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naval architects can work together. There are many synergies between MARIN and the navy, he adds.
Currently, the two organisations are work- ing on several surface ship and submarine projects. Eelco Harmsen, the point of contact between the DMO and MARIN for surface ships, says that essentially the combination provides a knowledge centre, a centre of excellence in the Netherlands.
Due to the fact that the DMO can provide feedback for MARIN from full-scale trials this also helps further development. Dutch frigates for instance, are perhaps the quietest in the world, he points out, especially from the propeller point of view.
Propulsive research At the moment several navies are working on R&D for advanced propulsion designs for surface combatants, particularly focusing
on cavitation and propeller noise during combat operations. “Now we are trying to find a more tolerant design when the sea conditions are changing, taking into account ships’ motions and dynamics.”
MARIN and DMO started on the propulsive research years ago, looking at different combinations - conventional shafts, pods and waterjets. The research is currently focusing on waterjets and understanding the physics. “This involves looking at it in a completely new way and this is new for MARIN as well,” he says. “It is a learning curve for both of us.” A combina- tion of model testing and CFD calculations are being used and the navy and MARIN are exploring the benefits of CFD calcula- tions in the initial design process. Research is expected to take at least another six years.
The DMO stresses that it is important for MARIN to have both a knowledgeable and critical client. It can then give MARIN feed- back as soon as possible when testing is underway, especially with seakeeping trials. This means the validation process is speeded up and it is possible to see which seakeeping and manoeuvring criteria affect the mission.
Submarines Another important area where the two organisations team-up concerns submarine technology. Pieter van Coevorden, who heads up projects for subsea technology, says currently they are addressing the changing operational profile of the submarine. “Submarines were designed for open oceans but they are now being deployed close to the shore.”
Model testing is being carried out at MARIN for submarines that travel near to the sea- bed and examining how this close proximity affects the manoeuvring characteristics. The end-goal is to develop a simulation code that could formulate predictions which could then be used by submariners to give them operational guidance. Here, the navy pro- vides guidance from its submarine service so the feedback can steer the research.
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