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

  • 제26권4호
  • /
  • Pages.515-523
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  • 2002
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  • 1226-4881(pISSN)
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  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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주기적으로 회전하는 원형실린더 주위의 유동특성

Characteristics of Flow Over a Rotationally Oscillating Cylinder

  • 최해천 (서울대학교 기계항공공학부) ;
  • 최성호 (서울대학교 대학원) ;
  • 강상모 (대구대학교 자동차산업기계공학부)
  • Choe, Hae-Cheon (Dept.of Mechanical Aerospace Engineering, Seoul National University) ;
  • Choe, Seong-Ho (Graduate School of Seoul National University) ;
  • Gang, Sang-Mo (Dept.of Automotive Industry Mechanical Engineering, Daegu University)
  • 발행 : 2002.04.01
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초록

Effects of rotary oscillation on unsteady laminar flow past a circular cylinder have been investigated in this study. Numerical simulations are performed for the flow at Re=100 in the range of 0.2<$\Omega$<2.5 and 0.02<$St_f$<0.8, where $\Omega$ and $St_f$ are, respectively, the maximum rotation velocity and rotation frequency normalized by the free-stream velocity and cylinder diameter. Results show that rotary oscillation has significant effects on the flow. When the rotation frequency is near the natural vortex-shedding frequency, lock-on occurs and the lock-on frequency range becomes wider as the rotation velocity increases. In a certain range of the rotation frequency and velocity, modulations in the velocity, lift and drag signals occur and this modulation frequency is expressed as a linear combination of the rotation frequency and vortex-shedding frequency. The mean drag and amplitude of the lift fluctuations show local minima near the boundary between the lock-on non and lock-on regions.

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참고문헌

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