Numerical simulation about the manoeuvre of trimaran and asymmetric twin hull with hull attitude taken into account by O
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ORIGINAL ARTICLE
Numerical simulation about the manoeuvre of trimaran and asymmetric twin hull with hull attitude taken into account by OpenFOAM Jiaye Gong1 · Yunbo Li1 · Fan Jiang2 Received: 13 February 2019 / Accepted: 3 September 2019 © The Japan Society of Naval Architects and Ocean Engineers (JASNAOE) 2019
Abstract Based on CFD method, the numerical method for the manoeuvre simulation of trimaran and asymmetric twin hull by OpenFOAM was applied in this paper. The grid independency test was carried out, and the computed result of turn and zigzag manoeuvres was compared with the result of self-propulsion experiment to validate the numerical method. Then, the numerical method was applied to simulate the turn and zigzag manoeuvres of both an actual trimaran and an actual asymmetric twin hull. By the manoeuvre simulation in calm water with hull attitude fixed and free, the effect of hull attitude on the manoeuvre of trimaran and asymmetric twin hull with different layouts and Froude number was discussed, and the importance of hull attitude for the numerical simulation of turn and zigzag manoeuvres was illustrated. The result shows that, the numerical method in this paper is valid for the manoeuvre simulation of trimaran and asymmetric twin hull, and it makes sense to take the hull attitude into account for the manoeuvre simulation of trimaran and asymmetric twin hull. Keywords Turn manoeuvre · Zigzag manoeuvre · Trimaran · Asymmetric twin hull · OpenFOAM
1 Introduction Both trimaran and asymmetric twin hull are high-performance ships. As a widely used high-speed ship, trimaran is composed of one main hull and two side hulls, and the displacement of the side hull is less than 10% of the main hull. On the basis of trimaran’s high hydrodynamic performance, the asymmetric twin hull is designed by removing one of the side hulls from trimaran. By taking advantage of the layout and the favourable interaction between center hull and side hull, the lateral stability, deck area and rapidity of both trimaran and asymmetric twin hull are significantly improved [1–3]. The investigation about the hydrodynamics of trimaran is widely carried out from the beginning of 21st century, but most of the study is focused on the resistance in calm water and the seakeeping performance in head wave. * Yunbo Li [email protected] 1
College of Ocean Science and Engineering, Shanghai Maritime University, Shanghai, China
College of Shipping Building Engineering, Harbin Engineering University, Harbin, China
2
As one of the most important hydrodynamic characteristics, more study about the manoeuvrability of trimaran and asymmetric twin hull should be carried out. Compared with the resistance and seakeeping performance, the research about the manoeuvrability of ship is relatively more complicated, and most of the research was carried out by experiment method and CFD method. In 1970s, the MMG (Manoeuvring Model Group) was proposed by Japanese researchers [4, 5], which is considered as a classical model for the prediction of ship’s manoeuvr
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