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Numerical Investigation of Step Depth Effects on Hydrodynamic Performance of Planing Hull Using Dynamic Mesh and Two Degree of Freedom Model | ||
| AUT Journal of Mechanical Engineering | ||
| مقاله 1، دوره 3، شماره 2، اسفند 2019، صفحه 139-148 اصل مقاله (1.79 M) | ||
| نوع مقاله: Research Article | ||
| شناسه دیجیتال (DOI): 10.22060/ajme.2019.14364.5723 | ||
| نویسندگان | ||
| Reza Tork Chooran1؛ Rouzbeh Shafaghat* 1؛ Reza Yoosefi2 | ||
| 1Sea-Based Energy Research Group-Babol Noshirvani University of Technology-Babol-Iran | ||
| 2Department of Mechanical Engineering, Babol Noshiravani University of Technology | ||
| چکیده | ||
| At low speeds, planing hull performs like a displacement one and buoyancy force has the most influence on it, but, when it reaches to enough speed, hydrodynamic lift force equilibrates 50–90 percent of its weight. Planing hull researchers have introduced different methods in order to achieve the highest speed. A desirable planing hull has low weight-to-power ratio and good maneuverability. Several ways have been applied to reduce drag and one of the best strategies is to use step that leads to less wetted surface and more lift power. This work addresses the numerical study of step height effect on hydrodynamic performance of planing hull. A specified form of a monohull was changed to the step one while important geometric parameters such as Deadrise angle, width and length were equal in both of them. In order to simulate hull movements, a comprehensive series of viscous computational fluid dynamics simulations considering free-surface and two degree of freedom motion of the hull (heave and pitch) have been performed by application of dynamic mesh. Results have been presented as contours and plots. According to the results, deeper steps provide greater levels of ventilation but, there is a limit in step depth increment because porpoising happens after a specific height. | ||
| کلیدواژه‌ها | ||
| High speed planing hull؛ Step؛ Two degrees of freedom؛ Trim angle؛ Volume of Fluid Method | ||
| مراجع | ||
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