자유 수면이 벽 근처 원형 실린더 주위 유동에 미치는 영향

다국어 초록 (Multilingual Abstract)

The flow past a surface-piercing circular cylinder near a moving wall at Re=100 and Fr=0.6 has been investigated using direct numerical simulation. The gap distance between the cylinder and the wall is G/D=∞, 1.5, and 0.6, where G/D=∞represents the isolated cylinder without the wall. The periodic shedding of organized vortices from the cylinder is observed in the deep flow which is far from the free surface. However, the vortex shedding is attenuated beneath the free surface, showing the flow past the cylinder is almost steady. Suppression of vortical development causes the decreases in the temporal fluctuations of the drag and lift coefficients beneath the free surface. The decreases in the coefficient fluctuations for G/D=0.6 are more dominant than those for G/D=1.5. The transition of hydrodynamic forces beneath free surface depends on the gap distance between the cylinder and the moving wall.

참고문헌 (Reference)

1 김찬우, "벽 사이 간격이 원형 실린더 주위 유동의 비대칭성에 미치는 영향" 한국전산유체공학회 24 (24): 99-106, 2019

2 Lei, C., "Vortex shedding suppression for flow over a circular cylinder near a plane boundary" 27 : 1109-1127, 2000

3 Huang, W. X., "Vortex shedding from a circular cylinder near a moving wall" 23 : 1064-1076, 2007

4 Jiang, H., "Twoand three-dimensional instabilities in the wake of a circular cylinder near a moving wall" 812 : 435-462, 2017

5 Suh, J, "The effect of air-water interface on the vortex shedding from a vertical circular cylinder" 27 : 1-22, 2011

6 구본국, "Reynolds and froude number effect on the flow past an interface-piercing circular cylinder" 대한조선학회 6 (6): 529-561, 2014

7 Koo, B.G., "Numerical study of two-phase air-water interfacial flow: plunging wave breaking and vortex-interface interaction" Graduate College of the University of Iowa 2011

8 Yu, G., "Large eddy simulation of flow past free surface piercing circular cylinders" 130 : 10134.1-10134.9, 2008

9 Kawamura, T., "Large eddy simulation of a flow past free surface piercing circular cylinder" 124 : 91-101, 2002

10 Lang, A. W., "Experimental study of the wake behind a surface-piercing cylinder for a clean and contaminated free surface" 402 : 109-136, 2000

11 Taneda, S., "Experimental investigation of vortex streeets" 20 : 1714-1721, 1965

12 Inoue, M., "Experimental and numerical study of viscous flow field around an advancing vertical circular cylinder piercing a free-surface" 220 : 57-64, 1993

13 Samani, M., "Effect of a wall on the wake dynamics of an infinite square cylinder" 55 : 158-166, 2015

14 Chen, S., "CFD study of free surface effect on flow around a surface-piercing cylinder" 2020

15 Yoon, H. S., "A numerical study on the fluid flow and heat transfer around a circular cylinder near a moving wall" 50 : 3507-3520, 2007

16 Brackbill, J. U., "A continuum method for modeling surface tension" 100 : 335-354, 1992