Multi Mode Vortex Induced Vibrations Of A Flexible Circular Cylinder

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Multi Mode Vortex Induced Vibrations Of A Flexible Circular Cylinder

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Author : Franscisco J. Huera Huarte
language : en
Publisher:
Release Date : 2006

Multi Mode Vortex Induced Vibrations Of A Flexible Circular Cylinder written by Franscisco J. Huera Huarte and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

Modelling And Analysis Of Vortex Induced Vibrations Of Rigid And Flexible Cylinders

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Author : Hossein Zanganeh
language : en
Publisher:
Release Date : 2014

Modelling And Analysis Of Vortex Induced Vibrations Of Rigid And Flexible Cylinders written by Hossein Zanganeh and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.

Vortex-induced vibration (VIV) is a fundamental phenomenon commonly encountered in various practical engineering. Owing to the complexities associated with this phenomenon, modelling and prediction of VIV is a challenging task. In this research, a new predictive phenomenological model is developed for VIV of an elastically mounted rigid cylinder subjected to a fluid flow and free to vibrate in both cross-flow (CF) and in-line (IL) directions. The ensuing dynamical system is based on double Duffing-van der Pol (structural-wake) oscillators with the two structural equations containing both cubic and quadratic nonlinear terms. The cubic nonlinearities capture the geometrical coupling of CF/IL displacements excited by hydrodynamic lift/drag forces whereas the quadratic nonlinearities allow the fluid-structure interactions. The model predictions are extensively compared with published and in-house experimental results. Experiments are carried out at the Department's towing tank to calibrate and validate numerical prediction results. Comparisons illustrate the qualitative resemblance between experimental and prediction results, highlighting how the new model can capture several important VIV characteristics including a two-dimensional lock-in, jump and hysteresis phenomenon, and figure-of-eight trajectory tracing the periodically coupled CF/IL oscillations. Moreover, the parametric studies reveal the important effect of geometrical nonlinearities, mass ratio, damping ratio and natural frequency ratio. Insights into hydrodynamic properties such as VIV-induced mean drag, added mass and damping are drawn based on the newly proposed model via analytical-numerical approaches and comparisons with published literature. Consequently, the new prediction model is applied to the VIV analysis of flexible circular cylinders subjected to uniform and linearly sheared currents. To capture a three-dimensional aspect of the flexible cylinder experiencing VIV, nonlinear equations of CF, IL and axial structural oscillations are considered to be coupled with the distributed van der Pol wake-oscillators. Governing equations are numerically solved via a space-time finite difference scheme, and the obtained numerical results highlight several aspects of VIV of elastic cylinders along with the axial motion effects. Apart from the validation of the numerical model with published experimental results, this study reveals how the effect of axial motion and its nonlinear coupling with the two transverse CF/IL motions can be very important. These depend on the reduced velocity, the fluid-structure parameters, the single or multi-mode lock-in condition, and the standing-wave versus travelling-wave features.

Hydrodynamics Around Cylindrical Structures

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Author : Jorgen Fredsoe
language : en
Publisher: World Scientific
Release Date : 1997-03-17

Hydrodynamics Around Cylindrical Structures written by Jorgen Fredsoe and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997-03-17 with categories.

This book discusses the subject of wave/current flow around a cylinder, the forces induced on the cylinder by the flow, and the vibration pattern of slender structures in a marine environment.The primary aim of the book is to describe the flow pattern and the resulting load which develops when waves or current meet a cylinder. Attention is paid to the special case of a circular cylinder. The development in the forces is related to the various flow patterns and is discussed in detail. Regular as well as irregular waves are considered, and special cases like wall proximities (pipelines) are also investigated.The book is intended for MSc students with some experience in basic fluid mechanics and for PhD students.

Modal Excitation Of A Flexible Cylinder Undergoing Vortex Induced Vibrations

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Author : Harrison P. Zimmer
language : en
Publisher:
Release Date : 2014

Modal Excitation Of A Flexible Cylinder Undergoing Vortex Induced Vibrations written by Harrison P. Zimmer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with Offshore structures categories.

A Critical Review Of The Intrinsic Nature Of Vortex Induced Vibrations

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Author : Turgut Sarpkaya
language : en
Publisher:
Release Date : 2003

A Critical Review Of The Intrinsic Nature Of Vortex Induced Vibrations written by Turgut Sarpkaya and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Vibration categories.

This is a concise and comprehensive review of the progress made during the past two decades on vortex induced vibration (VIV) of mostly circular cylindrical structures subjected to steady uniform flow. The critical elements of the evolution of the ideas, theoretical insights, experimental methods, and numerical models are traced systematically; the strengths and weaknesses of the current state of the understanding of the complex fluid/structure interaction are discussed in some detail. Finally, some suggestions are made for further research on VIV. The organization of the paper is given at the end of the next section.

Interference Effects On The Flow Induced Vibration Of A Flexible Circular Cylinder Due To A Larger Sized Cylinder In The Vicinity

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Author : 杜平
language : en
Publisher: Open Dissertation Press
Release Date : 2017-01-27

Interference Effects On The Flow Induced Vibration Of A Flexible Circular Cylinder Due To A Larger Sized Cylinder In The Vicinity written by 杜平 and has been published by Open Dissertation Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-01-27 with categories.

This dissertation, "Interference Effects on the Flow-induced Vibration of a Flexible Circular Cylinder Due to a Larger-sized Cylinder in the Vicinity" by 杜平, Ping, To, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. DOI: 10.5353/th_b3123776 Subjects: Vibration Cylinders Fluid dynamics

Vortex Induced Vibration Of A Circular Cylinder

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Author : 朱執均
language : en
Publisher:
Release Date : 2011

Vortex Induced Vibration Of A Circular Cylinder written by 朱執均 and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Flow Induced Vibration

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Author : Robert D. Blevins
language : en
Publisher:
Release Date : 1977

Flow Induced Vibration written by Robert D. Blevins and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1977 with Science categories.

Vortex Induced Vibrations Of A Pivoted Circular Cylinder And Their Control Using A Tuned Mass Damper

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Author : Sina Kheirkhah
language : en
Publisher:
Release Date : 2011

Vortex Induced Vibrations Of A Pivoted Circular Cylinder And Their Control Using A Tuned Mass Damper written by Sina Kheirkhah and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.

Vortex-induced vibrations of a pivoted circular cylinder and control of these vibrations were investigated experimentally.

Vortex Induced Vibrations Of An Elastically Mounted Circular Cylinder In Two Degrees Of Freedom

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Author : Salim Koç
language : en
Publisher:
Release Date : 2002

Vortex Induced Vibrations Of An Elastically Mounted Circular Cylinder In Two Degrees Of Freedom written by Salim Koç and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002 with categories.