Journal of Advanced Marine Engineering and Technology

The Korean Society of Marine Engineering (한국마린엔지니어링학회)
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Turbulence Characteristics in a Circular Open Channel by PIV Measurements

  • Kim, Sun-Gu (Graduate Student, Dept of Mechanical Engineering, Seoul Tech) ;
  • Sung, Jae-Yong (Dept of Mechanical Engineering, Seoul Tech) ;
  • Lee, Myeong-Ho (Dept of Mechanical Engineering, Seoul Tech)
  • Received : 2011.11.15
  • Accepted : 2011.11.24
  • Published : 2011.11.30
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Abstract

The characteristics of mean velocity and turbulence have been analyzed in the circular open channel flow using PIV measurement data for a wide range of water depth. The measured data are fitted to a velocity distribution function over the whole depth of the open channel. Reynolds shear stress and mean velocity in wall unit are compared with the analytic models for fully-developed turbulent boundary layer. Both the mean velocity and Reynolds shear stress have different distributions from the two-dimensional boundary layer flow when the water depth increases over 50% since the influence of the side wall penetrates more deeply into the free surface. The cross-stream Reynolds normal stress also has considerably different distribution in view of its peak value and decreasing rate in the outer region whether the water depth is higher than 50% or not.

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References

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