Session: 09-01-04 Wind Energy: Aero-hydrodynamics 4

Paper Number: 126059

126059 - Hydrodynamic Characteristics of Heave Plates in Shallow Water Using Forced Oscillation 

Heave plates which are widely deployed at the bottom of floating offshore structures can effectively reduce the motion and improve the stability of structures by providing the additional added mass and damping. These hydrodynamic parameters are strongly affected by the proximity of solid boundaries in shallow water. In the present work, the variations of added mass and damping as the heave plates move a flat terrain and a stepped terrain are investigated. A column with a solid circular heave plate (similar to the offset column of DeepCwind platform) are simulated in a numerical wave tank which are built by a high-fidelity tool (Computational Fluid Dynamics, CFD) using forced oscillation tests in calm water. The added mass and damping coefficients of heave plate are determined by fitting time series of the calculated force and moment to Morison's equation with a least squares procedure. The hydrodynamic coefficients of heave plates with varying distance between heave plates and a flat terrain in shallow water are analyzed and compared with the estimated coefficients in deep water. Furthermore, the influence of the width and length of a stepped terrain on the hydrodynamic characteristics of heave plates are investigated with a constant distance between the top of terrain and the bottom of heave plate.   

Presenting Author: Haoran Li Hohai University

Presenting Author Biography: Haoran Li hold a B.S.E degree and M.S.E of Naval Architecture & Ocean Engineering in China University of Petroleum and Shanghai Jiao Tong Univesity. Then he got a PhD degree of Marine Technology in NTNU. Now he works as a lecturer in Hohai University. His current research focuses on the nonlinear hydrodynamics and dynamic responses of floating offshore wind turbines with heave plates and modelling of flexible platform of extra-large floating offshore wind turbines.

Authors:

Haoran Li Hohai University
Jinhai Zheng Hohai University
Jisheng Zhang Hohai University
Mi-An Xue Hohai University
Chen Yang Hohai University