Department of Geomatics Engineering,Farab Co.
Department of Marine Technology,Bangladesh University of Engineering & Technology, BUET
This paper presents the eect of current forces on the motion of forces on Floating
Production Storage and Ooading (FPSO) in irregular waves. The objective of this research is to compute
the motion of FPSO in irregular waves by time domain simulation including the eect of current forces.
A study is made on the slowly varying oscillations of a moored single body system in a current and waves.
Linear potential theory is used to describe the
uid motion, and three-dimensional source distribution
techniques are applied to obtain the hydrodynamic forces and transfer function of the wave exciting forces.
OCIMF (1994) data are used for estimation of the current forces. The non-linear time domain simulations
have been carried out in irregular waves. Based on it, slowly varying motion responses are examined
including the eect of the current forces. Several environmental conditions, such as the current angle
of attack, current velocity, signicant wave height and mean wave period are considered, which may
signicantly aect FPSO motion in surge, sway and yaw moments. It is found that the eect of current
forces is quite signicant when the current velocity is increased. In this simulation, while the current
velocity is increased to 3.0 meter/seconds, the impact on FPSO motion is quite signicant, which should
be taken into consideration from the point of view of safety, failure of mooring systems, operating responses
and the dynamic positioning of the FPSO.