Numerical Computation of the JBC with and without Energy Saving Device

In this paper results for the Japanese bulk carrier in different configurations and operative conditions are presented. Simulations have been pursued for both the bare hull and the configuration which includes an energy saving device in the form of a stern duct. Both propelled and towed operative conditions have been simulated. The model is fixed in even keel conditions, free surface have been not taken into account (double model simulations). The propeller has been taken into account either with a suitable model based on the actuator disk approach or in its actual geometry (full unsteady RANS computations). Simulations have been performed by means of the in-house developed code Xnavis. The solver is a finite volume second order accurate general purpose unsteady Reynolds averaged Navier Stokes solver. In the following, a brief overview of the solver is give, followed by the description of the numerical cases considered, including numerical parameters and the computational mesh. A brief overview of the results obtained, including the numerical simulations of the propeller in open water is then presented. Conclusions and future works wind up the paper.