This paper describes an ongoing effort to integrate Computational Fluid Dynamic methods into a system for predicting the performances of multi-component propulsors in a turbulent ship flow environment. These methods include a Reynolds-Averaged Navier-Stokes (RANS) code for ship turbulent flow calculations and a Vortex-Lattice Method (VLM) based program MPUF3A for sheet cavitating propeller flow analyses. The combination of these methods provides a new level of realism for modeling the flow field around a ship with thick turbulent boundary layers and multi-component propulsor/hull interaction. The bottlenecks caused by inadequate grid generation methods and a lack of code integration, which have prevented the use of these numerical methods for practical configurations in design time frame, have been substantially alleviated by the incorporation of zonal calculation techniques, advanced gridding tools, and a chimera gridding method that allows arbitrary grid block overlap.

Validations of the calculation method were performed for a contra-rotating propeller, CR404 system, and a series 60, CB = 0.6, ship hull with a MAU propeller. Comparisons of the computational results to the measurement data are documented in this paper. Also, to demonstrate the predictive capability of the method, simulations were carried out for the series 60 ship hull with a single propeller and a contrarotating propeller under model and full scale conditions.

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