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Effect of turbulence modelling on 3-D LES of transitional flow behind a circular cylinder

机译:湍流建模对圆柱后过渡流的3-D LES的影响

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摘要

Results of a numerical evaluation of transitional flow behind a circular cylinder are presented. Three-dimensional calculations are performed in a frame of large eddy simulation at a Reynolds number of 41,300 based on the free stream velocity and cylinder diameter for which previous experimental data is available for comparison. The flow in the transitional regime is characterized by the presence of multiple flow scales such as small-scale shear-layer vortices in freely separating boundary layers and large-scale vortex motion in the wake. Three different subgrid scales, namely the Smagorinsky, k-equation and dynamic k-equation models, are applied in order to evaluate such a challenging flow field at the higher Reynolds number. The effects of the subgrid scale modelling on the main wake parameters and mean flow statistics are discussed in detail and compared to the available experimental measurements for the challenging flow regime. (C) 2015 Elsevier Ltd. All rights reserved.
机译:给出了圆柱体后面的过渡流的数值评估结果。在自由涡流速度和汽缸直径的基础上,可利用以前的实验数据进行比较,在雷诺数为41,300的大型涡流模拟框架中执行三维计算。过渡状态下的流动的特征是存在多个流动尺度,例如自由分离边界层的小尺度剪切层涡旋和尾流中的大尺度涡旋运动。应用了三种不同的子网格比例,即Smagorinsky模型,k方程和动态k方程模型,以便在较高的雷诺数下评估这种具有挑战性的流场。详细讨论了亚网格规模模型对主要尾流参数和平均流量统计的影响,并将其与具有挑战性的流量状态的可用实验测量结果进行了比较。 (C)2015 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Ocean Engineering》 |2015年第15期|19-25|共7页
  • 作者单位

    Univ Southampton, Fac Engn & Environm, Fluid Struct Interact Res Grp, Southampton SO17 1BJ, Hants, England;

    Univ Southampton, Fac Engn & Environm, Fluid Struct Interact Res Grp, Southampton SO17 1BJ, Hants, England;

    Univ Southampton, Fac Engn & Environm, Fluid Struct Interact Res Grp, Southampton SO17 1BJ, Hants, England;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    LES; Turbulence modelling; Circular cylinder; Near-wake flow;

    机译:LES;湍流建模;圆柱;近尾流;

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