A numerical tool for the frequency domain simulation of large arrays of identical floating bodies in waves
File(s)
Accepted version
Author(s)
Flavia, F Fabregas
McNatt, C
Rongere, F
Babarit, A
Clement, AH
Type
Journal Article
Abstract
The finite-depth interaction theory (IT) introduced by Kagemoto H. and Yue (1986) enables one to drastically speed up the computation of the added mass, damping and excitation force coefficients of a group (”farm”) of floating bodies when compared to direct calculations with standard widely available boundary element method (BEM) codes. An essential part of the theory is the calculation of two hydrodynamic operators, which characterize the way a body diffracts and radiates waves, known as Diffraction Transfer Matrix (DTM) and Radiation Characteristics (RC) respectively. Two different strategies to compute them for arbitrary geometries have been proposed in the literature (Goo, J.-S. and Yoshida, 1990; McNatt J. C. et al., 2015). The purpose of this study is to present the implementation of the former in the zeroth-order BEM solver NEMOH and to compare it with the latter by providing an insight into the DTM and the RC of a truncated vertical circular cylinder and a square box. A very good agreement between the hydrodynamic operators computed with both methodologies is obtained. In addition, hydrodynamic coefficients generated by means of the IT are verified against direct NEMOH calculations for two different array layouts. Results show the effect of hydrodynamic interactions as well as the importance of the evanescent modes truncation for closely spaced configurations.
Date Issued
2018-01-15
Date Acceptance
2017-11-09
Citation
Ocean Engineering, 2018, 148, pp.299-311
ISSN
0029-8018
Publisher
Elsevier
Start Page
299
End Page
311
Journal / Book Title
Ocean Engineering
Volume
148
Copyright Statement
© 2018 Elsevier Ltd. All rights reserved. This manuscript is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International Licence http://creativecommons.org/licenses/by-nc-nd/4.0/
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000424175900024&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Technology
Physical Sciences
Engineering, Marine
Engineering, Civil
Engineering, Ocean
Oceanography
Engineering
BEM
Interaction theory
Diffraction transfer matrix
Radiation characteristics
Wave farms
HYDRODYNAMIC INTERACTIONS
WATER-WAVES
CYLINDERS
DIFFRACTION
ABSORPTION
SCATTERING
FORCES
MATRIX
NUMBER
POWER
Publication Status
Published
Date Publish Online
2017-11-22