CFD-Based Analysis of Hull-Spacing Effects on Manoeuvrability of SWATH
- Li Xia (Shanghai Jiao Tong University) | Zao-Jian Zou (Shanghai Jiao Tong University) | Yi Liu (Shanghai Jiao Tong University) | Lu Zou (Shanghai Jiao Tong University)
- Document ID
- International Society of Offshore and Polar Engineers
- The 28th International Ocean and Polar Engineering Conference, 10-15 June, Sapporo, Japan
- Publication Date
- Document Type
- Conference Paper
- 2018. International Society of Offshore and Polar Engineers
- SWATH, CFD, manoeuvrability, demi-hull spacing
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- 22 since 2007
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In this paper, the manoeuvrability of SWATH is studied by using CFD method. Numerical simulation of viscous flow around SWATHs with different demi-hull spacing undergoing pure sway/yaw motions are conducted by solving the three-dimensional incompressible RANS equations. From the numerical computations, the criterion index C for inherent dynamic stability and manoeuvrability index T are obtained. The conclusions are as follows: 1. The inherent dynamic stability grows worse with the decreasing in demi-hull spacing; 2. The effect of demi-hull spacing upon the dynamic stability along a straight course, the initial turning ability and the course-changing ability is not significant.
A Small Water-plane Area Twin Hull (SWATH) is a twin-hull ship designed with minimized water-plane area at the free surface. The streamlined struts of SWATH connect the hulls with the upper structures of the vessel. As a kind of high performance ship, SWATH has many advantages, such as good transversal stability, excellent seakeeping performance, spacious deck, low wave-making resistance, flexible layout. For this reason, it has drawn many researchers’ attentions. Nowadays, there are many references about the resistance and seakeeping performances of SWATH, but less about manoeuvrability.
Manoeuvrability is one of the most important hydrodynamic performances of a ship, which is closely related to navigation safety and efficiency. A lot of marine accidents are due to the poor maneuverability which could cause not only great losses of life and property but also environmental pollution. Therefore, IMO (International Marine Organization) and many organizations have formulated criteria of maneuverability. It is required that prediction of ship maneuverability should be conducted early in the design stage.
With the wide application of SWATH in military and civil area, the maneuverability prediction of SWATH is of important significance and practical value. Zlatev et al. (2009) set up an experimental programme for investigation of manoeuvring characteristics of the Delft372 catamaran, including pure sway, pure yaw and yaw with drift PMM captive tests; Milanov et al. (2011) studied on Delft372 catamaran manoeuvring and course stability in deep and shallow water; Milanov et al. (2012) focused his effort to estimate the vessel manoeuvrability and directional stability by using system based simulation of Delft372 Catamaran. Turning manoeuvrability of catamaran surface vessel has been studied in Pandey et al. (2016) by using a combined experimental and simulation method.
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