Vision 2012/1 - Rolls-Royce

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Maximum waterline length/less resistance 24 o 18 o which has a calm water resistance from 15% to 45% less than state-of-the-art traditional forms of 20 and 22m beam over the relevant speed range, and maintains its advantage also in a seaway. Spreading the results of basic research over several application areas allows more very detailed R&D to be done. The work includes CFD analysis of possible forms, detailed investigation of promising candidates, and verification by tank testing. The design and test iteration is also used to improve prediction accuracy in general. By carrying out CFD work as if the mathematical model was the same size as the physical tank model, small discrepancies between methods can be identified, and either eliminated or allowed for. The result is more accurate predictions at an early stage in the design process. Wave piercing. The company’s wave piercing technology is a good example of this work. The winning of orders for vessels demonstrates the effectiveness of the approach. This does not mean a ’one size fits all’ attitude – instead the underlying research is applied in different ways to achieve the qualities needed for the customer’s application. For instance, Farstad has placed an order for a UT 754 WP design and systems package. This is a high capacity PSV, 91.6m long, and about 5,700 tonnes deadweight, capable of carrying 3,200 tonnes on deck. The notation WP denotes a UT-series vessel with the new wave-piercing bow, designed to allow higher speeds through waves. The upper portion comes into effect in severe head seas, shedding green water and keeping spray off the wheelhouse. At the same time, the full beneficial effect of the bulbous bow is gained in a hullform that is easily driven despite its wide beam and large capacity, giving low fuel consumption over a range of transit speeds. 14 VISION 1/12
No flare at bow Straight lined Wave-Piercing Bow Conventional Bow The general Performance in a Seaway research is also relevant for vessels for a different market; coastal and short sea cargo. Here, the goal is improved hullforms so that vessels can maintain speed in tough conditions instead of slowing down in head seas and then burning a lot of fuel to keep schedule. The solution, which is now being applied to vessels recently ordered by Nor Lines, is the Environship concept, which includes a bow with a bulb, vertical leading edge and straight line sections above the waterline, with no flare, and optimised bow and stern lines to reduce power requirements for a given speed and deadweight in rough sea conditions. Calm water performance values Relativ Power (%) 150 140 130 120 110 100 90 Traditional B=22m Traditional B=20m Wave Piercing B=23m 80 8 10 12 14 16 Speed (knots) Power for a given speed for PSVs of different beams. The new <strong>Rolls</strong>-<strong>Royce</strong> wave-piercing hull is taken as 100%. VISION 1/12 15
Page 1 and 2: OFFSHORE MAGAZINE VISION NO. 1/2012
Page 3 and 4: NO. 1/2012 VISION 1/12 Editor: Anet
Page 5 and 6: UT 735 UT 731 CD UT 788 Farstad Shi
Page 7 and 8: Close cooperation for new crane con
Page 9 and 10: LARGE LIFTING CAPABILITIES Rolls-Ro
Page 11 and 12: fuel system with multiple injection
Page 13: VISION 1/12 13
Page 17 and 18: Energy efficiency will increase Fle
Page 19 and 20: With more and more E&P work taking
Page 21 and 22: Benefits of underwater repair Avai
Page 23 and 24: of Rolls-Royce support ROLLS-ROYCE
Page 25 and 26: The WTIV may transport to site and
Page 27 and 28: personnel to wind turbines in shall
Page 29 and 30: New European training centre in Nor
Page 31 and 32: NORTHERN EUROPE DENMARK Aalborg Tel

Vision 2012/1 - Rolls-Royce

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