Investigation of Non-Linear Ship Hydroelasticity by CFD-FEM Coupling Method

With the increase of ship size, stiffness hull structure becomes smaller. This means that frequency wave excitation tends to be closer natural vibration, which in turn makes hydroelastic responses more significant. An accurate assessment loads and motion hulls is key design safety assessment. In this paper, coupled CFD (Computational Fluid Dynamics)-FEM (Finite Element Method) method used investigate non-linear hydroelasticity effect a 6750-TEU (Twenty-foot Equivalent Unit) container ship. First, by comparing heave, pitch, vertical bending moment at midship section (VBM4) against experimental results reported literature, validity numerical paper illustrated. Secondly, under different length–ship length ratio, frequency-structure frequency, steepness, speeds are studied. It found ratio has important influence on response than from non-linearity will behave differently ratio. The rigid body caused forward speed not correspondingly response.