Numerical study of a round buoyant jet under the effect of JONSWAP random waves

Yong ping Chen, Chi Wai Li, Chang kuan Zhang, Zhen shan Xu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

8 Citations (Scopus)


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.
Original languageEnglish
Pages (from-to)235-250
Number of pages16
JournalChina Ocean Engineering
Issue number2
Publication statusPublished - 1 Jun 2012


  • buoyant jet
  • JONSWAP random waves
  • large eddy simulation
  • numerical study

ASJC Scopus subject areas

  • Oceanography
  • Renewable Energy, Sustainability and the Environment
  • Ocean Engineering
  • Mechanical Engineering

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