Unified Approach to Ship Seakeeping and Maneuvering by a RANSE Method

In this work, a computational procedure for the prediction o f motion of rigid bodies floating in viscous fluids and subjected to currents and waves is presented. The procedure is based on a coupled iterative solution of the equations of mot ion f a rigid body with up to six Degrees Of Freedom (DOF) and the Reynolds-Averaged NavierStokes Equations (RANSE) describing the turbulent fluid flow. The fluid flow is analyzed u sing a commercial CFD package (Comet) which can use moving grids made of arbitrary polyhedral cells and allows sliding interfaces between fixed and moving grid blocks. The computation of body motion is coupled to the CFD code via user-coding interfaces on the b asis of each iteration. A fullyimplicit predictor-corrector procedure is employed for th e calculation of body motion, taking advantage of the iterative nature of the fluid-flow solver. The method is used to compute the motion of floating bodies/sh ips subjected to waves, showing favorable agreement with experiments. Extension t o more complex ship maneuvering applications is further conducted, which requires m odeling of interaction of ship, its rudder(s) and its propeller(s). With the ship hull and the ru dder modeled geometrically and the propeller simulated by a body force model, turning circl e and Zigzag maneuvers are performed as examples and the comparison with measurements show promising agreement.

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