In-line flow-induced vibrations of a rotating cylinder

Journal of Fluid Mechanics - Tập 781 - Trang 127-165 - 2015
Rémi Bourguet1, David Lo Jacono1
1Institut de mécanique des fluides de Toulouse

Tóm tắt

The flow-induced vibrations of an elastically mounted circular cylinder, free to oscillate in the direction parallel to the current and subjected to a forced rotation about its axis, are investigated by means of two- and three-dimensional numerical simulations, at a Reynolds number equal to 100 based on the cylinder diameter and inflow velocity. The cylinder is found to oscillate up to a rotation rate (ratio between the cylinder surface and inflow velocities) close to 2 (first vibration region), then the body and the flow are steady until a rotation rate close to 2.7 where a second vibration region begins. Each vibration region is characterized by a specific regime of response. In the first region, the vibration amplitude follows a bell-shaped evolution as a function of the reduced velocity (inverse of the oscillator natural frequency). The maximum vibration amplitudes, even though considerably augmented by the rotation relative to the non-rotating body case, remain lower than 0.1 cylinder diameters. Due to their trends as functions of the reduced velocity and to the fact that they develop under a condition of wake-body synchronization or lock-in, the responses of the rotating cylinder in this region are comparable to the vortex-induced vibrations previously described in the absence of rotation. The symmetry breaking due to the rotation is shown to directly impact the structure displacement and fluid force frequency contents. In the second region, the vibration amplitude tends to increase unboundedly with the reduced velocity. It may become very large, higher than 2.5 diameters in the parameter space under study. Such structural oscillations resemble the galloping responses reported for non-axisymmetric bodies. They are accompanied by a dramatic amplification of the fluid forces compared to the non-vibrating cylinder case. It is shown that body oscillation and flow unsteadiness remain synchronized and that a variety of wake topologies may be encountered in this vibration region. The low-frequency, large-amplitude responses are associated with novel asymmetric multi-vortex patterns, combining a pair and a triplet or a quartet of vortices per cycle. The flow is found to undergo three-dimensional transition in the second vibration region, with a limited influence on the system behaviour. It appears that the transition occurs for a substantially lower rotation rate than for a rigidly mounted cylinder.

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Tài liệu tham khảo

10.1017/jfm.2012.353

10.1017/S0022112088001570

10.1016/S0889-9746(87)90158-7

10.1006/jfls.2000.0363

10.1017/jfm.2013.362

10.1017/S0022112009992060

10.1017/S0022112002002938

10.1017/jfm.2011.90

10.1017/S0022112007009202

10.1016/j.jfluidstructs.2006.04.003

Meena, 2011, IUTAM Symposium on Bluff Body Flows, IIT-Kanpur, India, 75

10.1017/S0022112009993764

10.1016/j.jfluidstructs.2008.06.001

Naudascher, 1994, Flow-induced Vibrations: An Engineering Guide

10.1098/rspa.1964.0005

10.1017/S0022112090002270

10.1017/S0022112000001233

10.1063/1.4758286

10.1063/1.1562940

10.1017/S0022112095003417

10.1017/S0022112005005197

10.1016/j.jfluidstructs.2012.12.004

10.1063/1.1492811

10.1146/annurev.fl.16.010184.001211

10.1016/0022-460X(92)90630-G

10.1017/S0022112098001074

10.1016/0889-9746(87)90243-X

10.1017/S0022112076000207

10.1017/jfm.2011.403

10.1017/S0022112008001390

10.1017/S0022112085002713

Prandtl, 1925, Application of the ‘Magnus effect’ to the wind propulsion of ships, Naturwissenschaft, 13, 93, 10.1007/BF01585456

10.1016/j.jfluidstructs.2014.03.010

Yogeswaran, 2011, IUTAM Symposium on Bluff Body Flows, IIT-Kanpur, India, 153

10.1017/S0022112000002214

10.1016/S0889-9746(88)90058-8

10.1063/1.870190

10.1002/fld.1650150911

10.1017/jfm.2012.542

Blevins, 1990, Flow-induced Vibration

10.1299/kikaib.65.2196

10.1017/CBO9780511760792

10.1016/0022-460X(76)90392-8

10.1017/S0022112093001533

Karniadakis, 1999, Spectral/hp Element Methods for CFD

10.1063/1.3258287

10.1017/jfm.2013.334

10.1017/jfm.2013.332

10.1016/j.jfluidstructs.2011.03.021

10.1017/jfm.2013.665

Zhao, 2013, Numerical simulation of vortex-induced vibration of a square cylinder at a low Reynolds number, Phys. Fluids, 25

10.1006/jfls.2000.0365

10.1017/jfm.2013.486

10.1016/j.jfluidstructs.2013.11.013

10.1017/S0022112090003342

10.1017/jfm.2014.167

Okajima, 2002, Flow-induced in-line oscillation of a circular cylinder in a water tunnel, Trans. ASME: J. Press. Vessel Technol., 124, 89

Zhao, 2014b, Vortex induced vibrations of a rotating circular cylinder at low Reynolds number, Phys. Fluids, 26

10.1006/jfls.1999.0236

10.1016/S0889-9746(88)80008-2

10.1016/0022-460X(77)90642-3

10.1146/annurev.fluid.36.050802.122128

10.1017/S0022112001004578

10.1016/j.jfluidstructs.2006.04.009

10.1016/j.jfluidstructs.2004.02.005

10.1016/j.jweia.2014.06.021

10.1109/T-AIEE.1932.5056223

10.1115/1.1631032

10.1016/S0022-460X(73)80133-6

10.1093/qjmam/17.2.225

10.1016/j.jfluidstructs.2013.02.017

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Thông tin xuất bản

Journal of Fluid Mechanics

Tập 781

127-165

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