Author(s)

K.B. Skaugset and C.M. Larsen

Abstract

Most of the latest years' research on vortex induced vibrations (VIV) of circular cylinders in water has been motivated by the offshore industry's need for reliable predictions of the behaviour of deep water risers and free span pipelines subjected to ocean current. An obvious approach to solve VIV problems is to introduce suppression devices such as helical strakes or fearings. Such devices may influence the vortex shedding process in two ways: 1) 2-dimensional (2-D) effects will influence the local forces on the cross section and damping by altering the separation point as well as creating a general disturbance to the flow. 2) 3-D effects include changes in correlation of the vortex shedding process along the span of the cylinder. It is well k

Keywords