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This study deals with turbulence-resolving simulations of a coaxial jet configuration from the CoJeN project using a novel hybrid RANS-LES methodology. Particular attention is paid to the accuracy of the hybrid simulations. Therefore, a Reynolds-stress background model (RSM) is employed in connection with the Improved Delayed Detached Eddy Simulation (IDDES) method. Additionally, in order to achieve the highest possible consistency with experimental data, the turbulent intensity within the engine is carefully adjusted. The study provides a detailed quantitative comparison of velocity as well as Reynolds-stress profiles of RANS, IDDES and experimental data. Finally, the study confirms that the new RSM-IDDES is suitable for accurately simulating jet flows.

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Turbulence-Resolving Simulations of a Coaxial Jet Based on Reynolds-Stress Modelling

  • 会议论文

  • 发表日期：

    2026年

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  • Marius Herr,
  • Axel Probst

摘要

This study deals with turbulence-resolving simulations of a coaxial jet configuration from the CoJeN project using a novel hybrid RANS-LES methodology. Particular attention is paid to the accuracy of the hybrid simulations. Therefore, a Reynolds-stress background model (RSM) is employed in connection with the Improved Delayed Detached Eddy Simulation (IDDES) method. Additionally, in order to achieve the highest possible consistency with experimental data, the turbulent intensity within the engine is carefully adjusted. The study provides a detailed quantitative comparison of velocity as well as Reynolds-stress profiles of RANS, IDDES and experimental data. Finally, the study confirms that the new RSM-IDDES is suitable for accurately simulating jet flows.