Predictive simulation is, however, only one dimension of the challenge in achieving a final solution. Geotechnical, hydrodynamic and environmental conditions have to match a given WTIV’s structural capabilities.” Deeper water also causes vessels to behave differently versus shallow water. “Harder soil generates more impact than soft soil, while stronger winds and higher waves can exaggerate impact events. “The developed numerical model incorporates vessel heading, weather and soil conditions, as well as the strength of the WTIV, to potentially expand the weather window where the WTIV can be safely installed,” says JIP project manager Antonio Goncalves, Business Lead, Technical Advisory at DNV. It applies to both existing and new WTIVs, ensuring right from the design stage that vessels can operate within a reasonable range of conditions. This allows operators to assess the sea state limit in each situation for safe lowering of the jack-up legs, without the risk of damaging the vessel, the cargo or the environment or endangering crew. With input from all JIP participants, DNV developed a numerical model to accurately predict bottom-impact forces.
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