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

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.

通过本次合作研究，可以得出以下结论：1.本文介绍了一种新的有限差分方法，如人工三阶差分、数值消波器和复合网格系统。实际应用表明，该方法具有较高的精度和效率.本文还提出了一种适用于波浪破碎现象的方法，用于模拟前进波和穿流体船首周围的破碎波。对Rankine源方法进行了改进，采用了优化的基本流场。应用该方法对串列翼型绕流进行了数值模拟，以寻求最佳的翼型绕流方案。3.研究了波/尾流相互作用和滑行平板周围的喷雾等强非线性现象，以明确这一现象。4.提出了一种新的波高测量方法，并将图像处理技术应用于波高测量。通过照亮水/空气边界进行可视化。由于该方法是非接触式的，因此，它可以积极地用于研究强非线性的自由表面流动，即使是一个tatch也会改变流动。

项目成果

朴 鍾千: "有限差分法による2次元及び3次元波崩れの数値シミュレーション" 日本造船学会論文集. 175. (1994)

Jong-cheon Park：“使用有限差分法对二维和三维波浪塌陷进行数值模拟”，日本造船学会汇刊 175。（1994）

Claudio M.P.Sampaio: "Computation of Norlinear Free Surface around Simple Bow Shape" Proc.Send Symposium on Nonlinear and Free Surface Flows. 56-59 (1993)

Claudio M.P.Sampaio：“简单弓形状周围的非线性自由表面的计算”Proc.Send 非线性和自由表面流研讨会。

Adrian Lurgu: "A study on Numerical Schemes for More Accurate and Efficient Comutations of Freesurface Flows by Finite Difference Method" Jour.of Soc.of Naval Arch.of Japan. Vol.173. 9-17 (1993)

Adrian Lurgu：“通过有限差分法对自由表面流进行更准确和高效换算的数值方案的研究”Jour.of Soc.of Naval Arch.of Japan。

片岡克己: "3次元タンデム水中翼の性能について" 西部造船会々報. 86. 13-26 (1993)

Katsumi Kataoka：“关于三维串联水翼的性能”西方造船协会通报 86. 13-26 (1993)。

Hisashi Kajitani: "On Wave-Wake Interaction Near a Ship Stern" Proc.9th Workshop on Water Waves and Floating Bodies. (1994)

Hisashi Kajitani：“船尾附近的波浪-尾流相互作用”Proc.9th 水波和漂浮体研讨会。