Abstract
| Language | English |
|---|---|
| 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 |
|---|---|
| Abbreviated title | SCC 2017 |
| Country | United Kingdom |
| City | London |
| Period | 5/09/17 → 6/09/17 |
| Internet address |
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Keywords
- extreme trim operation
- unsteady RANSE
- calm water resistance performance
- automatic wake analysis
- self-propulsion performance
- cavitation simulation
Cite this
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Calm water resistance and self propulsion simulations including cavitation for an LNG carrier in extreme trim conditions. / Maasch, M.; Turan, O.; Khorasanchi, M.; Fang, Ivy.
2017. Paper presented at International Conference on Shipping in Changing Climates 2017, London, United Kingdom.Research output: Contribution to conference › Paper
TY - CONF
T1 - Calm water resistance and self propulsion simulations including cavitation for an LNG carrier in extreme trim conditions
AU - Maasch, M.
AU - Turan, O.
AU - Khorasanchi, M.
AU - Fang, Ivy
PY - 2017/9/5
Y1 - 2017/9/5
N2 - 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%.
AB - 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%.
KW - extreme trim operation
KW - unsteady RANSE
KW - calm water resistance performance
KW - automatic wake analysis
KW - self-propulsion performance
KW - cavitation simulation
UR - http://www.lowcarbonshipping.co.uk/index.php?option=com_content&view=article&id=70&Itemid=188
M3 - Paper
ER -