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

The Korean Society of Mechanical Engineers (대한기계학회)
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Study of Sloshing Flow in a Rectangular Tank

사각용기의 슬로싱 유동에 관한 연구

  • Ji, Young-Moo (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology) ;
  • Shin, Young-Seop (Dept. of Computer Aided Design, Halla Univ.) ;
  • Park, Jun-Sang (Dept. of Mechanical Engineering, Halla Univ.) ;
  • Hyun, Jae-Min (Dept. of Mechanical Engineering, Korea Advanced Institute of Science and Technology)
  • 지영무 (한국과학기술원 기계공학과) ;
  • 신영섭 (한라대학교 컴퓨터 응용 설계학과) ;
  • 박준상 (한라대학교 기계공학과) ;
  • 현재민 (한국과학기술원 기계공학과)
  • Received : 2010.12.20
  • Accepted : 2011.03.30
  • Published : 2011.06.01
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Abstract

The two-dimensional sloshing problem in a rigid rectangular tank with a free surface is considered. The flow is generated by a container in harmonic motion in time along the horizontal axis, i.e., a container excited by u=Asin($2{\pi}ft$) where u denotes the container velocity imposed externally, A is the amplitude of the oscillation velocity, and f is the frequency of oscillation. Experimental apparatus is arranged to investigate the large-amplitude sloshing flows in off-resonant conditions, where the large amplitude means that A~O(1), and the distance, S, is comparable to the breadth, L, of the container, i.e., L/S~O(1). Comprehensive particle image velocimetry (PIV) data are obtained, which show that the flow physics of the nonlinear off-resonant sloshing problem can be characterized into three peculiar free surface motions: standing-wave motions similar to those of linear sloshing, a run-up phenomenon along the vertical sidewall at the moment of turn-over of the container, and gradually propagating bore motion from the sidewall to the interior fluid region, like a hydraulic jump.

본 연구에서는 사각용기 내에서의 자유표면을 갖는 2차원 슬로싱 문제에 대하여 고찰하였다. 용기 내부의 유동은 수평방향의 조화운동을 통해 형성되며, 외부 가진 속도는 u=Asin($2{\pi}ft$)으로 정의 된다. 여기서 u, A�� 그리고 f는 외부로부터 작용하는 가진 속도, 변위 그리고 주파수를 각각 나타낸다. 큰 변위(A~O(1)) 슬로싱 문제의 해석을 위한 실험설비를 구축하였으며, 광범위한 영역에서의 PIV실험을 수행하였다. 실험을 통해 자유표면의 움직임(motion)을 각각 서로 다른 물리적 특성을 갖는 세 가지; 선형 슬로싱의 자유표면의 움직임과 유사한 standing wave motion, 사각용기의 속도가 0을 지나는 순간(the moment of turn-over) 측벽에서 발생하는 run-up motion 그리고 측벽으로부터 내부유체로 점차적으로 전파되는 bore motion으로 분류하였다.

Keywords

References

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