Numéro : 2554 - Year : 2009
Normal slamming tests on rigid cones
Alain NÊME, ENSIETA – EA 432 LBMS
Aboulghit EL MALKI ALAOUI, ENSIETA – EA 432 LBMS
The impact of bodies with a water surface often causes a large load with high temporary local pressure on the bodies. This slamming load can result some damage in the structures of ship hulls and marine facilities. In addition, the stress and strain history under swell as well as bow-slamming loading must be accurately evaluate at critical cross-sections (midship section basically) to avoid short fatigue life of the boat. Owing to its practical importance in marine engineering, the water body impact problem has attracted a large number of new investigations based on older experiments and analytical developments regarding seaplane design. CFD codes (FLUENT, ..) and ALE or CEL FEA (ABAQUS, LsDyna, ..) are powerful numerical tools for slamming simulations. Nevertheless, these complex computations need to be validated with experiments. In this paper, we report the results of our experimental investigation of the non-dimensional slamming coefficient f(beta) for a rigid cone entering initially calm water at constant velocity. Parameters such as the velocity (V) and three different deadrise angles (beta = 7°, 15° and 30°) are taking into account in this study. Comparisons between available numerical values and that experimental data of f(beta) show good agreements.
Advanced search
Year