Volume 17, Issue 2 (2017)                   Modares Mechanical Engineering 2017, 17(2): 85-92 | Back to browse issues page

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Najarian A, Shafaghat R. Numerical Modeling of High-Speed Tunneled Hull Turning Circle Maneuver for Investigating the Speed and Rudder Angle Effects on Maneuver Parameters. Modares Mechanical Engineering. 2017; 17 (2) :85-92
URL: http://mme.modares.ac.ir/article-15-5402-en.html
Abstract:   (2247 Views)
Demands for high speed vessels are increasing due to various usages. Reducing the resistance to achieve high speeds is an important objective in design of high speed crafts. Creating longitudinal side tunnels in the hull causes resistance reduction. Designing the boat is not right only for reducing drag force; stability and maneuverability are also important factors. In this paper, high speed tunneled hull performance is evaluated considering numerical simulation of turning circle maneuver as a standard maneuver. The numerical approach is implemented due to high and acceptable accuracy compared with mathematical models and lower cost compared to experimental tests. Among the various techniques, modeling of maneuver of the boat was performed by considering mesh movement with boat and combination of sliding mesh and movement of domain as an effective method. Reducing computation time and increasing the accuracy of solution is of its advantages. Finite volume method and k-ω model is used respectively for discretization equations and simulation of turbulence. In free surface modeling, mixture model was preferred instead of free surface model. Solution methodology was validated using experimental results of a single-hull boat. Path of the boat in various tests was presented in the result section, considering the effect of angle of rudder, thrust and movement mode of the boat on the maneuver parameters. The results show enhancing maneuverability of the boat by approaching the planing mode so that by increasing the speed and closing to planing mode, tactical diameter is reduced up to 7.5% compared to the displacement mode.
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Received: 2016/12/25 | Accepted: 2017/01/9 | Published: 2017/01/29

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