• 제목/요약/키워드: 2차원 정방형 각주

검색결과 2건 처리시간 0.016초

2차원 각주의 공력특성 능동제어에 관한 수치해석 연구 (Numerical Study on the Active Control of Aerodynamic Properties of 2 - D Square Prism)

  • 이영호;김춘식;조대환
    • Journal of Advanced Marine Engineering and Technology
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    • 제17권1호
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    • pp.33-44
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    • 1993
  • Active control of a flow field is essential to design efficient parts or elements relating to fluid machineries. The present study is aimed to suggest a new discretization technique of the convection term by renewing the non-conservative equation found in SOLA-VOF into a conservative one. And, as an application, flow characteristics are investigated by adjusting the backward ejecting velocity of 2-D square prism to control the aerodynamic properties. Strouhal number, drag and lift coefficient are compared in terms of various ejecting velocity. Among the results, the transient weak fluctuation of the lift and drag coefficient when the ejecting velocity equals channel inlet velocity is remarkably noticed.

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수직방향으로 정렬된 정사각주 후류에서의 3차원 불안정성 (TRANSITION IN THE FLOW PAST SIDE-BY-SIDE SQUARE CYLINDERS)

  • 최준범;장용준;윤동혁;양경수
    • 한국전산유체공학회지
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    • 제15권2호
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    • pp.62-70
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    • 2010
  • Secondary instability in the flow past two square cylinders in side-by-side arrangements is numerically studied by using a Floquet analysis. The distance between the neighboring faces of the two cylinders (G) is the key parameter which affects the secondary instability under consideration. In this paper, we present the critical Reynolds number for the secondary instability and the corresponding spanwise wave number of the most unstable (or least stable) wave for each G. Our results would shed light on a complete understanding of the onset of secondary instability in the presence of two side-by-side square cylinders.