Abstract Large eddy simulations of subsonic round jets are carried out using high order compact finite difference scheme and an explicit filtering based approximate deconvolution method. The jets have a Mach number of 0.9 and Reynolds number of 4.5 × 10 5 based on jet diameter and centerline velocity at inflow. Results obtained for the mean flow and turbulence intensities agree well with those in existing literature. We also study the effects of co-flow velocity ratio on the flow physics. Increase in potential core length and decrease in spreading rate of jet is observed in the presence of co-flow. The effects of co-flow velocity ratio on the axial Reynolds stress and turbulent kinetic energy budgets are also presented. It is observed that increasing co-flow velocity ratio leads to reduction in the turbulence intensities and near-field sound levels.

中文翻译：

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具有coflow的可压缩圆形射流的大涡模拟

摘要 使用高阶紧致有限差分格式和基于显式滤波的近似解卷积方法对亚音速圆形射流进行了大涡模拟。基于射流直径和流入时的中心线速度，射流的马赫数为 0.9，雷诺数为 4.5 × 10 5。获得的平均流动和湍流强度的结果与现有文献中的结果非常吻合。我们还研究了协流速度比对流动物理的影响。在共流存在的情况下观察到潜在核心长度的增加和射流扩散速率的降低。还介绍了协流速度比对轴向雷诺应力和湍流动能预算的影响。