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, 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.