The module is based on CFD methods to correct for changing operational conditions and produces much more accurate results than existing approximate or experimental methods, the class society said.
Fuel efficiency remains a key concern for shipping, but tracking hull and propeller degradation is a challenge that has not yet found an adequate solution. Experts have suggested that, as a result of hull fouling, the world fleet could be sailing with around 30% added resistance and consequently with significantly higher fuel consumption.
Undertaking hull and propeller cleaning on a more regular basis is already recognised as improvement tool by many shipping companies. However, the question of when and how the procedure should be carried out has not yet been addressed systematically.
Hull and propeller performance computations show how much resistance is added over time due to fouling, by analysing the gap between the theoretical and measured power demand of a vessel, after correcting for influences, such as speed, draft, trim, weather and other operating conditions.
“We use data that shipping companies are already collecting,” Dr Torsten Büssow, DNV GL’s head of fleet performance management, explained. “Our CFD capabilities, which we also use in our lines optimisation, retrofit and trim assistant services, allow us to very accurately normalise vessel specific power demand under each reported condition.”
The hull and propeller degradation computation is offered as part of DNV GL’s new fleet performance management service - ECO Insight.
DNV GL is holding a series of webinars on antifouling for ships. To sign up contact [email protected]