Motion of a floating body in a harbour by domain decomposition method. (September 2018)

• Record Type: Journal Article
• Authors: Shi, Y.Y.; Li, Z.F.; Wu, G.X.
• Is Part Of: Applied ocean research. Volume 78(2018)
• Page Start: 223
• Page End: 240
• Publication Date: 2018-09
• Subjects: Ship motion in a harbour -- Domain decomposition -- Three-dimensional boundary element method -- Free-surface green function; Ocean engineering -- Periodicals; 620.416205
• DOI: 10.1016/j.apor.2018.06.015
• Languages: English
• ISSNs: 0141-1187

Abstract

Highlights: A three-dimensional domain decomposition method for interaction of wave with a body floating in a harbour is proposed. Comparison studies through a rectangular barge in a rectangular harbour have shown that the method is accurate. Highly oscillatory behaviour of the ship motion is observed and its mechanism is discussed. The effect of incident wave direction, ship location and harbour bottom topography are investigated in detail. Abstract: A three-dimensional domain decomposition method is used to solve the problem of wave interaction with a ship floating inside a harbour with arbitrary shape. The linearized velocity potential theory is adopted. The total fluid domain is divided into two sub-ones: one for the harbour and the other for the external open sea. Boundary integral equations together with the free surface Green function are used in the both domains. Matching conditions are imposed on the interface of the two sub-domains to ensure the velocity and pressure continuity. The advantage of the domain decomposition method over the single domain method is that it removes the coastal surface from the boundary integral equation. This subsequently removes the need for elements on the coastal wall when the equation is discretized. The accuracy of the method is demonstrated through convergence study and through the comparison with the published data. Extensive results through the hydrodynamic coefficients, wave exciting forces and ship motions are provided. Highly oscillatory behaviour is observed and its mechanism is discussed. Finally, the effects of incident wave direction, ship location as well as the harbour topography are investigated in detail.