Full-scale numerical simulations are crucial in ship hydrodynamics, eliminating the need for extrapolation of model scale results and offering at the same time accurate insights into complex flow dynamics. In this study, numerical simulations of the resistance and self-propulsion tests were performed for the Japan Bulk Carrier at full scale. The numerical model was based on Reynolds averaged Navier-Stokes equations with the finite volume method for discretization, the volume of fluid method for free surface tracking, and the body force propeller method to simulate the propeller effects. To ensure the reliability of the numerical results, uncertainties related to grid size and time step were assessed in the verification study. Validation was performed by comparing the numerical results with extrapolated experimental data, achieving satisfactory agreement.