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

The Korean Society of Mechanical Engineers (대한기계학회)
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Direct Numerical Simulation of the Lock-on Phenomena in the Wake behind a Circular Cylinder in a Perturbed Flow at Re=360

Re=360에서 교란유동장에 놓인 원형실린더 후류의 유동공진 현상에 대한 직접수치해석

  • 박지용 (서울대학교 대학원 기계항공공학부 (한라공조 주식회사)) ;
  • 김수현 (서울대학교 대학원 기계항공공학부) ;
  • 배중헌 (서울대학교 대학원 기계항공공학부) ;
  • 박노마 (서울대학교 대학원 기계항공공학부) ;
  • 유정열 (서울대학교 기계항공공학부, 서울대학교 정밀기계설계공동연구소)
  • Published : 2007.09.01
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Abstract

Lock-on phenomenon in the wake of a circular cylinder is investigated at the Reynolds number of 360 using direct numerical simulation (DNS). To induce lock-on, a streamwise velocity perturbation with a frequency of twice the natural shedding frequency is superimposed on the free stream velocity. The Reynolds stress distributions are investigated to analyze the streamwise force balance acting on the recirculation region and the results are compared with the previous experimental result. When the lock-on occurs, the pressure force on the recirculation region is shown to increase mainly due to the reversal of the Reynolds shear stress distribution, which is consistent with our previous results using PIV measurement. It is also shown that, with the lock-on, the strength of the primary vortices increases whereas that of the secondary vortices decreases significantly. Further, under the lock-on condition the wavelength of the secondary vortices increases by as much as 2.5 times.

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References

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