A multi-fluid modelling approach for the air entrainment and internal bubbly flow region in hydraulic jumps

This paper proposed a numerical modelling framework aiming to couple both Volume-Of-Fluid (VOF) model and MUltiple-SIze-Group (MUSIG) model to handle the formation of large-scale free surface, bubble entrainment and bubble dispersion in hydraulic oscillating jumps. To consider all essential physics,...

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Bibliographic Details
Published in:Ocean engineering 2014-11, Vol.91, p.51-63
Main Authors: Xiang, M., Cheung, S.C.P., Tu, J.Y., Zhang, W.H.
Format: Article
Language:English
Subjects:
Air entrainment
Applied sciences
Bubbles
Bubbly flow
Buildings. Public works
Computational fluid dynamics
Entrainment
Exact sciences and technology
Fluid flow
Hydraulic constructions
Hydraulic jump
Hydraulics
Marine
Mathematical models
Modelling
MUSIG
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Summary:This paper proposed a numerical modelling framework aiming to couple both Volume-Of-Fluid (VOF) model and MUltiple-SIze-Group (MUSIG) model to handle the formation of large-scale free surface, bubble entrainment and bubble dispersion in hydraulic oscillating jumps. To consider all essential physics, the modelling framework resolves and couples the flow structure of three different fluids (i.e. continuous air and water and dispersed air bubbles) using the Eulerian–Eulerian multi-fluid approach. To model the air entrainment at the jump toe, a sub-grid scale air entrainment model was also implemented within the framework. To evaluate the capability of the proposed model, model predictions were validated against experimental data of (Chachereau and Chanson, 2010). Comparisons between predicted and measured results are in satisfactory agreement demonstrating the potential of the proposed methodology. Discussions on the drawbacks and deficiencies of the current model are also included. •A numerical model coupling the VOF and the MUSIG model is proposed.•A sub-grid scale air entrainment model is integrated into the numerical model.•We examine both the external and internal structures of the hydraulic jump flow.•The bubble size evolution process due to air entrainment is resolved.•The Froude number effect on the distribution of bubbly flow parameters is studied.
ISSN:0029-8018
1873-5258
DOI:10.1016/j.oceaneng.2014.08.016