当前位置: X-MOL 学术J. Mar. Sci. Eng. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
The Effect of Longitudinal Rails on an Air Cavity Stepped Planing Hull
Journal of Marine Science and Engineering ( IF 2.9 ) Pub Date : 2021-04-27 , DOI: 10.3390/jmse9050470
Filippo Cucinotta , Dario Mancini , Felice Sfravara , Francesco Tamburrino

The use of ventilated hulls is rapidly expanding. However, experimental and numerical analyses are still very limited, particularly for high-speed vessels and for stepped planing hulls. In this work, the authors present a comparison between towing tank tests and CFD analyses carried out on a single-stepped planing hull provided with forced ventilation on the bottom. The boat has identical geometries to those presented by the authors in other works, but with the addition of longitudinal rails. In particular, the study addresses the effect of the rails on the bottom of the hull, in terms of drag, and the wetted surface assessment. The computational methodology is based on URANS equation with multiphase models for high-resolution interface capture between air and water. The tests have been performed varying seven velocities and six airflow rates and the no-air injection condition. Compared to flat-bottomed hulls, a higher incidence of numerical ventilation and air–water mixing effects was observed. At the same time, no major differences were noted in terms of the ability to drag the flow aft at low speeds. Results in terms of drag reduction, wetted surface, and its shape are discussed.

中文翻译:

纵向导轨对空阶阶梯式船体的影响

通风船体的使用正在迅速扩大。但是,实验和数值分析仍然非常有限,特别是对于高速船和阶梯式滑行船体。在这项工作中,作者介绍了拖船试验和CFD分析之间的比较,该分析是在单步滑行船体底部进行强制通风的情况下进行的。该船的几何形状与作者在其他作品中介绍的几何形状相同,但增加了纵向栏杆。尤其是,该研究从阻力和湿润表面评估的角度解决了导轨对船体底部的影响。该计算方法基于具有多相模型的URANS方程,用于空气和水之间的高分辨率界面捕获。进行了七种速度和六种气流速率以及无空气喷射条件的测试。与平底船体相比,数值通风和空气-水混合效应的发生率更高。同时,在以低速向后拖动气流的能力方面,没有发现主要差异。讨论了减阻,湿润表面及其形状方面的结果。
更新日期:2021-04-28
down
wechat
bug