The presence of appendages upstream of a propeller on a ship modifies its hydrodynamic performances: rotation speed, power, efficiency, cavitation and noise. Hence, it is ·necessary to improve our knowledge of the wake in order to improve propeller designs and propeller hull interactions. To this aim, the interaction between the wake of the hull and that of the appendages has been studied through experimental and numerical investigations. The experimental work concentrated on velocity measurements on a ship model as well as on a simplified shaft arrangement. The numerical work was focused on the validation of a Navier Stokes code for the same cases. The data obtained shows that there are significant Reynolds number effects on the flow in the wake due to the appendages. This effect is shown to be caused by the presence of the bossing and shaft which divert low speed hull boundary layer flow towards the propeller disk.

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