Numerical simulations of the hydrodynamic performance of the propeller with wake equalizing duct behind the ship

The equalizing wake ow into the propeller behind the ship is important from the hydrodynamic performance viewpoint. In this study, numerical simulations of the DTMB4119 propeller with two symmetric and asymmetric duct types behind the KRISO Container Ship (KCS) are performed using Computational Fluid Dynamics (CFD). In order to improve the wake equaling ow, a combined duct and stators configurations are installed before the propeller in the stern of the ship and its hydrodynamic performance is studied using CFD. A duct with the NACA4415 section and two types of stator configurations are selected. The STAR-CCM+ software using the finite volume discretization method was used to solve the governing equations of the uid ow. For simulating the turbulence model, the standard k-! model was used and the solution method was validated in comparison with the available experimental data. Output parameters including thrust coe cient and torque coeffcient in the open-water condition and behind the ship are presented and discussed. The propeller performance after mounting the asymmetric and symmetric ducts are improved by 4.8% and 6.57%, respectively. Therefore, it is concluded that the symmetric duct is more affected by the propeller performance and, hence, fuel consumption is reduced considerably.