Bottom slamming for a Very Large Floating Structure: Uncoupled global and slamming analyses

• Published in: Journal of fluids and structures Vol. 25; no. 2; pp. 406 - 419
• Main Authors: Greco, M., Colicchio, G., Faltinsen, O.M.
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier Ltd 01.02.2009; Elsevier
• Subjects: 2-D potential flow; Air cushion; Applied sciences; Buildings. Public works; Exact sciences and technology; Fluid dynamics; Fully nonlinear bottom slamming; Fundamental areas of phenomenology (including applications); General theory; Ground, air and sea transportation, marine construction; Hydraulic constructions; Linear-global behavior; Marine construction; Offshore structure (platforms, tanks, etc.); Physics; Solid mechanics; Structural and continuum mechanics; Uncoupled analysis; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); VLFS; 2-D potential flow; Uncoupled analysis; VLFS; Linear-global behavior; Air cushion; Fully nonlinear bottom slamming; Global analysis; Modeling; Potential flow; Scaling law; Hydroelasticity; Ship hull; Non linear effect; Floating body; Flow potential
• ISSN: 0889-9746; 1095-8622
• DOI: 10.1016/j.jfluidstructs.2008.09.002

The bottom slamming of a Very Large Floating Structure (VLFS) has been studied with theoretical and numerical tools. The strategies adopted are: (i) a linear analysis for modeling the global motions of the platform, followed by (ii) a fully nonlinear description for the bottom-slamming occurrence. Model (i) is used to examine the global behavior of a VLFS at model and full scales, and model (ii) is applied to investigate the bottom-slamming features in terms of flow evolution and induced pressure and stresses on the platform bottom. Excitation of hydroelastic coupling and occurrence of air cushion are also discussed together with the challenges connected with scaling effects.