Author(s): Byungjoo Kim; Joongcheol Paik
Linked Author(s): Joongcheol Paik
Keywords: Hydraulic jump; Turbulent flow; Air entrainment; Numerical modeling
Abstract: A hydraulic jump is numerically reproduced by a multifluid method at a Froude number of 7.5 and at the Reynolds number of 66,000. A large-eddy simulation with a localized dynamic sub-grid model is carried out for resolving the turbulence flow. The free surface fluctuation, intense air entrainment, and segregated and dispersed flow behaviors are modeled by a hybrid VOF (volume of fluid) multifluid method. Our numerical results clearly reveal the location of jump toe, the length of hydraulic jump, significant air entrainment and intense pressure and velocity fluctuations which are comparable with experimental measurements. Based on the good agreement of computed time-averaged velocity and pressure fields and their turbulence statistics with the measurement, the present numerical solutions further elucidate the rich, three-dimensional dynamics of the free surface, shear layer near the bottom and jump roller above the shear layer.
Year: 2020