... and with a top part still above the water surface. Thus, the water depth also has an influence on the dynamics responses of a drilling riser. cross flow direction displacement experiment characteristic flume frequency drilling riser water depth inline vibration maximum strain vibration...

... coefficient amplitude test cylinder vibration cylinder power coefficient vortex-induced vibration frequency force coefficient mean lift coefficient lift coefficient inline motion motion parameter prediction experiment polar plot cross-flow motion inline hydrodynamic force upstream oil...

... cfd simulation long marine riser fatigue damage inline vortex-induced vibration marine riser pontaza time step chen engineering crossflow motion upstream oil & gas configuration simulation time history proceedings riser grid experiment algorithm 3D VIV Fatigue Analysis...

... an extreme wave in a random sea, we employ focused waves to model extreme events. Using recently introduced experimental methodologies we accurately generate steep non-linear focused waves propagating over the sheared, inline and opposing currents. One of the comparative advantages of this methodological...

... numerical simulation main particular numerical tension calibration stability upstream oil & gas dts mooring system inline Model Test and Simulation of a New Concept of Dry Tree Semi-Submersible XL.Qi , GS.LV, Y.Luo,WQ.Zhu, YG.Zhang COTEC Offshore Engineering Solutions Beijing,China ABSTRACT...

... ABSTRACT In this paper, inline and transverse forces on elliptical cylinder immersed in the wake of circular cylinder are carefully evaluated. The effects of variations on characteristic dimension, inline and transverse position of the elliptical cylinder are determined through numerical...

... ABSTRACT: This paper presents vibration amplitude and hydrodynamic force (inline and lift) measurements during vortex-induced vibration of a tensioned horizontally-mounted cylinder with low-mass ratio, low bending- stiffness, subcritical Reynolds numbers range and rather high aspect-ratio...

.... model test vortex-induced vibration normalized instantaneous displacement riser pipe cylinder vortex visualization oscillation numerical simulation vibration upstream oil & gas simulation visualization inner flow vortex dual-pipe system pipe system inline downstream pipe multi...

... ABSTRACT Measurements are made of vortex-induced vibration of an elastically supported circular cylinder in water with reduced velocity (U/fnD) from 2 to 12, damping factors from 0.2% to 20% of critical damping, mass ratios (m/ρD2) from 2.8 to 17, and transverse, inline, and combined inline...

... coefficient inline oscillator displacement Flow Induced Vibrations Modeled by Coupled Non-linear Oscillators Gunnar K. Furnes Kristian Sørensen Norsk Hydro Research Centre Geophysical Institute, University of Bergen Bergen, Norway Bergen, Norway ABSTRACT This paper deals with modeling a free span...

.... response diagram jumper viv pipeline fatigue damage frequency inline jumper viv response diagram viv current speed strake cross-flow viv response diagram natural frequency upstream oil & gas current velocity minimum viv fatigue life Jumper VIV New Issues for New Frontiers Andrew L...

... protection was proposed by using geotextile sand containers. Fig.1 shows a sketch of such a scour protection and the proposed model set-up for large-scale tests in the GWK. displacement gwk monopile structure inline displacement scour protection exemplarily transverse container sand container...

... termination is connected to a gooseneck fixed to the top of the subsurface buoy. displacement transverse direction upstream oil & gas riser motion diameter inline direction amplitude envelop coefficient inline riser current velocity dynamic behavior analytical solution only current...

... to vortex-shedding, as well as the relationship between inline and cross-flow motion, is still less well understood. Many experimental studies have been focusing on determining the motion magnitude of VIV and on various factors that have influence on the level of vibration intensity, such as lift...

... inline oscillating cylinders with helical strakes of various configurations were performed. These results showed that the helical strakes with the height of 0.06D and the pitch of 2.5D are most effective for reducing the lift force in the present cases. Hydrodynamic force measurements and flow...

... the vortex shedding in such a way that the shedding frequency locks on to the resonant frequency of the structure. vortex coupling cross-flow direction inline oscillation cross-flow response contribution offshore pipeline oscillation natural frequency cylinder experimental investigation...

... by Corporation for Advanced Transport and Technology. wind velocity drag force test section multiple column reynolds wind drag force column experiment inline column thickness multiple column experiment comer inflow ratio drag coefficient coefficient drag force coefficient ssmf experiment...

... cylinder pipe norsk hydro research centre bergen standard deviation model test hydrodynamic interaction non-dimensional inline navsim upstream cylinder transverse relative position simulation inline model pipe cylinder interaction Proceedings of the Eleventh (2001) International Offshore...

..., and underwater risers and cables and result from fluid vortex-shedding. Alternate vortex shedding leads to time and space dependent pressure excitation on the structure. natural frequency circular cylinder cylinder amplitude inline experimental measurement cable model coefficient vortex-induced...

... these motions with the line specimens. upstream oil & gas carriage oscillator subsea system mooring system oscillation direction specimen drift frequency drag coefficient frequency frequency motion oscillation line hydrodynamic inline lin university college london london hf motion...