Numerical Simulation of the Flow Past a Rotating Propeller behind a Hull

Aim of this work is the analysis of the flow in the stern region of a fully appended twin-screw hull by an URANSE simulation. The numerical tool consists of a finite volume code, where the convective terms are integrated by a third-order algorithm that, introducing a very small numerical diffusivity, permits to follow the evolution of the tip vortices and their interaction with the rudder. The movement of the propeller is resolved by a dynamic overlapping grids method. The numerical data are first verified and validated by comparison with measurements and then exploited in order to get a deep insight of both the velocity field and the pressure oscillation on the stern vault.