It is believed that the use and development of marine resources will be promoted in the future in Japan and also needs of drilling risers will grow. One of the concerns for riser is Vortex Induced Vibration (hereinafter referred to as VIV). The assumed usage area of a riser tube includes seas where the marine/tidal current is strong. In this case, the Reynolds number is higher, which differs from the hydrodynamic force characteristics considered in conventional VIV design. Additionally , much of conventional researches focused on cross flow directional vibration, and the effect of inline directional vibration was not considered. This paper describes Mitsubishi Heavy Industries, Ltd.'s (MHI) efforts in these issues.
