• 2017 May 10 18:41

    DNV GL adds asymmetric stern to ECO Lines hull optimization service

    A vessel with an asymmetric stern has a twisted aft shape that is designed to account for the differing flow conditions on each side of the propeller. The idea emerged in the 1960s, but due to the difficulty of manually developing the optimal shape, this design failed to make a large impact at the time. DNV GL has revisited the idea and, using high-fidelity computer fluid dynamics (CFD) in combination with parametric formal optimization, the classification society can now offer ship owners the option of incorporating an asymmetric stern into their new vessels, the society said in a press release.

    “Basically, what we are now able to do is model an aft shape that acts as a propulsion improving device, without the vibration and fatigue strength concerns that come with fins and nozzles,” says Karsten Hochkirch, Head of Department, Fluid Engineering at DNV GL – Maritime. “Using our in-house formal parametric optimization procedure, we can assess hundreds of options until we find a design that strikes an optimal balance between pre-swirl and resistance, while meeting the design requirements of the customer.

    In a recent project, a 3,000 TEU container ship was tuned to achieve minimum power consumption. Starting from a well-optimized symmetric baseline design, the asymmetric design achieved a propulsion power reduction of more than 3%, a result that was confirmed in tank testing. In another project, the ECO Lines team was asked to find propulsion efficiencies in a 38,000 DWT tanker. The CFD optimization generated a design promising a 3.5% percent decrease in propulsion power compared to the symmetrical design."

    “This is another instance where advances in computing power and software sophistication are enabling us to unlock efficiencies in ship design. By accurately simulating the performance of these complex hull forms, we are achieving propulsion power improvements of up to 5%, with greater structural robustness,” says Karsten Hochkirch. “And because yards are now able to utilise advanced CAD/CAM techniques and modern, CNC-controlled fabrication methods, they can bring these designs into production much more easily and economically.”




2018 February 21

18:07 ONE, OOCL and SACO Shipping use booking tool eBooking
17:43 Renovated Stena Line Terminal at Europoort starts operation
17:06 Project to map ocean floor by 2030 now operational
16:52 Rosterminalugol export coal terminal handles 3-millionth tonne YTD
16:22 Zelenodolsk Shipyard to host keel-laying of 11th Buyan-M class corvette, Feb. 23
15:03 Launching of RST27M Balt Flot 20 at Krasnoye Sormovo Shipyard slated for Feb. 22
14:14 NGO Shipbreaking Platform publishes list of ships dismantled worldwide in 2017
13:18 ATOMFLOT says Russia needs nine more icebreakers for the Northern Sea Route by 2025
13:01 Clarksons Platou collaborates with Maersk Line to provide shipping services in Egypt
12:43 Big Port of St. Petersburg imposes ice restrictions in the harbour effective as of March 7, 2018
12:31 Castellammare Di Stabia starts slipway works on the multipurpose amphibious unit
12:10 Rosterminalugol transferred over RUB 1.5bn of taxes to different budgets
12:01 Panama Canal hosts Cheniere Energy to discuss LNG’s Future at the waterway
11:25 MOL car carrier rescues castaways in the North Atlantic Ocean
10:53 Crude oil futures prices edge down 0.8% to $64,73 in London and 1% to $61,17 in New York
10:46 Sovcomflot and Shell ink time-charter agreements for Aframax LNG-powered duo
10:35 Vostochny Port obtains ISO 14001:2015 certificate
09:48 Port of St. Petersburg bunker prices move upward
09:26 Baltic Dry Index rises 2.76% to 1117 points

2018 February 20

18:37 Time is running out to register for the Dangerous Goods: New Requirements for Transportation Conference, March 1, 2018
18:31 Russian association of fishery businesses call to revise a 'fishing quotas per a keel' terms
18:06 AVANZA completes a successful trial with Daikin Reefer
17:38 The Maritime CIO Forume Cyprus 2018 to be held in Limassol, March 27
17:03 DNV GL issues over 50,000 electronic certificates
16:55 RIMS secured a further class approval from Korean Register of Shipping for the use of drones during surveys
16:39 Taganrog Commercial Sea Port spent $156 000 on environment protection in 2017
16:34 Wärtsilä and Maersk Drilling create a joint 25-year strategy for thruster services to increase uptime and reduce costs
16:04 Post-Brexit port health border disruption still a major concern for British ports
15:34 Goltens teams up with Yara Marine on SOx scrubbers
15:21 Taganrog Sea Commercial Port earmarked $74,4 to support social programmes in 2017
15:04 US Navy awards concept design contract to Fincantieri to evolve FREMM into FFG(X)
14:32 Port of Marseille Fos traffic up 8% in 2017
14:02 The largest vessel enters Busan Port since its opening
13:32 Carnival Fascination resumes year-round service from San Juan
13:20 Port of Kavkaz sees a 50% spike in freight volumes, to 1.98 million tonnes
13:09 Rosterminalugol coal exports reach 150-millionth tonne milestone
13:02 Partners start financing waste-to-chemistry project in Rotterdam
12:35 First foundation for the offshore wind farm Kriegers Flak installed in Denmark
12:18 Bunker fuel prices in the Far East ports remain firm
12:07 United Shipbuilding Corp: the floating co-generation plant Akademik Lomonosov is 96% complete
11:32 Rotterdam port diminishes the sale of bunker oil to 9.9 million m3 in 2017
11:27 APM Terminals Itajaí to double monthly volume
10:44 Crude oil futures price slides 0.29% to $65,48 in London, in New York gains 1.17% to $62,27
10:36 Sevastopol to host 6th Business Forum SIMBF 2018, June 6-7
09:49 Russian M100 product spot price gains last week to RUB 5,594/mt
09:30 Baltic Dry Index gains to 1087 points

2018 February 19

18:52 Russia’s Glavgosexpertiza gives nod to new phases of ZVEZDA Shipyard construction
18:05 Maersk Line increases FAK rates from Europe to West Coast South America, Caribbean and Middle America
17:05 Hapag-Lloyd introduces Asia – Middle East – New Asia Red Sea Service (AR1)
16:05 Maersk Line increases Reefer FAK rates from North Europe to Far East Asia
15:49 Iskes Towage & Salvage adds two more Damen ASD Tugs 2810 to its fleet
15:25 Maersk Line increases DRY rates from Russia to Far East Asia
15:02 The Russian Register of Seaports updates Port of Tuapse details
14:53 Nevsky Shipyard prepares the Akademik Pashin to test underway replenishment capabilities
14:26 Xeneta increases its data coverage by 161% in 2017
13:49 Rosmorport’s icebreakers assist shipping in the Gulf of Finland, escorted 17 vessels
13:12 GasLog reports financial results for 2017
12:01 GoodBulk announces delivery of Capesize vessel
11:46 Port of Mariupol freight volumes soar 32.3% to 455,860 tonnes
11:08 APL expands Eagle GO. Guaranteed service to 29 Asian port origins