Projects per year
Abstract
In recent years many studies and real-life applications dealing with trim optimisation have shown that operating a ship at small trim angles can improve the energy efficiency by up to 5% depending on ship speeds and loading conditions. This efficiency gain mainly results from the re-positioning of underwater hull features, such as the bulbous bow or the stern bulb. Different to the above described approach the present study deals with operating a LNG Carrier at an extreme bow-up trim angle of Ɵ = −1.9 deg. In order to predict the performance, URANS virtual towing tank simulations in calm water were performed for both, nominal resistance conditions and self-propulsion conditions including cavitation. The numerical results, including the ship resistance, the nominal propeller wake field and the simulation of propeller cavitation in self-propulsion conditions indicated a largely improved performance. Due to a significant reduction in nominal resistance by up to 27.5% the ship selfpropulsion point in extreme trim conditions was found at a lower propeller rotation rate compared to level trim conditions. This also reduced the cavitation volume and finally resulted in a delivered power reduction of up to 28.8%.
Original language | English |
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Number of pages | 10 |
Publication status | Published - 5 Sep 2017 |
Event | International Conference on Shipping in Changing Climates 2017 - UCL, London, United Kingdom Duration: 5 Sep 2017 → 6 Sep 2017 http://www.lowcarbonshipping.co.uk/index.php?option=com_content&view=article&id=70&Itemid=188 |
Conference
Conference | International Conference on Shipping in Changing Climates 2017 |
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Abbreviated title | SCC 2017 |
Country | United Kingdom |
City | London |
Period | 5/09/17 → 6/09/17 |
Internet address |
Keywords
- extreme trim operation
- unsteady RANSE
- calm water resistance performance
- automatic wake analysis
- self-propulsion performance
- cavitation simulation
Fingerprint Dive into the research topics of 'Calm water resistance and self propulsion simulations including cavitation for an LNG carrier in extreme trim conditions'. Together they form a unique fingerprint.
Projects
- 1 Finished
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Shipping in a Changing Climate
Day, S., Incecik, A. & Turan, O.
EPSRC (Engineering and Physical Sciences Research Council)
1/11/13 → 30/04/17
Project: Research