| Full text | |
| Author(s): |
Watai, R. A.
;
Ruggeri, F.
;
Simos, A. N.
Total Authors: 3
|
| Document type: | Journal article |
| Source: | APPLIED OCEAN RESEARCH; v. 59, p. 93-114, SEP 2016. |
| Web of Science Citations: | 4 |
| Abstract | |
Many important offshore operations involve multiple vessels whose relative positions change considerably in the course of the operational procedures. When the action of sea waves on the dynamics of these vessels is concerned, an accurate modeling of the hydrodynamic problem is not an easy task. The use of frequency-domain panel codeS is compromised by the variations of the bodies' relative positions and may lead to inconsistent results. A time-domain approach is clearly more appropriate, but even in this case the representation of the moving bodies requires a re-meshing procedure and considerable computational efforts. This paper addresses the problem of wave interaction with multiple bodies with large relative displacement by integrating a re-meshing procedure to a time-domain Rankine panel code. The mathematical algorithms adopted for generating the new free-surface grids and performing the interpolation of wave elevation and velocity potential are described in detail. The paper also presents a set of dedicated captive model tests performed in a wave basin as a means of verifying the performance of the numerical method. Tests involved models with simple geometries that performed slow prescribed drift motions in the presence of incoming regular waves. Hydrodynamic forces were measured on one of the models and different levels of transient interaction effects could be reached by varying the frequency ratios between waves and body motions. The good performance of the method is then attested by directly comparing the hydrodynamic forces predicted by the computational code with those measured during the model tests. Moreover, it will be shown that the numerical model was able to capture some interesting Doppler effects that will be discussed together with other validation results. (C) 2016 Elsevier Ltd. All rights reserved. (AU) | |
| FAPESP's process: | 10/08778-2 - Time domain boundary elements method for seakeeping analysis of marine systems |
| Grantee: | Rafael de Andrade Watai |
| Support Opportunities: | Scholarships in Brazil - Doctorate (Direct) |
| FAPESP's process: | 12/06681-7 - A numerical method for non linear analysis of the dynamics of marine systems under gravity waves and current. |
| Grantee: | Felipe Ruggeri |
| Support Opportunities: | Scholarships in Brazil - Doctorate |