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The effect of extreme trim operation on propeller cavitation in self-propulsion conditions

Maasch, Matthias and Turan, Osman and Day, Alexander (2018) The effect of extreme trim operation on propeller cavitation in self-propulsion conditions. In: A. Yücel Odabaşı Colloquium Series 3rd International Meeting on Progress in Propeller Cavitation And its Consequences. Istanbul Technical University, Istanbul, pp. 119-128.

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Experimental and numerical studies have shown that operating an LNG Carrier in extreme bow-up trim conditions can lead to substantial savings of over 25% in nominal ship resistance. The present study applies the Extreme Trim Concept to RANSE self-propulsion simulations including the prediction of propeller cavitation. It was investigated how the transient cavitation location and volume changed with varying ship displacements and trim angles over a range of ship speeds. Further, the effect of extreme trim and cavitation development on the ship delivered power was analysed. Results have shown that by operating an LNG Carrier in extreme trim, power consumption and the extent of cavitation were reduced considerably. This study proved that the Extreme Trim Concept can be a valuable operating approach for reducing the environmental impact of LNG Carriers.