VORTEX-INDUCED VIBRATION REDUCTION DEVICE FOR FLUID IMMERSED CYLINDERS

摘要

A mechanism (77) to be applied to an exterior surface of a cylindrical structure (68) for reduction of the effect of Vortex Induce Vibration (VIV) in the cylindrical structure when immersed in flowing fluid. The mechanism (77) is provided with a generally cylindrical column having a central axis, an interior surface corresponding in size and shape to the exterior surface of the cylindrical structure (68) to which the mechanism (77) is to be applied and an outer surface defining a wall thickness. A reduced wall thickness (84a,b,c,d etc) is formed into the outer surface in a pattern to produce a discontinuity that interrupts the lengthwise coherence of vortex shedding of moving fluid from the outer surface when the cylindrical column is attached to the exterior of the cylindrical structure in the flowing fluid. The effect of VIV on the cylindrical structure (68) is effectively reduced.