... upstream tubular displacement ratio diameter ratio offshore technology conference vortex production riser diameter tubular vortice Allen , D. W. 1992 . Vortex-Induced Vibration of Cylindrical Structures in Sheared Flow . A Joint Industry Program to Develop a Response Prediction...

... CFD methods. The velocity distribution around the BOP stack at a uniform flow velocity of 2.51 ft/s is depicted in Figure 2a and Figure 2b. The flow field shows formation of vortices in the wake of the BOP stack. The drag coefficient of the BOP stack during upward motion is 0.87 and downward motion...

... the 2D-vorticity equation is solved by a Vortex-in-Cell method and the different fluid sections are coupled through the boundary conditions from the motion of the riser. This procedure is used to solve the vortex-induced vibration (VIV) response of flexible risers. Both vertical risers and steel catenary...

... reynolds number engineering simulation equation coefficient houston individual cylinder vortice rotation offshore technology conference oscillatory flow assumption flow angle configuration discrete vortice simulated turbulent flow aTC 6577 Simulated Turbulent Flow and Forces Around Groups...

... of pressures induced by wake vortices at the cylinder surface were discussed. At a KC number of 2.6 and Re number of 2770, the pressure distribution was found to be reasonably smooth with no vortex formation. At a KC number of 5.1 and Re number of 2010, a pair of vortices caused local depression...

... assessment span cross-flow response offshore pipeline rough span roughness onset pipeline span submarine pipeline span strouhal number threshold natural frequency frequency hysteresis effect vortex smooth span vortice proximity upstream oil & gas dynamic testing full...

... previously defined. The time t is measured from the onset of flow and the group Ut/d is related to the strength of the vortices formed as the flow progresses. Values of CD and SM were determined by estimating vortex strengths from high speed motion pic- tures taken of the uniformly accelerating flow...

... on the drag and mass co-efficients and variations with Reynolds number. There are two basic sources of dynamic loads; those due to wave energy act- ing as a direct forcing function and those due to the shedding of vortices, which are modified by the acceleration of the flow due to waves. In practice...