Experiment and Nemerical Prediction for Onset of od Three Diemnsional Separation

三维分离发生的实验与数值预测

• 批准号: 61550042
• 负责人: NISHIKAWA Nobuhide
• 金额: $ 1.15万
• 依托单位: CHIBA UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for General Scientific Research (C)
• 财政年份: 1986
• 资助国家: 日本
• 起止时间: 1986 至 1987
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-61550042/
• 关键词: Three Dimensional Separation; Boundary Layer; Lateral Vortex; Visualization; Navier Stokes Equation; Numerical Simulation; 三次元流剥離; 縦渦

During the term of the Grant-in -aid the following items are verified or devised. 1. A simple Visualization technique is proposed which provides a record of tracer for the limitting streamlines along a model in a towing tank.Electrolysis method is applied with painting the phenolphtalein solution on a body surface. The visualization results over axisymmetric paraboloid and along a circular cylinder normal to flat plate are shown as examples.2. The results for paraboloid of revolution show a good agreement with those by Bippes as for the critical angles for the onset of closed separation line as high as 62 deg or so.3. Hydrogen bubble methods is also applied to visualize vorticis in the flowfields.For the case fo paraboloid the alternative shedding of lateral vortices canbe observed.4. Static pressure over the paraboloid was measured in a wind tunnel and a plateau of azunytgak oressyre distribution as in 2-D seqaration was confirmed behind primary separatin lines.5. As for the flow near the cylinder-plate juncture the nodes,saddles,and foci can be observed.The locations of foci move cyclically with the length of twin vortices behind the cylinder.6. Illustrating techniques of three dimensional flows in computer graphics are developed for the results of finite difference computation for tridimensional Navier Stokes equations as well as boundary layer solutions.

在助学金的有效期内，核实或设计了下列项目。1.提出了一种简单的可视化技术，该技术提供了拖曳水槽中沿模型限制流线的示踪剂记录，采用电解法将酚醛树脂溶液涂在物体表面。以轴对称抛物面和垂直于平板的圆柱为例，给出了可视化结果。对于高达62°左右的闭合分离线的临界角，回转抛物面的计算结果与Bippes的计算结果吻合较好。采用氢气泡方法对流场中的旋涡进行可视化，对于抛物面的情况，可以观察到侧向旋涡的交替脱落。在风洞中测量了抛物面上的静压，证实了主分隔线后面存在着与二维层序一样的天青石分布平台。对于圆柱板结合部附近的流动，可以观察到结点、鞍点和焦点，焦点的位置随着圆柱体后孪生涡长度的变化而周期性移动。针对三维Navier-Stokes方程的有限差分计算结果和边界层解，发展了计算机图形学中的三维流动图解技术。

项目成果

N.Nishikawa,Y.lnouye,and A.Suzuki: "3-D Computer Graphics for Three Dimensional Boundary Lay-" Theoretical and Applied Mechanics. 35. 17-25 (1987)

N.Nishikawa、Y.lnouye 和 A.Suzuki：“三维边界铺设的 3D 计算机图形学”理论与应用力学。

N.Nishikawa,and T.Suzuki: "New Visualization Technique for Three Dimensional Flow" Transactions of Japan Soc.for Aeronautical & Space Sciences. 31. (1988)

N.Nishikawa 和 T.Suzuki：“三维流动的新可视化技术” 日本航空学会会刊

Nobuhide NISHIKAWA;Akira SUZUKI: Proc.3rd Asian Congress of Fluid Mechanics. 694-697 (1986)

Nobuhide NISHIKAWA；Akira SUZUKI：Proc.第三届亚洲流体力学大会。

N.Nishikawa and A.Suzuki: "Computer Graphic Images of 3-D Flows (in Japanese)" Flow Visualization. 6. 67-70 (1986)

N.Nishikawa 和 A.Suzuki：“3D 流的计算机图形图像（日语）”流可视化。

西川進栄,秋山聡,鈴木敬史: NICOGRAPH,86講演論文集. 151-158 (1986)

Shinei Nishikawa、Satoshi Akiyama、Takashi Suzuki：NICOGRAPH，86 讲座记录 151-158 (1986)。