This is the continuation of our research on development of a fully nonlinear, dynamically consistent, numerical ship motion\r\nmodel (DiSSEL). In this study we will report our results in predicting ship motions in unsteady maneuvering in calm water.\r\nDuring the unsteady maneuvering, both the rudder angle, and ship forward speed vary with time. Therefore, not only surge,\r\nsway, and yaw motions occur, but roll, pitch and heave motions will also occur even in calm water as heel, trim, and sinkage,\r\nrespectively. When the rudder angles and ship forward speed vary rapidly with time, the six degrees-of-freedom ship motions\r\nand their interactions become strong. To accurately predict the six degrees-of-freedom ship motions in unsteady maneuvering,\r\na universal method for arbitrary ship hull requires physics-based fully-nonlinear models for ship motion and for rudder forces\r\nand moments. The numerical simulations will be benchmarked by experimental data of the Pre-Contract DDG51 design and an\r\nExperimentalHull Form. The benchmarking shows a good agreement between numerical simulations by the enhancement DiSSEL\r\nand experimental data. No empirical parameterization is used, except for the influence of the propeller slipstream on the rudder,\r\nwhich is included using a flow acceleration factor.
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