Abstract

This paper investigates the hydrodynamical aspects of a fixed FPSO in regular waves. The emphasis is geared to the validation of state of the art CFD techniques, using particle image velocimetry measurements on the water velocities around a captive model of an FPSO in regular waves. The main focus is on the following issues: 2 Determination of the water velocities around the vessel using PIV techniques and pressures on a girth below and just above the mean waterline of the vessel using pressure gauges. 2 Comparison of the RAO's of the water velocities, pressures and relative wave heights. The resulting pressure profiles along the girth, especially near the waterline, showed a significant non-linear effect in steep beam wave conditions. The velocities as measured near the bilges of the vessel indicated a strong separation at the bilge's of the vessel. This leads to an overestimation of the water velocities near the bilge's of the vessel as calculated using a linear diffraction programme.

INTRODUCTION

This paper presents the results of the experimental programme on the FPSO, ie-captive model tests for PIV measurements, extinction tests in waves for an EU project with acronym EXPROCFD. The experiments aim to perform measurements (flow data and hydromechanical data) on a FPSO and to deliver data for validation of state of the art CFD tools as e.g. reported by Graham et al [12], Visonneau et al [2]. The application of PIV has been studied e.g. with liquid sloshing in moving tanks over a long time. Historically, sloshing studies started with impact problems in LNG carrier tanks. Then, the developed numerical and experimental tools and methodologies have been applied to other industrial domains : aeronautics (Airbus A300 wing tank), aerospace (Ariane V oxygen tank), automotive transportation (tanker trucks, car tanks), food industry (milk tank).

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