| Résumé | Some interesting hydrodynamics arise when a Landing Platform Dock ship with a partially flooded well deck is subjected to waves. The motion of the ship induces sloshing in the contained fluid, which in turn generates forces that affect the motion of the ship. If the fluid is only partially contained then energy can also be transferred from the external waves to the fluid inside the ship. This paper describes the development of the software tools required to simulate wave action in a flooded well deck, using the integration of a commercial CFD code with a ship motions code. Three levels of integration were considered. The most complex integration involved the full coupling of the CFD code with the ship motions code, so that ship motions, fluid motions and fluid forces are calculated at each time step. The problem can be simplified if it is assumed that the waves are small, and do not induce motion of the ship. Finally the problem can be further simplified if it is assumed that the waves are generated at the entrance to the well deck, and only internal flow is considered. Each simplification reduces the omputational time significantly, but is only valid if there is a small effect on the results. This paper shows that for head waves, in wave heights and periods typical of operating conditions for LPDs, there were no significant errors introduced by the simplifications, when compared to available model data. The paper then explores how wave height within the well deck is affected by well deck geometry. |
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