Sea Technology

FEB 2018

The industry's recognized authority for design, engineering and application of equipment and services in the global ocean community

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Page 42 of 52

42 ST | February 2018 CFD Methodology for Slim Vessel Regulation Testing For the past two years, Damen has been working on a CFD-based research project called "Gone With The Wind" (GWTW) to study the ca- pability of CFD to accurately mod- el the aerodynamic forces that act upon vessels above the waterline. The specific issue being addressed has been the challenge of meeting the requirements of the IMO regula- tion 749.18. Its objective is to ensure that vessels have sufficient transver- sal stability to resist over-rolling in severe side winds. It is difficult for long, slender vessels to satisfy the empirical requirements of the rule without undertaking extensive and costly experimentation. This has a direct impact on the time needed and the cost of gain- ing certification for vessels such as Damen's monohull fast crew sup- pliers (FCS) and their variants. Typi- cally, data have to be gathered from physical assessments using scale models in towing tanks and wind tunnels. The objective of GWTW has been to develop a CFD method- ology to replace the physical assess- ments for vessels such as Damen's FCS range that will demonstrate compliance to the satisfaction of the classification societies. Damen has been developing the CFD methodology in partnership with Numeca while conducting the physical tests needed to validate and verify the CFD calculations, us- ing a 1:18 scale model of Damen's FCS 3307. Work is now underway to adapt this methodology to full- scale prediction. SeaBat Sonar for Greenland Seabed, Marine Mapping The Greenland Climate Research Centre will take delivery of a Tele- dyne RESON SeaBat T50-R Extend- ed Range high-resolution multi- beam sonar early 2018. The sonar will be hull mounted on RV Sanna, a research vessel operating on the west Greenland coast. Researchers will utilize the sonar to map seabed topography and marine habitats in the 200- to 800-m deep waters of the Greenland Shelf. Citizen Science Aids Global Shark Research Vital scientific information about whale shark behavior, biology and ecology is being uncovered by eco- tourists and other citizens. Whale shark habitat spans the globe, making long-term research over wide geographic ranges a chal- lenge for whale shark researchers. Researchers have harnessed mod- ern technology to create an online photo database called "Wildbook for Whale Sharks" and enlisted the help of ecotourists and citizens across the globe to upload any im- ages of whale sharks they happened to see anywhere in the world. Pho- tos of nearly 30,000 encounters Operational Clarity. Instant Confidence. Visualising the Future of Sound through the 4th Generation of Live, Real-Time 3D Volumetric Imaging Sonars. The Echoscope 4G® Surface produces real-time, 3D, high definition visualisation and mapping visualisation and mapping for increased project efficiency and safety. Your Underwater Eyes See moving objects with our smallest and lightest sonar yet ocean research

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