Simulation on hull of a recreational boat. Complementary simulations at different trims and with different lowercase geometry.

This report describes some complementary results obtained in the framework of the Job Order 27-MAR-2017: "Simulation on hull of a recreational boat". Numerical simulations of the flow around the INSEAN model C2596 are performed in order to complete the results already described in the three previous reports. Simulations 1-3 use the same geometries as in reports [1, 2] but with different trims, equal to those of the corresponding towing tank experiments (in fact, in previous reports slightly different trims were used). For simulation 4, the geometry is the same as in [2] but with a finer mesh around the transom. This was done in order to assess the influence of the cells size on the wetted area of the transom (and, hence, on the resistance). Simulation 5 differs from the corresponding simulation reported in [3] only for the addition of an ogive to the lowercase. The reason behind this test is to assess whether a more gradual pressure recovery behind the hub would change the negative resistance (that is, a thrust) contribution to the lowercase resistance found with the flat hub. As in the previous reports, results are shown in terms of total resistance, specifying the hull and lowercase contributions. Pressure distributions on the surfaces of hull and lowercase are also shown. Some flow field visualizations are presented as slices of the three-dimensional flow field.