... reasonably accurate estimates of the fatigue damage rate over the entire riser length. condition monitoring fatigue offshore installations sensor placement structural engineering vibrations vortices 02 01 2011 13 09 2011 02 02 2012 02 02 2012 2012 American Society...

...-phase flow vortices 10 11 2010 29 06 2011 01 02 2012 01 02 2012 2012 American Society of Mechanical Engineers ...

... on Ocean Engineering), World Scientific , Singapore , Vol. 17 . 25 01 2010 27 05 2011 05 12 2011 05 12 2011 boundary layer turbulence external flows flow instability hydrodynamics Navier-Stokes equations pipelines vortices numerical models circular marine...

... absorbers structural engineering turbulence vibration control vortices wakes The present work investigates the hysteresis effect on the vortex induced vibration (VIV) of a circular cylinder that is restricted to move in the in-line direction and free to vibrate in the transverse direction...

... ) 01 04 2010 06 12 2010 13 10 2011 13 10 2011 damping design engineering offshore installations vortices water waves vortext-induced motion (VIM) monocolumn platform spar platform model test In general terms, the VIM phenomenon represents a type of fluid...

... a force free condition on the wake ( 8 ). 12 03 2010 02 11 2010 12 10 2011 12 10 2011 blades shapes (structures) tidal power stations turbines vortices tidal/ocean current turbines vortex-lattice method (VLM) lifting line theory optimum loading on turbines...

... to high V r n ≅ 12 values. This V r n ≅ 12 value had not been obtained in NMRI-2007 tests. 11 12 2009 10 12 2010 12 10 2011 12 10 2011 design engineering offshore installations petroleum industry vortices vortex-induced motion (VIM...

...J. Baltazar; J. A. C. Falcão de Campos A low order potential based panel code is used to analyze the flow around the blades of a horizontal axis marine current turbine. An empirical vortex model is assumed for the turbine wake, which includes the variation of pitch of the helicoidal vortices...

...) surface roughness vibrations vortices Marine risers are essential for the offshore petroleum industry. Risers are used for the drilling of subsea wells, for well intervention, and also for the flow of well fluids to production facilities at the sea surface. Furthermore, export risers take...

... at different angular positions depending on the turbulence of the flow (characterized by Reynolds number). Vortices are shed alternatively from the two shear layers on both sides of the cylinder, with associated changes in the pressure distributions around the cylinder surface. The shedding of vortices (a Von...

... it moves around the hull with the increasing velocities and, when in reaches 60 deg from the bow of the platform, the separation point is fixed in both fairleads. Therefore, for V r n > 11 , vortices are shed prematurely and the vortex street is less uniform and correlated causing...

.... The differences between the results of the two different numerical methods are within 7% of the value generated using the conformal mapping method. Additionally, as the free-surface effect is avoided in both numerical methods, we can also compare the development of the downstream vortices. The geometries...

... equations shear turbulence vibrations vortices The recent high oil prices and the prevailing unstable situation in the Middle East gives the offshore industry in the U.S. a more important and challenging status. Since the U.S. domestic offshore industry has a seemingly prosperous future...

... beam motion equation with external force obtained by integrating viscous and pressure loads on the riser surface. Then the critical parameters including riser VIV amplitude (a) to the riser outer diameter (D) ratio (a/D), vorticity contours, and motion trajectories were processed. The same parameters...

... 2009 22 12 2009 damping hydrodynamics numerical analysis offshore installations ships vortices Floating production, storage and offloading vessels (FPSOs) are becoming increasingly popular for extracting oil and gas from offshore areas. Although most FPSOs are designed...

... to shedding of incomplete or nongeneration of bottom vortices. Since the top vortex is less partially diffused by the opposite sign vorticity from the bottom vortex, the loss of vorticity is reduced ( 35 36 ). This results in an increase in the strength of the top vortices compared with unbounded cases...

... , “ The Occurrence of Lock-In Under Highly Sheared Condition ,” J. Fluids Struct. , 10 , pp. 555 – 561 . 0889-9746 27 06 2007 07 09 2008 26 02 2009 oil drilling statistical analysis vibrations vortices This study, divided into three parts, is concerned with the analysis...

... at velocity U = 0.840 m ∕ s = 1.63 Kn . damping direct energy conversion power transmission (mechanical) renewable energy sources springs (mechanical) supports turbulence vibrations vortices Generation of energy by a VIVACE converter is based on extracting kinetic energy from a fluid flow...

..., the multiple solutions also are all stable. Variation of amplitude with forcing amplitude (Period 2 solution; both sweep; C D = 0.1 ) 15 01 2007 05 04 2008 15 10 2008 drag flow instability fluid oscillations hydrodynamics ropes vibrations vortices...

... converters is presented as well. 30 01 2007 10 07 2007 16 09 2008 damping life cycle costing patents renewable energy sources vibrations vortices Ocean energy in the form of waves, currents, tides, and thermal and salinity gradients can provide an abundant supply...