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BUNKER INDEX :: Price Index, News and Directory Information for the Marine Fuel Industry
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Design changes lead to 10% bunker savings for Hapag-Lloyd Cruises ships: DNV GL

10 Nov 2017 10:45 GMT

More than 100,000 hull variations examined during painstaking process.



DNV GL says the design changes made on new passenger expedition ships for Hapag-Lloyd Cruises have resulted in projected annual fuel savings of more than 10 percent.

The two vessels, Hanseatic nature and Hanseatic inspiration, are currently under construction at the Vard Shipyard in Romania and Norway and are expected to launch in April and October 2019.

Brought in during the initial design and conception phase, DNV GL experts first created and explored more than 100,000 hull variations for the vessels. They worked to give Hapag-Lloyd Cruises and Vard an idea of the technical possibilities of various hull forms and how the interactions between the hull form, the initial general arrangement and stability requirements would impact fuel consumption.

After the initial assessment, the efficiency of the hull form was optimized within the given constraint set using DNV GL's unique formal optimization approach. During this phase, another 10,000 hull designs were analyzed, with the most promising candidates undergoing high fidelity computational fluid dynamic (CFD) analysis to confirm the results.

"We are very pleased to have been able to exceed Hapag-Lloyd Cruises' expectations and offer an optimization solution that demonstrates that efficiency and sustainability can go hand in hand," said Knut Orbeck-Nilssen, CEO DNV GL - Maritime. "These results show that by bringing greater computing power and smart software to the ship design process we can help to unlock efficiencies for our customers."

"Because these ships will have the highest ice class possible for passenger vessels, PC6, fuel consumption is an essential factor in their economic feasibility," added Juryk Henrichs, Senior Project Engineer, DNV GL - Maritime. "With roughly 7,000 CPUs doing the heavy lifting, our unique form-parametric hull model was able to identify the optimal design to meet Hapag-Lloyd Cruises' specifications."

"The design concept for the two new ships was 'inspired by nature'," explained Dr. Henning Brauer, Head of New Builds, Hapag-Lloyd Cruises. "The vessel interiors have been created to reflect the environments our passengers are experiencing inside the ships. But these are also sensitive environments, so reducing the environmental impacts of our vessels is an integral part of the design concept. Working with DNV GL has allowed us to significantly reduce fuel consumption, which also decreases our overall emissions."


Image: Wave elevation and pressure distribution on the optimized hull. Image credit: DNV GL




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