyword(s):  
Numerical Model ◽  
Turbulent Flow ◽  
Flow Characteristics ◽  
Air Entrainment ◽  
Stepped Spillway ◽  
Stepped Spillways ◽  
Entrainment Velocity ◽  
Fluid Flow Characteristics ◽  
3D Package ◽  
Good Agreement

Abstract Spillways are constructed to evacuate the flood discharge safely not to let the flood wave overtop the dam body. There are different types of spillways, ogee type being the conventional one. Stepped spillway is an example of nonconventional spillways. The turbulent flow over stepped spillway was studied numerically by using the Flow-3D package. Different fluid flow characteristics such as longitudinal flow velocity, temperature distribution, density and chemical concentration can be well simulated by Flow-3D. In this study, the influence of slope changes on flow characteristics such as air entrainment, velocity distribution and dynamic pressures distribution over the stepped spillway was modelled by Flow-3D. The results from the numerical model were compared with the experimental study done by others in the literature. Two models of the stepped spillway with different discharge for each model was simulated. The turbulent flow in the experimental model was simulated by the Renormalized Group (RNG) turbulence scheme in the numerical model. A good agreement was achieved between the numerical results and the observed ones, which were exhibited in terms of graphics and statistical tables.

Numerical investigation of skimming flow characteristics over non-uniform gabion-stepped spillways

2021 ◽  
Vol 6 (4) ◽  
Author(s):  
Ali Adel Zuhaira ◽  
Rwayda Kh. S. Al-Hamd ◽  
Saif Alzabeebee ◽  
Lee S. Cunningham
Keyword(s):  
Numerical Investigation ◽  
Flow Characteristics ◽  
Stepped Spillways

scholarly journals NUMERICAL STUDY OF TURBULENT FLOW FOR MODERATE-SLOPE STEPPED SPILLWAYS

2018 ◽  
Vol 30 (1) ◽  
Author(s):  
Bentalha Chakib
Keyword(s):  
Hydraulic Structure ◽  
Numerical Study ◽  
Air Entrainment ◽  
Work Flow ◽  
Stepped Spillway ◽  
Cavitation Damage ◽  
Stepped Spillways ◽  
Vof Model ◽  
Computational Fluid Dynamics Cfd ◽  
Stepped Chute

Stepped spillway is a power full hydraulic structure for energy dissipation because ofthe large value of the surface roughness. The performance of the stepped spillway is enhancedwith the presence of air that can prevent or reduce the cavitation damage. This work aims tosimulate air entrainment and determine the characteristics of flow at stepped spillways. Withinthis work flow over stepped chute is simulated by using fluent computational fluid dynamics(CFD). The volume of fluid (VOF) model is used as a tool to simulate air-water interaction onthe free surface thereby the turbulence closure is derived in the k −ε turbulence standard model.The found numerical results agree well with experimental results.

scholarly journals Experimental Investigation of Artificial Aeration on a Smooth Spillway with a Crest Pier

Water ◽  
2018 ◽  
Vol 10 (10) ◽  
pp. 1383 ◽  
Author(s):  
Juan Luna-Bahena ◽  
Oscar Pozos-Estrada ◽  
Víctor Ortiz-Martínez ◽  
Jesús Gracia-Sánchez
Keyword(s):  
Shock Waves ◽  
Hydraulic Structure ◽  
Standing Waves ◽  
Experimental Tests ◽  
Air Entrainment ◽  
Air Concentration ◽  
Cavitation Damage ◽  
Stepped Spillways ◽  
Artificial Aeration ◽  
And Shock Waves

Crest piers placed on overflow spillways induce standing waves at the downstream end of them and the supercritical flow expands after flowing past the rear of the pier. The expanding flow from each side of a pier will intersect and form disturbances or shock waves that travel laterally as they move downstream and eventually reach the chute sidewalls. Recently, investigations regarding crest piers are related with artificial aeration on stepped spillways to eliminate the risk of cavitation damage. However, there is a lack of studies on standing and shock waves in smooth spillways concerning the air entrainment into the flow in presence of crest piers. This paper presents the study of the combined effect on air entrainment of a crest pier and an aerator on the bottom of a smooth spillway (configuration 1). For comparison, experimental tests were developed in the spillway without pier, that is in presence of aerator only (configuration 2). The configuration 1 results show that the air concentration distribution on the spillway bottom across the width and length of the chute increases in comparison with configuration 2, reducing even more the risk of cavitation damage and enhancing the safety of the hydraulic structure.

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