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FANS Simulation of Propeller Wash at Navy Harbors (ESTEP Project ER-201031)

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Technical Report

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Space and Naval Warfare Systems Center Pacific San Diego United States

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Propeller wash induces high shear stresses on seafloor which may cause sediment resuspension in Department of Defense DoD harbors. To improve understanding of the sediment erosion, transport, dispersion, and re-deposition processes, it is desirable that advanced computational fluid dynamics models should be used to provide detailed resolution of the velocities and bottom shear stresses induced by the propeller wash in confined shallow water basins. In this study, the Finite-Analytic NavierStokes code was employed to solve the Reynolds-Averaged NavierStokes equations in conjunction with advanced near-wall turbulence model for several propeller-wash scenarios involving an Arleigh Burke-class destroyer with twin-screw propellers and a tugboat with two ducted propellers. This model enables us to evaluate the effect of water depth, ship speed, propeller rotating speed, and pier wall configuration on the propeller-induced shear stresses distributions.

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