The tip vortex flow generated by a marine open propeller was numerically simulated for three different scales using a Reynolds Averaged Navier-Stokes (RANS) solver. The solutions of RANS were further improved by conducting a Direct Navier-Stokes Simulation (DNSS) in a reduced computational domain. This resulted in significant modifications of the minimum pressure coefficients along the tip vortex. These were analyzed and used to deduce a scaling law. Nuclei effects on the scaling law were investigated with the help of a surface-average pressure (SAP) spherical bubble dynamics model with a realistic bubble nuclei distribution. It was found that the Reynolds number power of the scaling law predicted based on the single phase flow solution is quite different from the classical value. However, the nuclei effects tend to adjust the power back to the classical value if the reference inception criterion is not stringent (higher number of events per second).
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