한국해양공학회지 (Journal of Ocean Engineering and Technology)

  • 제37권4호
  • /
  • Pages.137-144
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  • 2023
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  • 1225-0767(pISSN)
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  • 2287-6715(eISSN)
한국해양공학회 (Korean Society of Ocean Engineers)
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Visualization of Turbulent Flow Fields Around a Circular Cylinder at Reynolds Number 1.4×105 Using PIV

  • Jun-Hee Lee (Student, Department of Naval Architecture & Ocean Engineering, Inha University) ;
  • Bu-Geun Paik (Korea Research Institute of Ships & Ocean Engineering) ;
  • Seok-Kyu Cho (Korea Research Institute of Ships & Ocean Engineering) ;
  • Jae-Hwan Jung (Korea Research Institute of Ships & Ocean Engineering)
  • 투고 : 2023.04.17
  • 심사 : 2023.07.19
  • 발행 : 2023.08.31
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초록

This study investigates the experimental parameters of particle image velocimetry (PIV) to enhance the measurement technique for turbulent flow fields around a circular cylinder at a Reynolds number (Re) of 1.4×105. At the Korea Research Institute of Ships & Ocean Engineering (KRISO), we utilized the cavitation tunnel and PIV system to capture the instantaneous flow fields and statistically obtained the mean flow fields. An aspect ratio and blockage ratio of 16.7% and 6.0%, respectively, were considered to minimize the tunnel wall effect on the cylinder wakes. The optimal values of the pulse time and the number of flow fields were determined by comparing the contours of mean streamlines, velocities, Reynolds shear stresses, and turbulent kinetic energy under their different values to ensure accurate and converged results. Based on the findings, we recommend a pulse time of 45 ㎲ corresponding to a particle moving time of 3-4 pixels, and at least 3,000 instantaneous flow fields to accurately obtain the mean flow fields. The results of the present study agree well with those of previous studies that examined the end of the subcritical flow regime.

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과제정보

This work was supported by the Korea Research Institute of Ships & Ocean Engineering Project ("Development of CFD Technology for Global Performance Analysis of Offshore Structure") funded by the Ministry of Oceans and Fisheries (PES4780).

참고문헌

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