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Research on predicting methods of propeller-hull interactions in head waves

机译：Research on predicting methods of propeller-hull interactions in head waves

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Predicting the added power of a ship in waves is critical to estimate the Energy Efficiency Design Index (EEDI). In this work, the Reynolds averaged Navier-Stokes (RANS) solver with the shear stress transport (SST) k-omega turbu-lence model is employed in the Computational Fluid Dynamics (CFD) to simulate propeller-hull interactions in waves. Two direct methods (the discretized propeller method and the body force method) and one indirect method (ITTC's Resistance & Thrust Identify Method) are employed to forecast the added power in head waves. The precision of simulation is validated by comparison with the experimental data. Specifically, the improved principle of momentum conservation for solving the advance speed of the virtual disk is put forward in the body force method, enabling the advance speed to be accurately calculated in real time. Compared with the discretized propeller method, the body force method has both accuracy and efficiency, which can be well applied to simulate the added power in waves. In the results, the wake fractions and the thrust deduction fractions in waves are smaller than those in still water, and they could vary by more than 10%. The ITTC's Resistance & Thrust Identify Method (RTIM) could overestimate the added power in waves. In head waves, the contributions of the added resistance and the added propulsion efficiency to the added power are greater than 70% and less than 30%, respectively. Furthermore, the self-propulsion factors and flow fields in waves are analyzed in detail, which are critical for predicting the added power in waves as well as for the design of energy-saving ships and propellers considering real sea conditions.

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