Numerical studies regarding the influence of entrapped air on the hydraulic performance of gullies are nonexistent. This is due to the lack of a model that simulates the air-entrainment phenomena and consequently the entrapped air. In this work, we used experimental data to validate an air-entrainment model that uses a Volume-of-Fluid based method to detect the interface and the Shear-stress transport k-ω turbulence model. The air is detected in a sub-grid scale, generated by a source term and transported using a slip velocity formulation. Results are shown in terms of free-surface elevation, velocity profiles, turbulent kinetic energy and discharge coefficients. The air-entrainment model allied to the turbulence model showed a good accuracy in the prediction of the zones of the gully where the air is more concentrated.
Numerical and experimental study of the fundamental flow characteristics of a 3D gully box under drainage
Pedro Lopes, Rita F. Carvalho, Jorge Leandro; Numerical and experimental study of the fundamental flow characteristics of a 3D gully box under drainage. Water Sci Technol 12 May 2017; 75 (9): 2204–2215. doi: https://doi.org/10.2166/wst.2017.071
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