Rankine time-domain method with application to side-by-side gap flow modeling

Autor(es)

Watai, R. A. ^[1] ; Dinoi, P. ^[2] ; Ruggeri, F. ^[1] ; Souto-Iglesias, A. ^[2] ; Simos, A. N. ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Dept Naval Architecture & Ocean Engn, Numer Offshore Tank TPN, Sao Paulo, SP - Brazil

^[2] Tech Univ Madrid, Naval Architecture Dept, Madrid - Spain

• Tipo de documento: Artigo Científico
• Fonte: APPLIED OCEAN RESEARCH; v. 50, p. 69-90, MAR 2015.
• Citações Web of Science: 16

Resumo

The performance of a time domain Rankine panel method applied to the seakeeping problem of two ships in side-by-side configuration is investigated in this article. Benchmark data for the numerical results are provided by fundamental seakeeping tests carried out in the towing tank of the CEHINAV-Technical University of Madrid. The multi-body system was composed by a barge and a prismatic geosim, which were subjected to regular head waves in two different gap distances. The motions of the geosim model were restricted to surge, heave and pitch, whereas the barge model was kept fixed. This set-up was adopted so as to guarantee that the gap width remained constant during the tests, providing a favorable situation for the numerical modeling of the system. Comparison between measurements and numerical results illustrates the limitation of potential flow solvers concerning the modeling of this hydrodynamic problem. Numerical wave resonance in the gap led to wave elevations and body motions much larger than those observed during the tests. In addition, the time domain method also presented convergence problems for a range of frequencies associated to the gap resonance phenomenon. In order to overcome these problems, an external damping factor was introduced in the time domain simulations, bringing a significant improvement to the numerical convergence of the method. Moreover, despite the simplicity of the damping model adopted, the results showed that this technique was indeed able to improve the computational predictions, leading to a closer agreement between the experiments and the numerical results. (C) 2014 Elsevier Ltd. All rights reserved. (AU)

• Processo FAPESP: 10/08778-2 - Método de elementos de contorno no domínio do tempo para análise de comportamento no mar de sistemas oceânicos
• Beneficiário: Rafael de Andrade Watai
• Modalidade de apoio: Bolsas no Brasil - Doutorado Direto
• Processo FAPESP: 12/06681-7 - Método Numérico para Análise da Dinâmica Não Linear de Sistemas Oceânicos sujeitos a ondas e correnteza.
• Beneficiário: Felipe Ruggeri
• Modalidade de apoio: Bolsas no Brasil - Doutorado