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

The Korean Society of Mechanical Engineers (대한기계학회)
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Flow instability in Flow Past O-grooved Circular Cylinder

홈이 있는 원형 실린더를 지나는 유동의 불안정성

  • 김재희 (인하대학교 기계공학과) ;
  • 양경수 (인하대학교 기계공학과)
  • Received : 2014.09.03
  • Accepted : 2015.01.12
  • Published : 2015.04.01
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Abstract

This study was devoted to elucidating the change in the flow characteristics of a laminar flow past a circular cylinder by modifying the cylinder shape with O-grooves. A numerical analysis was performed in a two-dimensional framework. The cylinder was represented using an immersed boundary method and marker particles on a Cartesian grid system. The number and locations of the O-grooves were the key parameters. An analysis of the flow pattern and flow-induced forces was performed at Re = 40 and 50. In addition, we calculated the critical Reynolds number depending on the number of O-grooves and their locations.

본 연구에서는 층류 점성유동에서 원형 실린더를 기준으로 홈을 이용한 실린더의 형상변화가 유동 특성에 미치는 영향 분석을 2차원 수치 해석으로 수행하였다. 사용한 좌표계는 직교 좌표계로서 가상경계법과 표시 입자 기법을 사용하여 실린더를 구현하였다. 홈의 개수와 위치를 변수로 Re=40, 50에서 계산하였으며, 홈의 수와 위치에 의한 유동 불안정성을 해석하여 임계 레이놀즈 수를 구하였다.

Keywords

References

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