Numerical Prediction of Cavitation Performance for Rim Driven Thruster


The open-water characteristics and cavitation behavior of a rim-driven thruster (RDT) are examined by using the Reynolds-averaged Navier-Stokes (RANS) method. The total thrust coefficients and torque coefficients calculated by RANS solver with the SST k-ω turbulence model show relatively better agreement with the experimental data than other two-equation turbulence models. The cavitation behavior of the RDT with a cavitation number of σn=3.0 in uniform and non-uniform flow are then separately explored by using the tow-phase RANS method with the SST k-ω turbulence model and the Schnerr-sauer cavitation model, as well as the sliding mesh technique. It can be observed that a sheet cavitation occurs on the suction side of the blades, occupying almost 35% blade area, and kind of cloudy structures are captured to be shed from the sheet cavity for the RDT in uniform flow. Whereas, the sheet cavitation is observed to take up more than 50% blade area for the RDT in a ‘Triple Peak’ wake field.

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Topics: Cavitation
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