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With increase in computational power using modern computers, advanced numerical techniques like Large Eddy Simulation (LES) have emerged as useful tools for solving industrial problems to get more accurate solutions and for flow visualization for getting better scientific insights. In this paper, Embedded Large Eddy Simulation (ELES) technique was applied to a miniature jet pump to predict the mixing behaviour in the mixing chamber and diffuser using LES. Other parts of the jet pump were modelled through conventional Reynolds Average Navier–Stokes with standard k–ε turbulent model (RANS-SKE). Comparison of this detailed simulation results with that using RANS-SKE in the whole computational domain was done. It was observed that both the techniques could predict overall performance in terms of jet pump efficiency well in agreement with experimental results. However, considerable differences were observed with respect to jet behaviour, length of the developing region, etc. Moreover, the miniature size of the jet pump considerably affected the flow regimes formed inside the mixing chamber. Turbulent coherent structures were well visualized in the mixing region by simulation using LES.

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Numerical Simulation of High-Velocity Mixing Inside a Miniature Jet Pump

  • 会议论文

  • 发表日期：

    2026年

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  • Vimal Kotak,
  • Samiran Sengupta,
  • Sugilal Gopalakrishnan,
  • Sujay Bhattacharya

摘要

With increase in computational power using modern computers, advanced numerical techniques like Large Eddy Simulation (LES) have emerged as useful tools for solving industrial problems to get more accurate solutions and for flow visualization for getting better scientific insights. In this paper, Embedded Large Eddy Simulation (ELES) technique was applied to a miniature jet pump to predict the mixing behaviour in the mixing chamber and diffuser using LES. Other parts of the jet pump were modelled through conventional Reynolds Average Navier–Stokes with standard k–ε turbulent model (RANS-SKE). Comparison of this detailed simulation results with that using RANS-SKE in the whole computational domain was done. It was observed that both the techniques could predict overall performance in terms of jet pump efficiency well in agreement with experimental results. However, considerable differences were observed with respect to jet behaviour, length of the developing region, etc. Moreover, the miniature size of the jet pump considerably affected the flow regimes formed inside the mixing chamber. Turbulent coherent structures were well visualized in the mixing region by simulation using LES.