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Numerical and experimental study of the fundamental flow characteristics of a 3D gully box under drainage
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Numerical and experimental study of the fundamental flow characteristics of a 3D gully box under drainage
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Journal Article
Numerical and experimental study of the fundamental flow characteristics of a 3D gully box under drainage
2017
Overview
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.
