Session: 06-01-02 Computational Mechanics and Design Applications II

Paper Number: 105066

105066 - Slamming Effects on Fpso Balconies: Numerical and Experimental Analysis of Alternative Configurations for Impact Attenuation 

Despite the complexity of the physical phenomena involved, slamming need to be analyzed for offshore structures. Ship type offshore platforms like FPSOs (Floating, Production Storage and Offloading) take slamming effects into consideration by traditional standard recommendations and safety factors.  However, FPSO may require additional deck area by using riser and mooring balconies and the slamming effects in such structures are not straightforward to be considered. This paper describes the analysis of a balcony structure that was found to be subjected to extreme impact loads and presents the numerical and experimental investigation of alternative configurations that may lead to impact loads attenuation. The alternatives include modifying the balcony bottom plate by using an inclined plate or prism structures, installation of cylindrical channels or fender like structures and perforations on the balcony structure itself. The numerical analysis was done by prescribed motion short duration CFD (Computational Fluid Dynamics) models and the experiments were carried out in USP (University of São Paulo) reduced scale ocean basin for the most severe sea states expected. The results presented as impact time series for CFD and as probability of exceedance from experiments demonstrate the most promising alternatives for design in order to avoid wave impact loads.

Presenting Author: Daniel Fonseca de Carvalho e Silva Petrobras

Presenting Author Biography: Mechanical Engineer graduated in 2003 by Rio de Janeiro Federal University (UFRJ) including one year under graduation coursed at Munich Technical University. Master of Science degree obtained in 2005 by the same university. In 2004, began in Petrobras as Equipment Engineer. Working since then at R&D center, developing R&D projects internally and in partnership with universities. In 2016 obtained the Doctor of Science degree at UFRJ. Since 2007 working on coordination of ocean engineering research projects and technical assistance to offshore operations. Current activities include CFD-analyses and ocean basin models tests for offshore systems. Since 2018 in the position of technical advisor in Petrobras.

Authors:

Daniel Fonseca de Carvalho e Silva Petrobras
Fabio Gouveia Telles de Menezes Petrobras
Dilnei Schmidt Petrobras
Pedro Cardozo de Mello University of São Paulo