Numerical study of vortex induced vibration of circular cylinder
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Inclou dades d'ús des de 2022
Cita com:
hdl:2117/332575
Tipus de documentText en actes de congrés
Data publicació2015
EditorCIMNE
Condicions d'accésAccés obert
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Abstract
In many ocean engineering, vortex induced vibration of slender structures such as a
riser has long been a nemesis to be investigated and yet to be fully understood.
Numerous experimental and computational studies approaches have reveal the many aspects
of the phenomenon and tried different measures for mitigation of the related damages. However, due
to complexity of interaction between deformable structure and unsteady hydrodynamic forces, both
experimental and computational models are not easy tasks. In this study, a computational fluid
model is applied to simulate the unsteady flow passing the circular cross section while the body
is freely moving under the influence of hydrodynamic forces caused by vortex shedding.
Finite volume method is utilized. In order to implement the movement of the body influenced by
the hydrodynamic force, meshes around the moving body are reconfigured considering the
new location at every time step of computation. Both mechanical damping and stiffness are
assumed when the equation of motion of the oscillatory body is solved at every time step. One
degree of freedom with damping and stiffness in cross-flow direction is considered with free
oscillation under the influence of hydrodynamic forces caused by vortex shedding. The results show
that the maximum amplitude of the cross flow vibration exceeds more than half of the diameter of
the cylinder and it can deform the whole system to a great extent. In particular, two distinct
periods of fluctuating hydrodynamic forces are identified with smaller periods corresponds
to secondary shedding between primary vortex shedding due to shear caused by movement of the
body. In addition, vortex shedding of frequency near the natural frequency of the structural
system clearly reveals the lock-in behavior and the
large divergent movement is also observed with lower damping.
CitacióLee, S. [et al.]. Numerical study of vortex induced vibration of circular cylinder. A: MARINE VI. "MARINE VI : proceedings of the VI International Conference on Computational Methods in Marine Engineering". CIMNE, 2015, p. 981-986. ISBN 978-84-943928-6-3.
ISBN978-84-943928-6-3
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Marine-2015-79_NUMERICAL STUDY OF VORTEX.pdf | 472,0Kb | Visualitza/Obre |