The ship powering performance can be predicted based on model tests or simulations. However, differences exist between the full-scale ship performance and extrapolated model data. Therefore, research on full-scale ship performance simulation has important scientific significance and engineering value. This study used the REGAL general cargo vessel to perform full-scale ship resistance and self-propulsion simulations for various grid numbers, time step sizes, and wall Y+ values and compared the calculation and empirical results. The resistance components, waveform, Courant–Friedrichs Lewy (CFL) number, pressure field, and wake flow field of various resistance simulation conditions were analysed. The wall Y+ value was observed to affect the capture of boundary layer flow, ship pressure field evolution, and waveform, which subsequently affect the ship resistance. A Y+ value within 200 was considered to be appropriate when simulating the powering performance of a full-scale ship. The waveform evolution was significantly affected by the time step size, which should meet the requirement that the CFL number on the free surface is less than 1. When simulating the self-propulsion of a full-scale ship based on sliding mesh, the CFL number on the interface should also be less than 1. Additionally, to obtain the correct propeller excitation force, it was recommended that the time step size be maintained below 1°/step (0.000076 L_PP/v).

船舶动力性能可以基于模型测试或模拟进行预测。然而，全尺寸船舶性能和外推模型数据之间存在差异。因此，开展全尺寸船舶性能仿真研究具有重要的科学意义和工程价值。本研究使用 REGAL 杂货船对各种网格数、时间步长和壁面 Y+ 值进行全尺寸船舶阻力和自航模拟，并比较计算和经验结果。电阻分量、波形、Courant–Friedrichs Lewy ( CFL) 数、压力场和尾流流场的各种阻力模拟条件进行了分析。观察到壁 Y+ 值会影响边界层流的捕获、船舶压力场演变和波形，进而影响船舶阻力。在模拟全尺寸船舶的动力性能时，Y+ 值在 200 以内被认为是合适的。波形演化受时间步长影响较大，应满足自由面上CFL数小于1的要求。 基于滑动网格模拟全尺寸船舶自航时，CFL界面上的数字也应小于 1。此外，为了获得正确的螺旋桨激振力，建议将时间步长保持在 1°/步以下 (0.000076 L _PP /v )。