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Artist impression of the new SIGMA-class frigate with viscous-flow ReFRESCO calculations


towing tank’ for naval vessels D


Report interviews Oscar van Straten, an engineer


from Damen Schelde Naval Shipbuilding, Research & Technology Support,


about the impact of CFD and the long-lasting


relationship with MARIN.


amen Schelde Naval Shipbuilding (DSNS) is a Dutch naval shipyard with its roots dating back to


1875. Based in Vlissingen and specialised in complex commercial and naval vessels up to 200 m, DSNS supplies naval surface combatants and auxiliaries to the Royal Netherlands Navy and has carried out over 50 years of continuous frigate and auxiliary vessel development, which resulted in seven generations of frigates and four generations of auxiliary vessels. MARIN has worked with DSNS for decades with most of the model tests carried out at its facilities in Wageningen. And now increasingly, CFD is being used.


All of the Royal Netherlands Navy vessels have been tested at MARIN over the years as well as those for international navies such as the Indonesian and Royal Moroccan


6 report


For the SIGMA-Class development in 2002, CFD had already started to make its pres- ence felt. Mr van Straten comments: “DSNS has been involved with CFD for quite a long time as we became a licence holder of the potential flow code RAPID in 2000.”


Dutch and international navy test campaigns MARIN has carried out exten- sive model testing for SIGMA. The four corvettes for Indonesia are 91 m and then the three for Morocco have two different lengths, 98 m and 105 m. All have a 13 m


CFD – a future ‘numerical


Navy. For example, MARIN was involved in extensive model tests for four SIGMA-Class corvettes delivered to Indonesia in 2004 and then three more, which were length- ened versions, for the Royal Moroccan Navy. “Typically, we use MARIN to help us optimise our own designs, before the ships are sold.”


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