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Numerical investigation of flow structures around a cylindrical afterbody under supersonic condition

机译：超音速条件下圆柱后身周围流动结构的数值研究

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摘要

Large Eddy Simulation (LES) with dynamic Smagorinsky model has been applied to numerically investigate the complicated flow structures that evolve in the near wake of a cylindrical after body aligned with a uniform Mach 2.46 flow. Mean flow field properties obtained from numerical simulations, such as axial velocity, pressure on base surface, have been compared with the experimental measurements as well as with other published results. It has been found that standard k-epsilon model fails to predict the flow properties in the recirculation region where better agreement has been observed between the data obtained from LES and experimental measurements. Flow Statistics like turbulent kinetic energy and primary Reynolds' stress have also been calculated and compared with the results obtained from experiments in order to quantitatively assess the ability of LES technique to predict the turbulence properties of flow field in the highly compressible shear layer region. The data obtained from LES has been further analyzed to understand the evolution of coherent structures in the flow field. Proper Orthogonal Decomposition (POD) of the data obtained from central plane in the wake region has been performed in order to reveal the most energetic structures present in the flow field. (C) 2015 Elsevier Masson SAS. All rights reserved.
机译：具有动态Smagorinsky模型的大型涡模拟（LES）已被用于数值研究复杂的流动结构，该结构在将主体与均匀的2.46马赫流对齐后在圆柱体的近尾处演化。从数值模拟获得的平均流场特性，例如轴向速度，基面上的压力，已与实验测量以及其他已发表的结果进行了比较。已经发现，标准的k-ε模型不能预测在从LES获得的数据和实验测量值之间观察到更好的一致性的再循环区域中的流动特性。还计算了湍流动能和主要雷诺应力等流动统计数据，并将其与实验结果进行了比较，以便定量评估LES技术预测高度可压缩剪切层区域内流场湍流特性的能力。进一步分析了从LES获得的数据，以了解流场中相干结构的演变。从尾流中心平面获得的数据进行了适当的正交分解（POD），以揭示流场中存在的最有能量的结构。 （C）2015 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2015年第12期|195-209|共15页
  • 作者

    Das Pratik; De Ashoke;

  • 作者单位

    Indian Inst Technol, Dept Aerosp Engn, Kanpur 208016, Uttar Pradesh, India;

    Indian Inst Technol, Dept Aerosp Engn, Kanpur 208016, Uttar Pradesh, India;

  • 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

    LES; Supersonic base flow; POD;

    机译：LES;超音速基流;POD;

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