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Helicity and geometric nature of particle trajectories in homogeneous isotropic turbulence

机译:均质各向同性湍流中粒子轨迹的螺旋度和几何性质

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摘要

The role of helicity in Lagrangian turbulence is investigated using direct numerical simulation of homogeneous isotropic turbulence. Probability density functions and autocorrelations along a fluid particle trajectory associated with geometric quantities such as curvature and torsion of the Lagrangian trajectory are provided. The relationship between helicity and the ratio of torsion to curvature is investigated. We found that probability density functions of torsion and torsion normalized by curvature clearly show well-established slope in log-log plots. Finally, the relationship between helicity, acceleration and geometric quantities are discussed.
机译:使用均质各向同性湍流的直接数值模拟研究了螺旋度在拉格朗日湍流中的作用。提供了沿着与诸如拉格朗日轨迹的曲率和扭转的几何量相关联的流体粒子轨迹的概率密度函数和自相关。研究了螺旋度与扭转曲率比之间的关系。我们发现,扭转的概率密度函数和通过曲率归一化的扭转在对数对数图中清楚显示出已建立的斜率。最后,讨论了螺旋度,加速度和几何量之间的关系。

著录项

  • 来源
    《International Journal of Heat and Fluid Flow》 |2010年第3期|P.482-487|共6页
  • 作者单位

    Division of Computational Sciences in Mathematics, National Institute for Mathematical Science, Daejeon 305-340, South Korea;

    rnSchool of Mechanical Engineering, Yonsei University, Seoul 120-749, South Korea;

    rnSchool of Mechanical Engineering, Yonsei University, Seoul 120-749, South Korea Department of Computational Science and Engineering, Yonsei University, Seoul 120-749, South Korea;

  • 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

    lagrangian helicity; acceleration; curvature; torsion; particle trajectory;

    机译:拉格朗日螺旋度加速曲率扭转粒子轨迹;

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