Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Lagrangian Investigation of Turbulent Channel Flow (II) - Analysis of Lagrangian Statistics -

난류채널유동의 라그란지안 해석 (II) - 라그란지안 통계분석 -

  • 최정일 (연세대학교 기계공학과, 청정기술연구단) ;
  • 이창훈 (연세대학교 기계공학과)
  • Published : 2003.07.01
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Abstract

The Lagrangian dispersion of fluid particles in inhomogeneous turbulence is investigated by a direct numerical simulation of turbulent channel flow. Four points Hermite interpolation in the homogeneous direction and Chebyshev polynomials in the inhomogeneous direction is adopted to simulate the fluid particle dispersion. An inhomogeneity of Lagrangian statistics in turbulent boundary layer is investigated by releasing many particles at several different wall-normal locations and tracking those particles. The fluid particle dispersions and Lagrangian structure functions of velocity are scaled by the Kolmogorov similarity. The auto-correlations of velocity and acceleration are shown at the different releasing locations. Effect of initial particle location on the dispersion is analyzed by the probability density function at the several downstreams and time instants.

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References

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