Experimental and Numerical Study of the Behaviour and Flow Kinematics of the Formation of Green Water on a Rectangular Structure

Abstract

SummaryIn this study, the behaviour of green water impacting on a fixed rectangular structure is studied, and the flow kinematics is investigated with a series of experiments and computational fluid dynamic simulations. The experiments are conducted in a two-dimensional wave flume with the structure under regular wave conditions that are scaled down by the ratio of 1:125 from the BW Pioneer FPSO (Floating production storage and offloading) operated in the Gulf of Mexico. The mean values of the horizontal and vertical velocity profiles are provided for the water and bubbly flow induced by the interaction between the rectangular structure and regular waves. CFD simulations are also performed by STAR-CCM+ using the volume-of-fluid (VOF) method based on the finite-volume method (FVM) and all of CFD results are compared with the experimental data.

Design of Breakwaters to Minimize Greenwater Loading on Bow Structures of Fixed Floating Vessels

“…The Volume of Fluid (VOF) techniques, on the other hand, has been used by several researchers to evaluate the effects of greenwater loading with success to some extent, as compared with the experimental findings [13]. Among some recent studies, the behaviour of greenwater impacting on a fixed rectangular structure is studied by Lee et al [14], and the flow kinematics is investigated with a series of experiments and computational fluid dynamic simulations. Chen et al [15] assessed the Greenwater overtopping onto fixed ship-shaped FPSO models using three dimensional (3-D) Computational Fluid Dynamics (CFD) simulations.…”

Study on PIV-Based Pressure Estimation Method of Wave Loading under a Fixed Deck

“…PIV can be used to measure the position of particles in a fluid through optical image measurement without disturbing the flow, and to measure the velocity over the entire flow in the field of view at the same time. It is also used for high-precision verification of computational fluid dynamics (CFD) simulation, since it can provide the characteristics of the velocity field (Nila et al, 2013;Lee et al, 2016;Kim et al, 2019;Kim et al, 2020). This PIV-based velocity field measurement method can apply the Froude similarity to velocity, and can estimate the pressure field rather than the local pressure at the same time; thus, it is expanding its application range as an experimental pressure estimation method.…”