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

  • 제22권3호
  • /
  • Pages.267-279
  • /
  • 1998
  • /
  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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주기적으로 회전하는 원봉 주위의 후류에 관한 수치적 연구

Numerical simulation of the flow behind a circular cylinder with a rotary oscillation

  • 백승진 (한국과학기술원 기계공학과) ;
  • 성형진 (한국과학기술원 기계공학과)
  • Baek, Seung-Jin (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Seong, Hyeong-Jin (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
  • 발행 : 1998.03.01
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초록

A numerical study was made of flow behind a circular cylinder in a uniform flow, where the cylinder was rotationally oscillated in time. The temporal behavior of vortex formation was scrutinized over broad ranges of the two externally specified parameters, i.e., the dimensionless rotary oscillating frequency (.110.leq. $S_{f}$.leq..220) and the maximum angular amplitude of rotation (.theta.$_{max}$=15 deg., 30 deg. and 60 deg.). The Reynolds number (Re= $U_{{\inf}D}$.nu.) was fixed at Re=110. A fractional-step method was utilized to solve the Navier-Stokes equations with a generalized coordinate system. The main emphasis was placed on the initial vortex formations by varying $S_{f}$ and .theta.$_{max}$. Instantaneous streamlines and pressure distributions were displayed to show the vortex formation patterns. The vortex formation modes and relevant phase changes were characterized by measuring the lift coefficient ( $C_{L}$) and the time of negative maximum $C_{L}$( $t_{-C}$$_{Lmax}$) with variable forcing conditions.s.tions.s.s.s.

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참고문헌

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