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

  • 제32권6호
  • /
  • Pages.421-428
  • /
  • 2008
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  • 1226-4881(pISSN)
  • /
  • 2288-5324(eISSN)
대한기계학회 (The Korean Society of Mechanical Engineers)
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3차원 입자와법을 이용한 높은 스트롤수로 진동하는 구에 대한 유동장의 수치해석

Flow Characteristics Around the Oscillating Sphere at High Strouhal Number Using Three-Dimensional Vortex Element Method

  • 이상환 (한양대학교 기계공학과) ;
  • 박윤섭 (한양대학교 대학원 기계공학과) ;
  • 조영택 (한양대학교 대학원 기계공학과) ;
  • 안철오 (한양대학교 대학원 기계공학과) ;
  • 서인수 (한양대학교 대학원 기계공학과)
  • 발행 : 2008.06.01
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초록

In this paper, we investigated the flow of an incompressible viscous fluid past a sphere which is oscillated one-dimensionally over flow regimes including laminar flow at Reynolds number of 100, 200 and Strouhal number of up to 5000. In order to analyze flow and estimate critical Strouhal number, we introduce three-dimensional vortex element method. With this method, separation only appears in decreasing velocity region during the high Strouhal numbers. We find out that vorticity distribution around sphere is proportionl to the Strouhal number. And we can decide that low Strouhal number is below 100, high Strouhal number is above 500 from many results. Thus the critical Strouhal number(St) effected to the flow field is expected to be 100

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참고문헌

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