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Podded drive systems are one the recent innovation in marine propulsion systems. Hydrodynamic analysis of this system is more complicated than conventional propeller-rudder systems. The different numerical methods have been used in the hydrodynamic analysis of podded drive systems. The range of these methods is from the potential method or potential/viscous approach to pure viscous methods. In this paper, we applied coupled approach in this regard. The main purpose of this research is developing a BEM/RANS coupled method for numerical simulation of podded drives. In the proposed Potential/Viscous coupled method, the flow around rotating part (propeller) is simulated by a BEM code. Then fixed parts (pod and strut) are modelled by a RANS solver. In RANS solver, the propeller can be substituted by a set of equivalent forces which called body force and added in the right hand of momentum equation. Two cycles are available for coupling the result between potential and viscous method. The coupled method is first studied and validated with a single propeller. Afterward, the propulsive performance of the podded drive systems is studied. The results include the propeller thrust coefficient, the propeller torque coefficient, and the axial force coefficient. The results obtained by coupled method are compared to and verified by the experimental data.

Keywords: Coupled Method, BEM Method, RANS Method, Podded drive System

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