Vortex-Synchronization Control around a Partially Submerged Cylinder due to Wave-Following Current
Publication: Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143, Issue 6
Abstract
The results of an experimental study on combined wave and current flow around a partially submerged cylinder with a large Reynolds number ( = 5.96 × 104) are reported. The measured instantaneous velocity time-series data were analyzed to acquire insight into the first-, second-, third-, and fourth-order statistical moments. It was observed that turbulence generated because of the surface wave plays a significant role in the occurrence of vortex lock-on, which in turn alters the excitation frequency. For the vortex lock-on case in which the shedding frequency is the same as the natural shedding frequency, the recirculation zone is significantly reduced. However, for higher wave frequencies, the shedding frequency was modulated and the recirculation was somewhat enlarged. The comparative study between only current flow (OCF) and combined wave-current flow (WCF) showed that the intermittency in turbulence was larger for the OCF case (without a cylinder) than for the WCF case. The surface-wave-generated vortices induced around the cylinder interacted with the vorticity shear layers at the side of the cylinder and at the wake region, resulting in the formation of new induced wake vortices. These induced wake vortices controlled the recirculation region behind the cylinder.
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Acknowledgments
The authors acknowledge the Department of Science and Technology, Government of India, for the financial support for this research (File EMR/2015/MERC/000266.). Discussions with Professor B. S. Mazumder are gratefully acknowledged.
References
Andreopoulos, J., Durst, F., Zaric, Z., and Jovanovic, J. (1984). “Influence of Reynolds number on characteristics of turbulent wall boundary layers.” Exp. Fluids, 2(1), 7–16.
Barman, K., Debnath, K., and Mazumder, B. S. (2016). “Turbulence between two inline hemispherical obstacles under wave-current interactions.” Adv. Water Resour., 88(Feb), 32–52.
Bourguet, R., Karniadakis, G. E., and Triantafyllou, M. S. (2011). “Lock-in of the vortex-induced vibrations of a long tensioned beam in shear flow.” J. Fluids Struct., 27(5-6), 838–847.
Czernuszenko, W., and Rowiński, P. M. (2008). “Shear stress statistics in a compound channel flow.” Arch. Hydro-Eng. Env. Mech., 55(1–2), 3–27.
Debnath, K., Manik, M. K., and Mazumder, B. S. (2012). “Turbulence statistic of flow over scoured cohesive sediment bed around circular cylinder.” Adv. Water Resour., 41(Jun), 18–28.
Feng, L. H., and Wang, J. J. (2010). “Circular cylinder vortex-synchronization control with a synthetic jet positioned at the rear stagnation point.” J. Fluid Mech., 662, 232–259.
Feng, L. H., and Wang, J. J. (2014). “Modification of a circular cylinder wake with synthetic jet: Vortex shedding modes and mechanism.” Eur. J. Mech. B. Fluids, 43, 14–32.
Goring, D. G., and Nikora, V. I. (2002). “Despiking acoustic Doppler velocimeter data.” J. Hydraul. Eng., 117–126.
Griffin, O. M., and Hall, M. S. (1991). “Review—Vortex shedding lock-on and flow control in bluff body wakes.” J. Fluids Eng., 113(4), 526–537.
Griffin, O. M., and Ramberg, S. E. (1976). “Vortex shedding from a cylinder vibrating in line with an incident uniform flow.” J. Fluid Mech., 75(2), 257–271.
Kim, S. H., Park, J. Y., Park, N., Bae, J. H., and Yoo, J. Y. (2009). “Direct numerical simulation of vortex synchronization due to small perturbations.” J. Fluid Mech., 634(Sep), 61–90.
Kim, W., Yoo, J. Y., and Sung, J. (2006). “Dynamics of vortex lock-on in a perturbed cylinder wake.” Phys. Fluids, 18(7), 074103.
Lin, C., Chiu, P. H., and Shieh, S. J. (2002). “Characteristics of horseshoe vortex system near a vertical plate–base plate juncture.” Exp. Therm. Fluid Sci., 27(1), 25–46.
Lin, C., Lai, W. J., and Chang, K. A. (2003). “Simultaneous particle image velocimetry and laser Doppler velocimetry measurements of periodical oscillatory horseshoe vortex system near square cylinder-base plate juncture.” J. Eng. Mech., 1173–1188.
Mansard, E. P. D., Sand, S. E., and Klinting, P. (1988). “Sub and superharmonics in natural waves.” J. Offshore Mech. Arct. Eng., 110(3), 210–217.
MATLAB [Computer software]. Natick, MA, MathWorks.
Mazumder, B. S., Pal, D. K., Ghoshal, K., and Ojha, S. P. (2009). “Turbulence statistics of flow over isolated scalene and isosceles triangular-shaped bed forms.” J. Hydraul. Res., 47(5), 626–637.
Nezu, I., and Nakagawa, I. (1993). Turbulence in open-channel flows, CRC, Boca Raton, FL.
Nezu, I., and Rodi, W. (1986). “Open-channel measurement with a laser Doppler anemometer.” J. Hydraul. Eng., 335–355.
Nikora, V. I., Goring, D. G., and Biggs, B. J. F. (2002). “Some observations of the effects of micro-organisms growing on the bed of an open channel on the turbulence properties.” J. Fluid Mech., 450(Jan), 317–341.
Ojha, S. P., and Mazumder, B. S. (2010). “Turbulence characteristics of flow over a series of 2-D bed forms in the presence of surface waves.” J. Geophys. Res., 115(Dec), F04016.
Rinne, H. (2010). Location-scale distributions—Linear estimation and probability plotting using MATLAB, Justus–Liebig–Univ., Dept. of Economics and Management Science, Giessen, Germany.
Singh, S. K., Debnath, K., and Mazumder, B. S. (2015). “Turbulence statistics of wave-current flow over a submerged cube.” J. Waterway, Port, Coastal, Ocean Eng.,.
Tennekes, H., and Lumley, J. L. (1972). A first course in turbulence, MIT Press, Cambridge, MA.
Venditti, J. G., and Bennett, S. J. (2000). “Spectral analysis of turbulent flow and suspended sediment transport over fixed dunes.” J. Geophys. Res., 105(C9), 22035–22047.
Win-ADV, Ver. 2.00.0024 [Computer software]. San Diego, CA, SonTek.
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Published In
Journal of Waterway, Port, Coastal, and Ocean Engineering
Volume 143 • Issue 6 • November 2017
Copyright
© 2017 American Society of Civil Engineers.
History
Received: Oct 20, 2016
Accepted: Apr 18, 2017
Published online: Jul 17, 2017
Published in print: Nov 1, 2017
Discussion open until: Dec 17, 2017
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