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首页> 外文期刊>International Shipbuilding Progress >Confined water effects on the viscous flow around a tanker with propeller and rudder
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Confined water effects on the viscous flow around a tanker with propeller and rudder

机译：密闭水对带有螺旋桨和方向舵的油轮周围粘性流的影响

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摘要

A ship travelling in canals or narrow channels may encounter hydrodynamic forces and moments caused by a nearby side bank. Since most canals are shallow the effect of the bottom can also be considerable. Knowledge of these effects is crucial for safe navigation. The present paper introduces a study in the framework of a project applying Computational Fluid Dynamics (CFD) in the prediction of confined water effects. Using a steady state Reynolds Averaged Navier-Stokes solver, this study investigates the shallow-water and bank effects on a tanker moving straight ahead at low speed in a canal characterized by surface piercing banks. The tanker is fitted with a rudder and a propeller at a zero propeller rate and at self-propulsion. In the systematic computations, a series of cases are considered with varying water depth and ship-to-bank distance, as well as different canal configurations. In the computations, the double model approximation is adopted to simulate the flat free surface. The non-rotating propeller is treated as an appendage composed of shaft and blades, while the operating propeller is approximated by body forces, simulated by a lifting line potential flow model. Validation of forces and moments against experimental data has been performed in previous studies. The emphasis of the present paper is placed on the effects on the flow field and the physical explanation of these effects.
机译：在运河或狭窄航道中行驶的船舶可能会遇到附近侧岸引起的水动力和力矩。由于大多数运河较浅，因此底部的影响也很大。了解这些影响对于安全导航至关重要。本文介绍了在应用计算流体动力学（CFD）预测承压水影响的项目框架内的一项研究。本研究使用稳态的雷诺平均Navier-Stokes求解器，研究了浅水和堤岸对低速直行的，以堤岸为特征的运河中油轮的影响。该油轮装有舵机和螺旋桨，螺旋桨为零，具有自推进功能。在系统计算中，考虑了一系列情况，这些情况具有变化的水深和船到岸距离，以及不同的运河配置。在计算中，采用双重模型逼近来模拟平坦的自由表面。不旋转的螺旋桨被视为由轴和叶片组成的附件，而工作螺旋桨则由提升力势流模型模拟的体力来近似。在以前的研究中已经根据实验数据验证了力和力矩。本文的重点放在对流场的影响以及这些影响的物理解释上。

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