Numerical simulation of surface roughness effects on the vortex-induced vibration of a circular cylinder at a subcritical Reynolds number
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The Vortex-Induced Vibration (VIV) of a circular cylinder with different surface roughness is numerically simulated at a subcritical Reynolds number of 3900. The effects of surface roughness on the vibration response amplitude, hydrodynamic coefficients and wake vortex are analyzed. The results show that as surface roughness increases, four branches (initial, upper, super-upper and lower branches) appear in the VIV response for a smooth cylinder, and for a cylinder with a small surface roughness of KS=D ¼ 2:5 103 , this response changes to three branches (initial, upper and lower branches). The vortex shedding for the initial and lower branches is 2S mode, and that for the upper and super-upper branches (lock-in range) is P þ S, PþSþ and 2P modes. With increasing surface roughness, the maximum amplitude has little difference, and the width of the lock-in range increases. A large jump in the vortex phase at the transition of the initial and upper branches and a large jump in the total lift phase at the transition of the upper and lower branches are found, and these jumps are associated with a switch in the timing of vortex shedding (jump of the vortex phase: 2S mode to P þ S mode; jump of the lift phase: other modes to 2S mode). The results are significant for the development of flow and vibration control technology.
Abstract
The Vortex-Induced Vibration (VIV) of a circular cylinder with different surface roughness is numerically simulated at a subcritical Reynolds number of 3900. The effects of surface roughness on the vibration response amplitude, hydrodynamic coefficients and wake vortex are analyzed. The results show that as surface roughness increases, four branches (initial, upper, super-upper and lower branches) appear in the VIV response for a smooth cylinder, and for a cylinder with a small surface roughness of KS=D ¼ 2:5 103 , this response changes to three branches (initial, upper and lower branches). The vortex shedding for the initial and lower branches is 2S mode, and that for the upper and super-upper branches (lock-in range) is P þ S, PþSþ and 2P modes. With increasing surface roughness, the maximum amplitude has little difference, and the width of the lock-in range increases. A large jump in the vortex phase at the transition of the initial and upper branches and a large jump in the total lift phase at the transition of the upper and lower branches are found, and these jumps are associated with a switch in the timing of vortex shedding (jump of the vortex phase: 2S mode to P þ S mode; jump of the lift phase: other modes to 2S mode). The results are significant for the development of flow and vibration control technology.
참고문헌 (29)
- Achenbach, E., "Influence of surface roughness on the cross-flow around a circular cylinder", J. Fluid Mech, 46, pp.321~335 (1971)
- Achenbach, E., "On vortex shedding from smooth and rough cylinders in the range of Reynolds numbers", J. Fluid Mech, 19 (2006)
- Allen, D. W., "Surface roughness effects on vortex-induced vibration of cylindrical structures at critical and supercritical Reynolds numbers", Days, All. Offshore Technology Conference (2001)
- H., S., J., K., L., S.R, "Boundary-layer theory", J. Fluid Eng, pp.102~ (1980)
- N, N. J. J., "The effect of two degrees of freedom on vortex-induced vibration at low mass and damping", J. Fluid Mech, 509, pp.23~62 (2004)
- Bearman, P. W., "Control of circular cylinder flow by the use of dimples", AIAA J, 31(10), pp.1753~1756 (1993)
- Franzini, R. G., "Experimental investigation into the flow around a stationary and yawed cylinder under asymmetrical end conditions", Int. J. Offshore Polar Eng, 24, pp.02~ (2014)
- Fujarra, A. L. C., "Vortex-induced vibration of A flexible cantilever", J. Fluid Struct, 15, pp.3~4 (2001)
- Gao, Y., "Effect of surface roughness on vortexinduced vibration response of a circular cylinder", Ships Offshore Struct, 13(1) (2018)[DOI]
- Gao, Y., "Numerical simulation of vortexinduced vibration of a circular cylinder with different surface roughnesses", Mar. Struct, pp.57~ (2018)
- Govardhan, R., "Modes of vortex formation and frequency response of a freely vibrating cylinder", J. Fluid Mech, 420, pp.85~130 (2000)
- Govardhan, R., "Critical mass in vortex-induced vibration of a cylinder", Eur. J. Mech. B Fluid, 23(1) (2003)
- Guido, B., "The effect of surface roughness on the flow regime around circular cylinders", Elsevier, 8(1-2) (1981)
- Huang, Z. Y., "Numerical simulation of VIV of a circular cylinder with two degrees of freedom and low mass-ratio", J. Ship Mech, 11, pp.1~9 (2007)[DOI]
- Jauvtis, N., "Vortex-induced vibration of a cylinder with two degrees of freedom", J. Fluid Struct, 17(7) (2003)
- Khalak, A., "Dynamics of a hydroelastic cylinder with very low mass and damping", J. Fluid Struct, 10(5), pp.455~472 (1996)
- Kiu, K. Y., "Effects of uniform surface roughness on vortex-induced vibration of towed vertical cylinders", J. Sound Vib, 330(20) (2011)
- Mallick, M., "Flow modeling in various cylindrical surfaces", Aquatic Procedia, 4 (2015)
- Morse, T. L., "The effect of end conditions on the vortex-induced vibration of cylinders", J. Fluid Struct, 24(8) (2008)
- Nakamura, Y., "The effects of surface roughness on the flow past circular cylinders at high Reynolds numbers", J. Fluid Mech (1982)
- Okajima, A., "Some experiments on flow-induced vibration of A circular cylinder with surface roughness", J. Fluid Struct, 13(7-8) (1999)[DOI]
- Park, H., "Enhancement of flow-induced motion of rigid circular cylinder on springs by localized surface roughness at 3×10 4≤Re≤1.2×10 5", Ocean Eng, pp.72~ (2013)
- Park, H., "Suppression of vortex-induced vibrations of rigid circular cylinder on springs by localized surface roughness at 3×10 4≤Re≤1.2×10 5", Ocean Eng, pp.111~ (2016)
- Saltara, F., "Numerical simulation of flow around elastically mounted cylinder", Int. J. Offshore Polar Eng, 13(2) (2003)
- Sarpkaya, T., "A critical review of the intrinsic nature of vortex-induced vibrations", J. Fluid Struct, 19(4) (2004)
- Van Hinsberg, N. P., "The Reynolds number dependency of the steady and unsteady loading on a slightly rough circular cylinder: from subcritical up to high transcritical flow state", J. Fluid Struct, pp.55~ (2015)
- Williamson, C. H. K., "A high-amplitude 2T mode of vortex-induced vibration for a light body in XY motion", Eur. J. Mech. B Fluid, 23(1) (2003)
- Zhao, M., "Vortex-induced vibration (VIV) of a circular cylinder in combined steady and oscillatory flow", Ocean Eng, pp.73~ (2013)
- Zhou, B., "Experimental study on flow past a circular cylinder with rough surface", Ocean Eng, pp.109~ (2015)