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Note: RANS

Abstract: In early 2008 FSG has started to design a 142m long RoRo-vessel intended to operate in the Irish sea. Restrictions from the ports of call (LOA=142m, T=5.2m) and a desired design speed of 21kn required an unusual design for the four deck RoRo-Vessel. The Froude-Number FN of about 0.3 is unusually high for a cargo vessel especially as the block coefficient is rather high (cB about 0.6). In order to fulfil the customers requirements the partner have used both potential flow and RANS-CFD-methods. The hull form has been optimised for low resistance and good sea keeping with the help of potential flow codes. In addition RANS-CFD-computations have been performed to estimate the ship’s wake field before the model tests. In order to achieve low induced pressure pulses and an acceptable propeller cavitation pattern, several shaft line designs have been tested in the numerical towing tank to optimise the wake field. The wake field has also been computed in various manoeuvring conditions. The results achieved from the CFD-computations are presented and compared to model tests performed for the vessel as far as possible.