Hydrodynamics Around Cylindrical Structures (Revised Edition)

by Jorgen Fredsoe, B Mutlu Sumer

Overview

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. Special attention is paid to 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.

Product Details

ISBN-13:	9789812700391
Publisher:	World Scientific Publishing Company, Incorporated
Publication date:	09/21/2006
Series:	Advanced Series On Ocean Engineering , #26
Edition description:	Revised
Pages:	548
Product dimensions:	6.00(w) x 9.00(h) x 1.19(d)

Table of Contents

Preface     v
Credits     vii
List of Symbols     ix
Flow around a cylinder in steady current
Regimes of flow around a smooth, circular cylinder     1
Vortex shedding     6
Vortex-shedding frequency     10
Correlation length     28
References     33
Forces on a cylinder in steady current
Drag and lift     37
Mean drag     40
Oscillating drag and lift     50
Effect of cross-sectional shape on force coefficients     52
Effect of incoming turbulence on force coefficients     53
Effect of angle of attack on force coefficients     55
Forces on a cylinder near a wall     57
References     70
Flow around a cylinder in oscillatory flows
Flow regimes as a function of Keulegan-Carpenter number     74
Vortex-shedding regimes     78
Effect of Reynolds number on flow regimes     89
Effect of wall proximity on flow regimes     92
Correlation length     104
Streaming     116
References     120
Forces on a cylinder in regular waves
In-line force in oscillatory flow     123
Hydrodynamic mass     124
Froude-Krylov force     129
The Morison equation     130
In-line force coefficients     133
Goodness-of-fit of the Morison equation     147
Lift force in oscillatory flow     149
Effect of roughness     153
Effect of coexisting current     157
Effect of angle of attack     161
Effect of orbital motion     163
Vertical cylinder     163
Horizontal cylinder     169
Forces on a cylinder near a wall     180
Forces resulting from breaking-wave impact     187
References     201
Mathematical and numerical treatment of flow around a cylinder
Direct solutions of Navier-Stokes equations     210
Governing equations     211
The Oseen (1910) and Lamb (1911) solution     211
Numerical solutions     219
Application to oscillatory flow     227
Discrete vortex methods     233
Numerical simulation of vorticity transport     234
Procedure used in the implementation of discrete vortex method     237
Application areas     242
Hydrodynamic stability approach     248
References     266
Diffraction effect. Forces on large bodies
Vertical circular cylinder     276
Analytical solution for potential flow around a vertical circular cylinder     276
Total force on unit-height of cylinder     282
Total force over the depth and the overturning moment     287
Horizontal circular cylinder near or on the seabottom. Pipelines     289
References     295
Forces on a cylinder in irregular waves
Statistical treatment of irregular waves     297
Statistical properties of surface elevation     298
Statistical properties of wave height     312
Statistical properties of wave period     315
Long-term wave statistics     318
Forces on cylinders in irregular waves     319
Force coefficients     319
Force spectra     325
Forces on pipelines in irregular waves     328
Forces on vertical cylinders in directional irregular waves     330
References     330
Flow-induced vibrations of a free cylinder in steady currents
A summary of solutions to vibration equation     335
Free vibrations without viscous damping     336
Free vibrations with viscous damping     336
Forced vibrations with viscous damping     338
Damping of structures      342
Structural damping     342
Fluid damping in still fluid     346
Cross-flow vortex-induced vibrations of a circular cylinder     353
Feng's experiment     354
Non-dimensional variables influencing cross-flow vibrations     364
In-line vibrations of a circular cylinder     376
Flow around and forces on a vibrating cylinder     383
Cylinder oscillating in the cross-flow direction     383
Cylinder oscillating in in-line direction     396
Galloping     397
Suppression of vibrations     407
References     413
Flow-induced vibrations of a free cylinder in waves
Introduction     418
Cross-flow vibrations     421
General features     423
Effect of mass ratio and stability parameter     432
Effect of Reynolds number and surface roughness     432
Cross-flow vibrations in irregular waves     436
In-line vibrations     441
In-line oscillatory motion     443
Flow around and forces on a vibrating cylinder     445
References     450
Vibrations of marine pipelines
Cross-flow vibrations of pipelines     455
Cross-flow vibrations of pipelines in steady current      455
Cross-flow vibrations of pipelines in waves     465
In-line vibrations and in-line motions of pipelines     471
Effect of Reynolds number     473
Effect of scoured trench     479
Vibrations of pipelines in irregular waves     481
Effect of angle of attack     486
Forces on a vibrating pipeline     486
References     491
Mathematical modelling of flow-induced vibrations
The steady-current case     497
Simple models     497
Flow-field models     499
The wave case     503
Integrated models     506
References     510
Force coefficients for various cross-sectional shapes     514
Hydrodynamic-mass coefficients for two- and three- dimensional bodies     517
Small amplitude, linear waves     519
References for Appendices     521
Author Index     522
Subject Index     527