Hydrodynamics around cylindrical structures

Library	Item Barcode	Call Number	Material Type	Item Category 1	Status
Searching... PSZ JB	30000010141738	TC1665 S96 2006	Open Access Book	Book	Searching... Unknown
Searching... PSZ KL	30000010141737	TC1665 S95 2006	Open Access Book	Book	Searching... Unknown

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.

Author Notes

Jorgen Fredsoe is Professor at the Technical University of Denmark, MEK, Coastal, Maritime and Structural Engineering Section.

Preface	p. v
Credits	p. vii
List of Symbols	p. ix
1 Flow around a cylinder in steady current
1.1 Regimes of flow around a smooth, circular cylinder	p. 1
1.2 Vortex shedding	p. 6
1.2.1 Vortex-shedding frequency	p. 10
1.2.2 Correlation length	p. 28
References	p. 33
2 Forces on a cylinder in steady current
2.1 Drag and lift	p. 37
2.2 Mean drag	p. 40
2.3 Oscillating drag and lift	p. 50
2.4 Effect of cross-sectional shape on force coefficients	p. 52
2.5 Effect of incoming turbulence on force coefficients	p. 53
2.6 Effect of angle of attack on force coefficients	p. 55
2.7 Forces on a cylinder near a wall	p. 57
References	p. 70
3 Flow around a cylinder in oscillatory flows
3.1 Flow regimes as a function of Keulegan-Carpenter number	p. 74
3.2 Vortex-shedding regimes	p. 78
3.3 Effect of Reynolds number on flow regimes	p. 89
3.4 Effect of wall proximity on flow regimes	p. 92
3.5 Correlation length	p. 104
3.6 Streaming	p. 116
References	p. 120
4 Forces on a cylinder in regular waves
4.1 In-line force in oscillatory flow	p. 123
4.1.1 Hydrodynamic mass	p. 124
4.1.2 Froude-Krylov force	p. 129
4.1.3 The Morison equation	p. 130
4.1.4 In-line force coefficients	p. 133
4.1.5 Goodness-of-fit of the Morison equation	p. 147
4.2 Lift force in oscillatory flow	p. 149
4.3 Effect of roughness	p. 153
4.4 Effect of coexisting current	p. 157
4.5 Effect of angle of attack	p. 161
4.6 Effect of orbital motion	p. 163
4.6.1 Vertical cylinder	p. 163
4.6.2 Horizontal cylinder	p. 169
4.7 Forces on a cylinder near a wall	p. 180
4.8 Forces resulting from breaking-wave impact	p. 187
References	p. 201
5 Mathematical and numerical treatment of flow around a cylinder
5.1 Direct solutions of Navier-Stokes equations	p. 210
5.1.1 Governing equations	p. 211
5.1.2 The Oseen (1910) and Lamb (1911) solution	p. 211
5.1.3 Numerical solutions	p. 219
5.1.4 Application to oscillatory flow	p. 227
5.2 Discrete vortex methods	p. 233
5.2.1 Numerical simulation of vorticity transport	p. 234
5.2.2 Procedure used in the implementation of discrete vortex method	p. 237
5.2.3 Application areas	p. 242
5.3 Hydrodynamic stability approach	p. 248
References	p. 266
6 Diffraction effect. Forces on large bodies
6.1 Vertical circular cylinder	p. 276
6.1.1 Analytical solution for potential flow around a vertical circular cylinder	p. 276
6.1.2 Total force on unit-height of cylinder	p. 282
6.1.3 Total force over the depth and the overturning moment	p. 287
6.2 Horizontal circular cylinder near or on the seabottom. Pipelines	p. 289
References	p. 295
7 Forces on a cylinder in irregular waves
7.1 Statistical treatment of irregular waves	p. 297
7.1.1 Statistical properties of surface elevation	p. 298
7.1.2 Statistical properties of wave height	p. 312
7.1.3 Statistical properties of wave period	p. 315
7.1.4 Long-term wave statistics	p. 318
7.2 Forces on cylinders in irregular waves	p. 319
7.2.1 Force coefficients	p. 319
7.2.2 Force spectra	p. 325
7.2.3 Forces on pipelines in irregular waves	p. 328
7.2.4 Forces on vertical cylinders in directional irregular waves	p. 330
References	p. 330
8 Flow-induced vibrations of a free cylinder in steady currents
8.1 A summary of solutions to vibration equation	p. 335
8.1.1 Free vibrations without viscous damping	p. 336
8.1.2 Free vibrations with viscous damping	p. 336
8.1.3 Forced vibrations with viscous damping	p. 338
8.2 Damping of structures	p. 342
8.2.1 Structural damping	p. 342
8.2.2 Fluid damping in still fluid	p. 346
8.3 Cross-flow vortex-induced vibrations of a circular cylinder	p. 353
8.3.1 Feng's experiment	p. 354
8.3.2 Non-dimensional variables influencing cross-flow vibrations	p. 364
8.4 In-line vibrations of a circular cylinder	p. 376
8.5 Flow around and forces on a vibrating cylinder	p. 383
8.5.1 Cylinder oscillating in the cross-flow direction	p. 383
8.5.2 Cylinder oscillating in in-line direction	p. 396
8.6 Galloping	p. 397
8.7 Suppression of vibrations	p. 407
References	p. 413
9 Flow-induced vibrations of a free cylinder in waves
9.1 Introduction	p. 418
9.2 Cross-flow vibrations	p. 421
9.2.1 General features	p. 423
9.2.2 Effect of mass ratio and stability parameter	p. 432
9.2.3 Effect of Reynolds number and surface roughness	p. 432
9.2.4 Cross-flow vibrations in irregular waves	p. 436
9.3 In-line vibrations	p. 441
9.4 In-line oscillatory motion	p. 443
9.5 Flow around and forces on a vibrating cylinder	p. 445
References	p. 450
10 Vibrations of marine pipelines
10.1 Cross-flow vibrations of pipelines	p. 455
10.1.1 Cross-flow vibrations of pipelines in steady current	p. 455
10.1.2 Cross-flow vibrations of pipelines in waves	p. 465
10.2 In-line vibrations and in-line motions of pipelines	p. 471
10.3 Effect of Reynolds number	p. 473
10.4 Effect of scoured trench	p. 479
10.5 Vibrations of pipelines in irregular waves	p. 481
10.6 Effect of angle of attack	p. 486
10.7 Forces on a vibrating pipeline	p. 486
References	p. 491
11 Mathematical modelling of flow-induced vibrations
11.1 The steady-current case	p. 497
11.1.1 Simple models	p. 497
11.1.2 Flow-field models	p. 499
11.2 The wave case	p. 503
11.3 Integrated models	p. 506
References	p. 510
Appendix I Force coefficients for various cross-sectional shapes	p. 514
Appendix II Hydrodynamic-mass coefficients for two- and three- dimensional bodies	p. 517
Appendix III Small amplitude, linear waves	p. 519
References for Appendices	p. 521
Author Index	p. 522
Subject Index	p. 527

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