Discrete element method simulation of a split hopper dredger discharging process

Bašić, Josip and Ban, Dario and Degiuli, Nastia and Govender, Nicolin (2017) Discrete element method simulation of a split hopper dredger discharging process. = Discrete element method simulation of a split hopper dredger discharging process. In: VII International Conference on Computational Methods in Marine Engineering MARINE 2017, 15-17.05.2017., Nantes, Francuska.

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Abstract

Split Trailing Suction Hopper Dredgers (Split TSHD) have longitudinally-split hull, which symmetrically opens when executing gravity-driven unloading of the cargo, while being exposed to various environmental conditions. Even though they have variable hull geometry, their hydrostatic and stability characteristics are usually calculated for initial and unchanged loading conditions only, which is a requirement imposed by a classification society stability regulation for TSHD ships [2, 3, 4]. In order to investigate the significance of the discharge process dynamics on actual ship stability, Discrete Element Method (DEM) unsteady numerical simulations were performed for symmetrical hopper opening during cargo discharge procedure, without the hull opening failure modes examined. Ship hydrostatic properties, which are precalculated analytically using Radial Basis Functions (RBF) for all possible states [11], are used in combination with the solver in order to compute righting moment and righting arm, which are affected by the dynamics of the cargo and the loss of displacement. The dynamics of the cargo discharge process was simulated with a DEM solver implemented for Graphics Processing Units (GPU), Blaze-DEMGPU [8]. Spherical shapes of particulate elements were employed to model soil cargo, with both cohesion and buoyancy effects included for the wetted elements. Simulations of discharging were performed for various loading conditions. Numerical simulations indicate that the dynamics of cargo during its discharge process should not be ignored due to its effect on transverse stability of the ship. Hence, an incoming wave and other environmental loads in combination to a hull side opening failure during the discharge could lead to inapt unstable situation of a ship. Nonsymmetrical Split TSHD ship openings will be examined in future work, with an investigation of its influence on ship stability and safety of cargo discharge procedures in failure modes.

Item Type: Conference or Workshop Item (Lecture)
Keywords (Croatian): Discrete Element Method, Radial Basis Function, Polynomial RBF, Ship Stability
Subjects: TECHNICAL SCIENCE > Shipbuilding
Divisions: 600 Department of Naval Engineering and Marine Technology > 610 Chair of Hydromechanics of Marine Structures
Indexed in Web of Science: No
Indexed in Current Contents: No
Date Deposited: 02 Oct 2017 15:19
Last Modified: 02 Oct 2017 15:19
URI: http://repozitorij.fsb.hr/id/eprint/8054

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