Air–water flows

D Valero, S Felder, M Kramer, H Wang… - Journal of Hydraulic …, 2024 - Taylor & Francis
High Froude-number open-channel flows can entrain significant volumes of air, a
phenomenon that occurs continuously in spillways, in free-falling jets and in hydraulic …

Influence of VOF technique, turbulence model and discretization scheme on the numerical simulation of the non-aerated, skimming flow in stepped spillways

A Bayon, JP Toro, FA Bombardelli, J Matos… - Journal of hydro …, 2018 - Elsevier
An accurate description of the hydrodynamics in the non-aerated region of the skimming
flow on stepped spillways is of outmost importance, particularly in small structures at large …

Cavitation potential of flow on stepped spillways

KW Frizell, FM Renna, J Matos - Journal of Hydraulic Engineering, 2013 - ascelibrary.org
Cavitation on spillways has proven to be an undesirable condition. The formation of vapor-
filled bubbles and cavities and their eminent collapse has led to significant damage to major …

Reformulating self-aeration in hydraulic structures: Turbulent growth of free surface perturbations leading to air entrainment

D Valero, DB Bung - International Journal of Multiphase Flow, 2018 - Elsevier
A new formulation for the prediction of free surface dynamics related to the turbulence
occurring nearby is proposed. This formulation, altogether with a breakup criterion, can be …

Discharge coefficient and energy dissipation over stepped spillway under skimming flow regime

H Shahheydari, EJ Nodoshan, R Barati… - KSCE Journal of Civil …, 2015 - Elsevier
Stepped spillways have a wide range of applicability as a hydraulic structure in large dams
to dissipate energy of high-velocity flows at a downstream area of dams as well as release …

Numerical modeling of self-aerated flows: Turbulence modeling and the onset of air entrainment

F Zabaleta, FA Bombardelli, S Márquez Damián - Physics of Fluids, 2024 - pubs.aip.org
Numerical modeling of self-aerated flows is essential for understanding water systems and
designing hydraulic structures. This work discusses and extends a theoretical/numerical …

Hydraulics of the develo** flow region of stepped spillways. I: Physical modeling and boundary layer development

G Zhang, H Chanson - Journal of Hydraulic Engineering, 2016 - ascelibrary.org
On a stepped spillway, the steps act as macroroughness elements, contributing to enhanced
energy dissipation and significant aeration. In a skimming flow, the upstream flow motion is …

Effect of 30-degree slo** smooth and stepped chute approach flow on the performance of a classical stilling basin

I Stojnic, M Pfister, J Matos… - Journal of Hydraulic …, 2021 - ascelibrary.org
Advances in dam construction techniques have significantly increased the number of
stepped spillways implemented worldwide. Although stepped chutes provide enhanced …

Extreme pressures and risk of cavitation in steeply slo** stepped spillways of large dams

J Matos, CK Novakoski, R Ferla, MG Marques… - Water, 2022 - mdpi.com
Stepped spillways have been increasingly used to handle flood releases from large dams
associated with hydropower plants, and it is important to evaluate the fluctuating pressure …

Development of the interfacial air layer in the non-aerated region of high-velocity spillway flows. Instabilities growth, entrapped air and influence on the self-aeration …

D Valero, DB Bung - International Journal of Multiphase Flow, 2016 - Elsevier
Self-aeration is traditionally explained by the water turbulent boundary layer outer edge
intersection with the free surface. This paper presents a discussion on the commonly …