【作者】 宋永军；

【导师】 邹早建； 高高；

【作者基本信息】 武汉理工大学 ， 流体力学， 2005， 硕士

【摘要】 随着现代船舶的高速化与大型化，航道水深相对变小，航道宽度相对变窄，使内河航道成为浅窄航道。当船舶在限制水域中航行时，航道的水底及岸壁对船舶兴波阻力有较大的影响，为了设计在内河航道中具有较好阻力性能的高速船舶，研究浅窄航道对兴波阻力的影响有重要的实际意义。 本论文应用Rankine源一阶面元法数值计算船舶在浅窄航道中作匀速直航运动时的非线性兴波阻力。基于势流理论，采用在船体表面、自由表面以及岸壁分布Rankine源来表达流场速度势，利用迭代方法满足非线性自由面边界条件，采用映像法满足水底边界条件，采用网格错位法满足辐射条件；即将自由面的源层上置一定的高度，并用点源来代替面元上的源分布，同时使点源相对于对应的自由面配置点向后错位一定的距离。然后通过在各个边界面满足相应的边界条件来求出源强，进而得到所求的兴波阻力。 采用上述方法，本文以数学船型Wigley船为例进行了数值计算。在深水条件下，计算了在航道中航行的船舶的兴波阻力，将结果与他人公开发表的计算和试验数据相比较，吻合程度较好，验证了本程序的可靠性。考虑在浅水的条件下，改变航道宽度参数，得到相应条件下的兴波阻力，通过分析船舶兴波阻力系数与航道宽度之间的关系，得到航道宽度变化对兴波阻力的影响。依据由本文计算结果绘制成的曲线，可以为在船模阻力试验中如何确定合适的船模尺寸提供一些参考。 考虑到实际的航道岸壁大多为倾斜岸壁，为增强本方法的实用性，在上述基础上，通过改变航道岸壁的倾斜角度，计算船舶在不同航道宽度情况下的兴波阻力，由兴波阻力系数与岸壁倾角之间的关系分析，得到倾斜岸壁对船舶兴波阻力的影响。 本论文的研究对用计算流体动力学(CFD)方法预报船舶的水动力性能以及指导船模试验有一定的实用价值。更多还原

【Abstract】 With the speed and scale of modern ships getting higher and larger, the depth turns shallow and the width turns narrow correspondingly, which made the sea-route be the restricted water. When the ship moves in the above-mentioned route, the bottom and bank sides exert much influence on the wave-making resistance. In order to design the high-speed ship moving in the restricted water, it is meaningful to research the effect of the width on the resistance.A Rankine Panel Method is developed for calculating the nonlinear wave-making resistance of a ship moving forward with a constant speed in restricted water. Based on the potential theory, the disturbance velocity potential is expressed by a Rankine source distribution on the body surface, the free surface and the bank sides. The nonlinear free surface condition is satisfied in an iterative manner, whereas the boundary condition on the bottom is satisfied by the method of images, and the radiation condition is satisfied by the numerical technique of staggered grids. That is to say, the free surface source layer is elevated to a certain height above the free surface and the panel sources are replaced by the point sources, which are shifted backwards relative to the collocation points on the free surface in the longitudinal direction. The source strength are obtained by satisfying all the boundary conditions on each side, and the wave-making resistance is gained consequently.Using the above-mentioned method, this thesis made numerical calculations for a mathematical hull Wigley. The wave-making resistances of the ship moving in deep water were calculated out, and the results are closed to the data published in the literatures, which test the reliability of the program. The results in shallow water were obtained at different speeds and with different widths in the waterways, then the effect of the width on the resistance was analyzed and some meaningful conclusions were drawn. According to the curve gained from theresults of this thesis, some references can be offered about the decision of the befitting size of the ship models.Because the most actual bank sides are slantwise, the wave-making resistance under different width conditions was calculated by changing the angle of the bank sides to test the practicability of this program. By analyzing the angle of the slantwise bank and the coefficient of the wave-making resistance, the optimal distance to the bank can be determined.The research of the thesis is helpful to the prediction for hydrodynamic performance of the ship and the guidance for ship model experimentation.更多还原