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WINDLASS JIP: a better grip on high windage vessels


Container ships, cruise vessels and LNG carriers feature increasingly large windage and have to navigate into ports through waterways and locks, and finally berth safely at terminals which are exposed to severe wind. Recent incidents indicate that limiting wind conditions are reached earlier than in the past. On May 22 the WINDLASS Joint Industry Project was launched. Henk van den Boom, h.v.d.boom@marin.nl


Normally the wind is forecasted based on a reference height of 10 m. Large windage ships however encounter much stronger winds at 30 and 40 m height, as well as variations over their length. This can result in high drift angles, large berthing loads and extreme mooring line loads.


The Wind loads and Securing Ships (WINDLASS) Joint Industry Project has been initiated by MARIN, KRVE, Eindhoven University of Technology and WHIFFLE to investigate the 3D wind field encountered by large vessels in ports, waterways and locks to quantify the wind loads and consequences.


The JIP will deploy new technologies for a better understanding of 3D wind consisting of: • Lidar scanning for the remote measurement of 3D wind over the vessel area


• Finecasting; Large eddy simulation of 3D wind in the port accounting for global weather conditions


These measurements and computations will be conducted for selected locations in four participating ports and will also include mooring line tension monitoring.


The WINDLASS laptop tool for operational use in ports will be developed to predict the wind loads on high windage vessels. For this purpose the existing WINDOS


program will be used, facilitating a so-called “building block” approach. Additionally, the resulting drift angles, path width, berthing loads and mooring line tensions will be computed. Before delivery to all the JIP participants, the tool will be verified.


WINDLASS is conducted in close cooperation with port authorities, terminal and vessel operators, pilots, shipyards, engineering contractors and R&D institutes. More than 20 companies including the Port of Rotterdam and Hamburg Port Authority attended the kick-off meeting. The project will run for three years and is still open to new participants. To receive more information including the full proposal see www.marin.nl/jips/windlass.


Wind prediction by Finecasting


report 21


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