Hydroelastic analysis of slamming induced impact on stiff and flexible structures by two-way CFD-FEA coupling

Abstract

ABSTRACT In rough seas, ships may be subject to wave-induced slamming loads.Thus, modelling of fluid and structural mechanics, and their dynamic interactions can help with the evaluation of fluid actions and the prediction ofwave-induced loads for use in ship design. In this paper a partitioned two-way coupled CFD-FEA fluid–structure interaction (FSI) method is usedto study the water entry of flat plates with different impact velocities and wedges with different deadrise angles. Results show that when flexibleplate dynamics prevail, at relatively low to medium impact velocity a negative correlation between the nondimensional pressure and water entryvelocities is evident near plate centre areas. A steady correlation exists when only stiff plate dynamics prevail. Pressure differences between stiffand flexible wedges become evident at small deadrise angles. The similarity of the pressure distribution during water impingement of ideally stiffwedge structures is not valid when structural flexibility prevails.