engleski

Linear springing model - comparisons of different numerical models

This study presents comparisons among different numerical approaches for ship hydroelasticity problem, particularly focusing on linear springing phenomenon. Both Rankine-panel based time domain approach and wave-Green-function based frequency domain approach are cross compared with each other. For the time-domain approach, a higher-order Rankine panel method is used for the fluid motion around flexible seagoing vessel. The motion of flexible hull is represented by Vlasov-beam based finite element method, and motion equation is solved by Newmark-β method. For the frequency-domain approach, wave Green function method is employed in seeking hydrodynamic forces acting on the body in consideration, and the motion of flexible body is solved by using finite element method as well. Solution of the motion equation is sought by modal decomposition method, where unknown deformation field is expanded by superimposing its mode shapes including six rigid body ones. Comparison between the two solutions is made on both flexible stationary barge model as well as modern merchant ship model. Based on the present comparative study, the pros and cons of each method are discussed.

hydroelasticity; springing; Rankine-panel; wave Green function; Vlasov

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