A Study on Nonlinear Free Surface Flows around a Submerged High Speed Foil

水下高速水翼周围非线性自由表面流研究

• 批准号: 04302037
• 负责人: MORI Kazu-hiro
• 金额: $ 5.89万
• 依托单位: HIROSHIMA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Co-operative Research (A)
• 财政年份: 1992
• 资助国家: 日本
• 起止时间: 1992 至 1993
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-04302037/
• 关键词: Free Surface flow; Finite difference; Rankine source method; wave breaking; spray; wave height measurement; submerged foil; 自由表面; 水中翼; 造波抵抗; 特異点法; タンデム水中翼; 振動翼; 数値シミュレーション; Free Surface flow; Finite difference; Rankine source method; wave breaking; spray; wave height measurement; submerged foil; 自由表面; 水中翼; 造波抵抗; 特異点法; タンデム水中翼; 振動翼; 数値シミュレーション

Through the present cooperative research, following fidings can be mentioned.1. A new finite difference method such as an artificial third order difference, a numerical wave absorber and a composite grid system are newly introduced for the free surface flow computations. The application showed that the method was much better both in accuracy and in efficiency. A method applicable to the wave breaking phenomena is also developed to simulate breaking waves of a progressive wave and around bow of piercing bodies. Some data were compared with the experimets.2.An improvement for the Rankine source method is introduced where an optimized basic flow is used. The method is applied to simulate the flow around a tandem hlydrofoil to find the optimum arrangement.3.Strong nonlinear phenomena such as wave/wake interaction and spray around a planing plate are studied to make clear the phenomena.4.A new wave hieght measurement method is developed where an image processing techniques are used. The visualization is carried out by illuminating the water/air boundaries. Because the method is a non-contact type, it can be positively used for the studies on a strongly nonlinear free-surafce flow where even a tatch changes the flow.

通过当前的合作研究，可以提及fid。新介绍了一种新的有限差异方法，例如人工三阶差异，数值波吸收器和复合网格系统，用于自由表面流量计算。该应用程序表明，该方法在准确性和效率方面都要好得多。还开发了一种适用于波浪破裂现象的方法，以模拟渐进波和穿孔体的弓的破裂波。将一些数据与实验进行了比较。2。在使用优化的基本流量的情况下，引入了Rankine源方法的改进。该方法用于模拟串联铁丝面条周围的流动以找到最佳排列。3.Strong非线性现象（例如波/唤醒相互作用），并研究了在刨床周围喷洒，以清除现象。可视化是通过照亮水/空气边界来进行的。由于该方法是一种非接触型类型，因此可以将其积极地用于强烈非线性自由式流动流的研究，即使是污染的流动也会改变流量。