Numerical analysis of added resistance on an icebreaker in regular waves
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LETTER TO THE EDITOR
Numerical analysis of added resistance on an icebreaker in regular waves Chao Chen1,2,3 · Ya‑dong Liu1,2,3 · Yan‑ping He1,2,3 · Xing‑yu Li1,2,3 Received: 7 January 2020 / Accepted: 25 June 2020 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2020
Abstract As the global warming, the Arctic Shipping Routes are gradually opened. The icebreakers are still in need to ensure the safe navigation of ships. During the voyage from East Asia to North-western Europe, the icebreaker will experience a longdistance voyage where over 60% of the distance is open water. As the bow of the icebreaker is full and the length-beam ratio is relatively high, it is quite important to study added resistance of the icebreaker. The results of added resistance, heave and pitch motion in regular waves are consistent with the variation trend using two methods. For computational efficiency, the nonlinear potential method was used to predict added resistance and vertical movement of the icebreaker at five wind directions. The added resistance in head waves is higher than in other wave directions. The maximum value was obtained at the wave length-ship length ratio of 1.2. The relationship between the phase of motion and resistance can be easily obtained. Meanwhile, the free surface around the hull can also be easily obtained. Moreover, compared to the CFD method, the nonlinear potential method can save more computing resources and time. It has important application value in the early design of the icebreaker. Keywords Icebreaker · Added resistance · CFD method · Nonlinear potential method · Regular waves
1 Introduction As the sea ice thaw out due to the global warming, the Arctic Shipping Routes are gradually opened and may become the main shipping route connecting North-western Europe to East Asia. More and more people realize the impact of the Arctic Shipping Routes on the whole world. Considering that ice and ice-pacts will remain a concern in the future, the support of icebreakers will still in need to facilitate the safe passage of ships [1]. From Shanghai to Rotterdam, for example, the arctic route covers a total distance of 7654 nautical miles, including 2936 nautical miles from the Bering Strait to the north cape of Norway, and 4718 nautical miles from * Ya‑dong Liu [email protected] 1
State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
2
Collaborative Innovation Center for Advanced Ship and Deep‑Sea Exploration (CISSE), Shanghai Jiao Tong University, Shanghai 200240, China
3
School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
the ice-free region, accounting for over sixty percent of the total distance [2]. Due to the significance of the icebreakers in long open-water voyage, it is attractive to make icebreaker operating more efficiently by lowering their fuel consumption. It is worthy to study the added resistance. The problem of added resistance in waves is a classical prob
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