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Numerical study of a round buoyant jet under the effect of JONSWAP random waves
Authors:Yong-ping Chen  Chi-wai Li  Chang-kuan Zhang  Zhen-shan Xu
Institution:1. State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing, 210098, China
2. College of Harbor, Coastal and Offshore Engineering, Hohai University, Nanjing, 210098, China
3. Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China
Abstract:This paper presents a numerical study on the hydrodynamic behaviours of a round buoyant jet under the effect of JONSWAP random waves. A three-dimensional large eddy simulation (LES) model is developed to simulate the buoyant jet in a stagnant ambient and JONSWAP random waves. By comparison of velocity and concentration fields, it is found that the buoyant jet exhibits faster decay of centerline velocity, wider lateral spreading and larger initial dilution under the wave effect, indicating that wave dynamics improves the jet entrainment and mixing in the near field, and subsequently mitigate the jet impacts in the far field. The effect of buoyancy force on the jet behaviours in the random waves is also numerically investigated. The results show that the wave effect on the jet entrainment and mixing is considerably weakened under the existence of buoyancy force, resulting in a slower decay rate of centerline velocity and a narrower jet width for the jet with initial buoyancy.
Keywords:numerical study  large eddy simulation  buoyant jet  JONSWAP random waves
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