COUPLING BETWEEN FLEXIBLE SHIP AND LIQUID SLOSHING USING POTENTIAL FLOW ANALYSIS AND ITS EFFECT ON WAVE-INDUCED LOADS

摘要

In this paper the potential flow approach adopted in previous investigations for the coupling effect between rigid body ship motion and sloshing is extended to the flexible ship-partially filled tank system, using the de-singularised Rankine source method. The unified method is verified by applying it to the sloshing in a partially filled rectangular tank with a flexible wall. The main aim of this paper is to investigate the influence of hull flexibility on the hydrodynamic forces and moments associated with liquid sloshing and the effect of sloshing on wave-induced responses. The coupling effect between flexible ship and sloshing is illustrated for an idealized LNG carrier in beam regular waves, considering different partial filling scenarios. Symmetric and antisymmetric responses, such as bending and torsional moments, in beam regular waves are investigated with and without coupling effect from liquid sloshing. From the limited numerical comparisons, it is found that liquid sloshing has an influence on the response of distortional as well as rigid modes, i.e. wave-induced motions and loads.