Journal of the Korean Society of Visualization (한국가시화정보학회지)

The Korean Society of Visualization (한국가시화정보학회)
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Spanwise growth of coherent structures in turbulent pipe flow

난류 파이프 유동 내 응집 구조의 횡 방향 성장

  • Ahn, Junsun (Department of Railway Vehicle System Engineering, Korea National University of Transportation) ;
  • Lee, Jinyoung (Department of Mechanical and Aerospace Engineering, Princeton University) ;
  • Hwang, Jinyul (School of Mechanical Engineering, Pusan National University)
  • Received : 2021.06.24
  • Accepted : 2021.07.18
  • Published : 2021.08.31
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Abstract

The spanwise growth of turbulence structures in turbulent pipe flow was investigated using the direct numerical simulation data of Re𝜏 = 544, 934 and 3008. Two-point correlations and pre-multiplied energy spectra of streamwise velocity fluctuations were examined along the spanwise direction. The arclength direction is defined as r𝛳, which is useful for an analogy with the spanwise direction for channels or boundary layers; here, r and 𝛳 are the radial distance from the core and the azimuthal angles, respectively. Both analyses showed that the arclength scales increased with increasing the wall-normal distance. It showed that the coherent structures were confined in the core region due to the crowding effect of a circular pipe geometry. The pipe flow simulation could describe a realistic geometrical flow along the azimuthal direction, unlike the simulations of turbulent channel or boundary layer flow using periodic boundary conditions along the spanwise direction. The present results provided the spanwise organization of energy-containing motions over a broad range of scales in turbulent pipe flow.

Keywords

Acknowledgement

이 연구는 2019학년도 부산대학교 신임교수정착금 지원으로 이루어졌음.

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