Reynolds Averaged Navier-Stokes (RANS)-based Computational Fluid Dynamics (CFD) simulations are conducted using an in-house CFD framework, NavyFOAM, to predict the maneuvering performance of a trimaran propelled by three waterjets. The waterjet inlet and duct geometry are explicitly included as part of the overall model geometry in the simulations, and a body force model is used to represent the waterjet pump. Since explicitly modeling the deflection of the steering nozzles requires a dynamic overset grid approach, which is computationally expensive, the steering nozzle geometry is excluded in this study. Instead, integral momentum theorem is employed to model the effect of nozzle deflections during maneuvers. Two trimaran side hull configurations are considered in this study and effect of the side hull position on the performance of the ship is analyzed for zig-zag and turning circle maneuvers at several speeds. CFD results are compared against free running model test data. CFD results are shown to capture the trends associated with changes in side hull position and speed observed in experiments. Some discrepancies in absolute value of the maneuvering response prediction between the CFD and experiment are observed, and discussion of the sources of these differences is provided.

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