Future developments and challenges with regard to type of ship, speed, performance and in relation to the present economic situation are likely to see STX Europe and MARIN work together in the future.
combined with skilled model basin staff, he says. “For a prototype builder, a mistake in the pre-project stage can be catastrophic. MARIN has a very open mind and offers con- structive advice on diverse subjects in order to find the best solution.”
He gives the example of the Color Line Fantasy Cruise Ferry where model and full- scale results were combined. “Open mind- edness and good co-operation between the shipyard, consultants, classification society, model basin, propeller maker and client were important in successfully achieving the highest possible comfort class level. In this example full-scale results were used effectively in model test scaling in order to achieve an impressive result, much better than earlier achieved comfort levels.”
Raimo adds: “When different manoeuvring devices are considered at the project stage, extensive experiences and good general know-how, with the main dimensions’ effects are very important to steer the project in the correct direction.” In addition, the Bow Flare Estimator is a good general indicator when it comes to bow-slamming behaviour in the concept stage of the project but later on, seakeeping research is needed to accurately examine seakeeping behaviour.
Simulation work vital Typical issues currently include green water, bow and aft impacts, accelerations, speed loss, springing,
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swinging and CFD capabilities, he says. CFD enables the project to progress quickly without many time-consuming modifications and extra tests. CFD calculations make it possible to limit the amount of model tests and they give a good 3D view of the flow behaviour around the hull and appendages. With CFD, it is now possible to optimise even smaller details in appendages and openings than it was previously to reach better cavitation, less erosion and more economical solutions.
In the huge cruise liner sector MARIN’s simulation work is also playing a very important role, he says. “The crew learn to understand the limitations and ship’s behaviour for various ports in different channels and shallow water effects etc.”
Ways to improve the economy of the ships and energy-saving devices are subjects continually being examined. More environ- mentally-friendly ships are being asked for but at the same time, they should have high comfort classes, he stresses. For more than 15 years, STX Europe has carried out con- tinuous full-scale measurements in deliv- ered newbuilding ships in order to under- stand the operational aspects better and to get direct, full-scale feedback. Full-scale re- sults are the most important information source for prototype builders when continu- ous development work is done. New emis- sion requirements are also affecting a lot of machinery and fuel selections.
As shown here, STX Europe has had a long relationship with MARIN. Many shipyard references are based on MARIN’s predic- tions. “The most important reason to use MARIN is the reliability of predictions, big surprises are not good for tight project schedules. Quality, service and speed are combined with a new, modern facility. The most important requirement for STX Europe is quality, next is the ability to keep on schedule.”
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