## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 2; Volume 8, Part 2American Society of Mechanical Engineers, 1989 - Arctic regions |

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Page 478

ORIGIN OF

potential

follows : i ) Dww : on ii ) Dez : the

ORIGIN OF

**DRIFT FORCES**AT RESONANCE From first principles , since thepotential

**drift force**is of second order , there must be three components asfollows : i ) Dww : on ii ) Dez : the

**drift force**a stationary platform in waves . the**drift force**...Page 479

F = < z F ( 0 ) > + < F , Oy > ( 25 ) since by Blasius theorem , there is no force in a

steady irrotational flow ( quasi - steady by the long wave assumption ) . OF A

HEAVING VERTICAL COLUMN NEAR

iii ...

F = < z F ( 0 ) > + < F , Oy > ( 25 ) since by Blasius theorem , there is no force in a

steady irrotational flow ( quasi - steady by the long wave assumption ) . OF A

HEAVING VERTICAL COLUMN NEAR

**DRIFT FORCES**RESONANCE some foriii ...

Page 544

PROBABILITY DISTRIBUTION OF

probability FIG . ... following conclusions : a ) Low frequency second order

viscous

frequency ...

PROBABILITY DISTRIBUTION OF

**DRIFT FORCES**Gaussian scale Cumulativeprobability FIG . ... following conclusions : a ) Low frequency second order

viscous

**drift force**is characterised by a fairly broad band spectrum over thefrequency ...

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### Contents

HYDRODYNAMIC FORCES | 1 |

WaveCurrent Force on Horizontal Cylinder | 7 |

DoubleFactor Method for the Linearization of Drag Force | 39 |

Copyright | |

45 other sections not shown

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### Common terms and phrases

added mass amplitude analysis applied approach approximately assumed body boundary calculated circular compared components computed considered correlation corresponding cylinder damping defined depends depth described determined direction distribution drag coefficient drift force effect elements Engineering equation estimate experimental experiments expressed extreme factor failure Figure flow fluid free surface frequency function given horizontal hydrodynamic important in-line included increase indicate integral length lift lift force linear load maximum mean measured Mechanics method mode motion nonlinear normal obtained Offshore oscillation parameters period pipeline potential predicted present pressure probability problem random range ratio reference relative reliability represented respectively response second order separation shear ship shown shows simulation solution structure surface Table term tests theory transverse uncertainty variables varying velocity vertical vortex wave force wave height