Numerical simulation of ice-breaking with amphibian air cushion vehicle

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Journal of Vibration and Shock ›› 2012, Vol. 31 ›› Issue (24) : 148-154.

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Numerical simulation of ice-breaking with amphibian air cushion vehicle

Lu Zai-hua1, Zhang Zhi-hong1, Hu Ming-yong1, Yao Jun2, Zhang Liao-yuan3

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Abstract

Ice sheet can be broken into small slabs with a heavy air cushion vehicle (ACV) traveling on float ice sheet at the critical speed. Ice-breaking with ACV is a new ice-breaking method in in-land river which has important application in prevention of ice jam flood in the Yellow River. In this paper, the ice-breaking process of ACV is numerical simulated under a shallow water and thick ice sheet condition. According to the simulating results, ACV traveling at the critical speed always chases after and pushes the wave crest ahead of ACV. Thus, the amplitude of the wave around ACV gradually increases due to the continual push of ACV. Initial crack of ice sheet appears at wave trough near the stern of ACV and extends along the axis of ACV in both forward and backward direction. Lateral crack at the wave crest ahead of ACV is arose when the initial crack extend forward to wave crest. An ice-breaking period is finished by ACV accordingly. The cracks behind ACV shaped as an asterisk symbol along the sailing direction of ACV. The ice sheet breaks into triangular slabs when lateral cracks of different ice-breaking periods intersecting with each other. ACV should sails at the same direction parallel in order to cross the cracks of different ACV voyages and break the ice sheet further.

Key words

air cushion vehicle / ice-breaking / numerical simulation / crack

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Lu Zai-hua;Zhang Zhi-hong;Hu Ming-yong;Yao Jun;Zhang Liao-yuan. Numerical simulation of ice-breaking with amphibian air cushion vehicle[J]. Journal of Vibration and Shock, 2012, 31(24): 148-154