... flow attack angles. Validation of C d and St for flow past a circular cylinder show good agreement with literature. Variation of the riser component outer profile and flow attack angle show variation in the drag and lift force experienced as well as the vortex shedding behavior. More accurate Re...

... at high Reynolds number. equation boundary layer mooring system high reynolds number cylinder production logging openfoam circular cylinder coefficient time history transition model flow regime reynolds number upstream oil & gas production monitoring turbulence model subsea system...

... sea bottom current cylinder plet span upstream oil & gas rms fatigue life plane boundary viv offshore pipeline interaction pipeline span modeling & simulation proximity span circular cylinder reduced velocity OTC 21070 Fluid-Structure Interaction Simulations...

... not exceed the value of 1–1.2 diameters for circular cylinders. VIV is normally associated with tall cylindrical bodies such as risers, tendons, flowlines and other tubular used by the offshore industry. Typical vibration amplitudes for risers reach up to 1 diameter for uniform flow. Among production...

... layers became turbulent in the critical Reynolds number range. Introduction and Background The study of flow separation and vortex shedding past a circular (or approximately circular) cylinder has a long history. Simple observation of flow past a vertical stick or reed in a stream indicates that man...

... - -- - -- - - - - - - - - - - - We have treated the hydrodynamic damping problem as a two-dimensional sinusoidal oscillation of a circular cylinder in an infinite viscous, incompressible fluid. The governing parameters have extreme values; we have small Keulegan-Carpenter numbers (KC = UmaxTId ~ 1) and large values of frequency...

... is a review of experimental research on vortex-induced transverse forces on smooth, rigid, fixed and elastically mounted circular cylinders, subjected to a variety of steady and periodic flows. The salient flow and geometric parameters influencing the vortex shedding process and thus the transverse force...

...) are not in a position to predict the force-transfer coefficients, even for a simple circular cylinder. No three-dimensional finite-difference solution of the Navier-Stokes equations for the flow past a cylinder of finite aspect ratio (with no slip condition on the cylinder and on the bounding end walls) exists...

...OTC 6518 Hydrodynamic Lift and Drag on Rough Circular Cylinders T. Sarpkaya, Naval Postgraduate School This paper was presented at the 23rd Annual OTC in Houston. Texas. May 6-9, 1991. This paper was selected for presentation by the OTC Program Committee following review of information contained...

... Kc numbers there is little time available for the flow-separation to initiate and develop behind a circular cylinder before the flow reversal occurs. This diminishes the chances for the for- mation of wakes on a circular cylinder. Considering the reso- nant oscillation of these large diameter...

... of existing jack-ups, when their fitness for use at a specific site is considered. While a large amount of experimental data has been gathered on smooth and rough circular cylinders in planar oscillatory flow and in waves, very little information is available fromtests with jack-up legs in such conditions...

... been smaller yet, to the degree that the moored model squatted in re- sponse to the flow around it. Pearcey, Cash, and Salter /13/ described exper- iments on circular cylinders in wind tunnels in which the value of the drag6 coefficien~ for Rey- nolds numbers between 5 x 10 and 9 x10 were al- most...

... rough circular cylinder circular cylinder harmonically smooth cylinder end plate coefficient reynolds number small cylinder hydrodynamic force rough cylinder drag coefficient cylinder maximum lift coefficient roughness high reynolds number experiment lift force mass coefficient...

...aTC 5099 Measured Fluid Forces on an Accelerated/Decelerated Circular Cylinder by A.A. Bird, consultant, and L.F. Mockros, Northwestern U. Copyright 1986 Offshore Technology Conference This paper was presented at the 18th Annual OTC in Houston, Texas; May 5-8, 1986. The material is subject...

... to copy is restricted to an abstract of not more than 300 words. ABSTRACT Measurements are presented of forces on a pair of ide.!tical parallel circular cylinders with a smC'oth surface under a steady uniform flow. The drag coeff- icient of the cylinders was found to be a continuous function...

... plywood models built on a scale 1:66.67 were used. As can be seen in Figure 1, one model is a shallow-draft circular cylinder with a full-scale diameter of 100 meters. The other model is similar to the first one up to the 10-meters waterline. where the waterplane area decreases substantially. 107...

...OTC 4830 Hydrodynamic Forces From Combined Wave and Current Flow on Smooth and Rough Circular Cylinders at High Reynolds Numbers by T. Sarpkaya, C. Bakmis, and M.A. Storm, Naval Postgraduate School This paper was presented at the 16th Annual OTC in H9uston, Texas, May 7-9, 1984. The material...

... theory to a second approximation based on the Stokes expansion procedure. This has been attempted by a number of authors for the particular case of a surface piercing vertical circular cylinder, and by Garrison for the general case of a body of arbitrary shape. For the extreme case of steep waves...

... circular cylinder frequency ABSTRACT This paper describes the drag coefficients of cylinders oscillated in both in-line and transverse directions to a uniform flow. The drag coefficients C D have been obtained experimentally over a wide range of oscillating frequencies, amplitude and flow...

... Abstract The forces acting on yawed smooth and rough circular cylinders in a sinusoid ally oscillating planar flow have been investigated experimentally and the force transfer coefficients have been evaluated. The results have shown that the so-called "independence principle" does not hold...