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首页> 外文期刊>Applied Mathematical Modelling >Assessment of an improved turbulence model in simulating the unsteady flows around a D-shaped cylinder and an open cavity
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Assessment of an improved turbulence model in simulating the unsteady flows around a D-shaped cylinder and an open cavity

机译：在模拟D形圆筒周围的不稳定流和开放式空腔中的改进湍流模型的评估

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摘要

Most engineering flows are still predicted by the conventional Reynolds-averaged Navier-Stokes method because of the low requirements of the computational quantities. However, the resolution capability of Reynolds-averaged Navier-Stokes models is still open to deliberation, especially in the recirculation and wake regions, where the vortical flows dominate. In the present work, an improved turbulence model derived from the original shear stress transport k-ω model is proposed and its superiority is assessed by our modeling the unsteady flows around a D-shaped cylinder and an open cavity, corresponding to two different Reynolds numbers. The results are compared with results from experiments and other turbulence models in terms of the flow morphology and mean velocity profiles. This shows that the predictive accuracy of the modified turbulence model is increased significantly in the bluff body wake flows and in the shear layer and separation flows of the cavity. Some special vortex structures can be captured in the open cavity, in which the secondary vortex emerging from the shear layer and the separation vortex near the trailing edge can induce large flow instability, and this phenomenon should be eliminated in engineering applications. It is believed that this improved turbulence model can be used for the more complex turbomachinery flows with better prediction of the hy-drodynamic/aerodynamic performance and the unsteady vortical flows, which can provide some guidelines to design or optimize rotating machines.
机译：由于计算量的要求低，传统的雷诺平均Navier-Stokes方法仍然预测大多数工程流量。然而，Reynolds-Iveriged Navier-Stokes模型的分辨率仍然可以审议，尤其是在循环流动占据主导地位的再循环和唤醒区域中。在本作本作中，提出了一种改进的湍流模型，其源自原始剪切应力传输K-ω模型，并且通过我们的建模，对应于D形气缸和开口腔的模型，对应于两个不同的雷诺数来评估其优越性。将结果与实验和其他湍流模型的结果与流动形貌和平均速度剖面进行了比较。这表明修饰的湍流模型的预测精度在凹槽体唤醒流动和剪切层中的剪切层和腔的分离流动中显着增加。一些特殊的涡旋结构可以在开口腔中捕获，其中从剪切层出来的次级涡流和后缘附近的分离涡流可以引起大的流量不稳定，并且在工程应用中应该消除这种现象。据信，这种改进的湍流模型可用于更复杂的涡轮机流动流，具有更好地预测Hy-Drody动力/空气动力学性能和不稳定的涡流流动，这可以提供一些设计或优化旋转机器的指导方针。

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  • 来源
    《Applied Mathematical Modelling》 |2020年第7期|552-575|共24页
  • 作者

    Lei Shi; Yefang Wang; Guangjian Zhang; Yongxin Jin; Desheng Zhang;

  • 作者单位

    Research Center of Fluid Machinery Engineering and Technology Jiangsu University 301 Xuefu Road Zhenjiang 212013 China;

    Research Center of Fluid Machinery Engineering and Technology Jiangsu University 301 Xuefu Road Zhenjiang 212013 China;

    Research Center of Fluid Machinery Engineering and Technology Jiangsu University 301 Xuefu Road Zhenjiang 212013 China;

    Research Center of Fluid Machinery Engineering and Technology Jiangsu University 301 Xuefu Road Zhenjiang 212013 China;

    Research Center of Fluid Machinery Engineering and Technology Jiangsu University 301 Xuefu Road Zhenjiang 212013 China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Turbulence modeling; D-shaped cylinder; Open cavity; Wake flow; Separation flow;

    机译：湍流建模;D形气缸;开腔;唤醒流动;分离流量;

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