The module is based on computational fluid dynamics (CFD) methods to correct for changing operational conditions and is said to produce much more accurate results than existing approximate or experimental methods.
“We use data that shipping companies are already collecting,” explained Dr Torsten Büssow, head of fleet performance management, DNV GL.
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, says DNV GL. Experts suggest that, as a result of hull fouling, the world fleet could be sailing with approximately 30% added resistance and consequently significantly higher levels of fuel consumption.
Undertaking hull and propeller cleaning on a more regular basis is already recognised as improvement lever by many shipping companies. But, the question of when and how the procedure should be carried out has not yet been “addressed systematically”.
“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,” Mr Büssow added.
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 like speed, draft, trim, weather and other operating conditions.
The hull and propeller degradation computation is offered as part of DNV GL’s new fleet performance management service, ECO Insight, which provides a comprehensive and accessible way to manage the performance of a fleet, including voyage, hull and propeller, engine and systems performance.
DNV GL says it enriches customers’ own fleet reports with industry data, such as Automatic Identification System (AIS), weather, or fuel, and provides unique benchmarking capabilities.