Wind and Structures

  • 제30권5호
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  • Pages.465-474
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  • 2020
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  • 1226-6116(pISSN)
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  • 1598-6225(eISSN)
테크노프레스 (Techno-Press)
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DNS of vortex-induced vibrations of a yawed flexible cylinder near a plane boundary

  • Zhang, Zhimeng (State Key Laboratory of Hydraulic Engineering Simulation & Safety, Tianjin University) ;
  • Ji, Chunning (State Key Laboratory of Hydraulic Engineering Simulation & Safety, Tianjin University) ;
  • Alam, Md. Mahbub (Institute for Turbulence-Noise-Vibration Interaction and Control, Harbin Institute of Technology (Shenzhen)) ;
  • Xu, Dong (State Key Laboratory of Hydraulic Engineering Simulation & Safety, Tianjin University)
  • 투고 : 2019.11.04
  • 심사 : 2020.03.01
  • 발행 : 2020.05.25
⟨ 이전 논문 다음 논문 ⟩

초록

Vortex-induced vibrations of a yawed flexible cylinder near a plane boundary are numerically investigated at a Reynolds number Ren= 500 based on normal component of freestream velocity. Free to oscillate in the in-line and cross-flow directions, the cylinder with an aspect ratio of 25 is pinned-pinned at both ends at a fixed wall-cylinder gap ratio G/D = 0.8, where D is the cylinder diameter. The cylinder yaw angle (α) is varied from 0° to 60° with an increment of 15°. The main focus is given on the influence of α on structural vibrations, flow patterns, hydrodynamic forces, and IP (Independence Principle) validity. The vortex shedding pattern, contingent on α, is parallel at α=0°, negatively-yawed at α ≤ 15° and positively-yawed at α ≥ 30°. In the negatively- and positively-yawed vortex shedding patterns, the inclination direction of the spanwise vortex rows is in the opposite and same directions of α, respectively. Both in-line and cross-flow vibration amplitudes are symmetric to the midspan, regardless of α. The RMS lift coefficient CL,rms exhibits asymmetry along the span when α ≠ 0°, maximum CL,rms occurring on the lower and upper halves of the cylinder for negatively- and positively-yawed vortex shedding patterns, respectively. The IP is well followed in predicting the vibration amplitudes and drag forces for α ≤ 45° while invalid in predicting lift forces for α ≥ 30°. The vortex-shedding frequency and the vibration frequency are well predicted for α = 0° - 60° examined.

키워드

과제정보

This work was financially supported by the National Natural Science Foundation of China (Grants No. 51579175, 51779172 and 51979186), the Science Fund for Creative Research Groups of the National Natural Science Foundation of China (Grant No. 51621092). The National Key Research and Development Program of China (Grant No. 2017YFC1404200). The work was carried out at National Supercomputer Center in Tianjin, and the calculations were performed in Tianhe 3 prototype.

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