## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volumes 1-2American Society of Mechanical Engineers, 1991 - Arctic regions |

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Page 74

In the present model an integrated boundary

the time varying shear stresses and the movement of the discrete vortices

between the first grid point and the surface of the cylinders . 8 is the thickness of

the ...

In the present model an integrated boundary

**layer**model is used for determiningthe time varying shear stresses and the movement of the discrete vortices

between the first grid point and the surface of the cylinders . 8 is the thickness of

the ...

Page 75

Hydraulic Rough Boundary

velocity profile is described by : +1 ) ( 21 ) V = Vilni y 30 +1 ] kg ( 15 ) к which is a

good approximation to the velocity profile through all of the boundary

where ...

Hydraulic Rough Boundary

**Layer**In the case of the rough boundary**layer**thevelocity profile is described by : +1 ) ( 21 ) V = Vilni y 30 +1 ] kg ( 15 ) к which is a

good approximation to the velocity profile through all of the boundary

**layer**.where ...

Page 76

By integration of Eq . over the boundary

rotation in the boundary

of vorticity boundary

and ...

By integration of Eq . over the boundary

**layer**it is found that the total amount ofrotation in the boundary

**layer**is : 018 ) - ** wdy = -v , ( 24 ) in the 6 The total fluxof vorticity boundary

**layer**is given by : v ? vwdy ý V , dt ( 25 ) From Egs . ( 24 )and ...

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### Contents

SPECIAL SESSION HYDRODYNAMICS | 1 |

HYDRODYNAMIC FORCES | 29 |

SECONDORDER EFFECTS | 113 |

Copyright | |

47 other sections not shown

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### Common terms and phrases

acting amplitude analysis angle applied approach approximately assumed average body boundary cable calculated circular cylinder coefficients compared comparison components computed considered constant corresponding cylinder damping depth described determined diffraction direction distribution domain drag drift force effect element Engineering equation estimates experimental experiments expressed field Figure floating flow fluid follows free surface frequency function given height horizontal hydrodynamic incident included increase integral irregular waves length lift force linear loads mass maximum mean measured method mode mooring motion natural nonlinear obtained Ocean Offshore oscillation period phase platform points position potential predicted present pressure problem random range regular relative represents respectively response second order second-order separation ship shown shows simulation solution spectrum structure surge Table tests theory values velocity vertical vortex wave forces