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MAROFF-2-Maritim virksomhet og offsh-2

Ship Propulsion in Extreme Seas

Tildelt: kr 12,1 mill.

Design of ships and propulsion systems are currently based on analyses of the performance in calm water. The effects of waves and ship motions are mainly taken into account using crude safety factors. Increasing fuel costs, introduction of novel ship desi gns and propulsion systems, together with the strict safety requirements and increasingly demanding marine operations to be performed in the northern seas means that this is no longer sufficient. Scientifically sound methods to find loads and responses re lated to operation in heavy seas need to be established. SeaPro focuses on four areas: 1. Propulsion dynamics in waves 2. Propellers operating in extreme off-design conditions 3. Added resistance and speed loss of ships in heavy seas 4. Use of viscous fl ow solvers in seakeeping Propulsion dynamics in waves is about prediction of dynamic forces of propellers and thrusters in extreme seas. FPSOs and other types of offshore vessels have experienced downtime and operational problems due to failure of propuls ion units, which again is due to dynamic loads in waves. The aim of the activity is to be able to understandthe physics and predict the loads. Propellers operating in extreme off-design conditions is a mainly experimental study of the flow and forces on p ropellers in conditions, like bollard and crash-back. Accurate prediction of these forces is crucial for dimensioning of propeller blades. The study is performed in co-operation with Chalmers, who is going to study this with CFD. Added resistance and spee d loss in heavy seas aims at the development of methods to predict the added resistance and speed loss in waves of ships. The speed loss is important for fuel consumption and for regularity in service. Reynolds-Averaged Navier-Stokes (RANS) computational fluid dynamics (CFD) is increasingly used in ship hydrodynamics. As computer power is increased, it becomes possible to study also seakeeping problems with these methods.

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MAROFF-2-Maritim virksomhet og offsh-2