Characteristics of Turbulent Boundary Layr with 3-dimensional Separation

三维分离湍流边界层特征

• 批准号: 06302063
• 负责人: SUZUKI Toshio
• 金额: $ 9.54万
• 依托单位: Osaka University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 1994
• 资助国家: 日本
• 起止时间: 1994 至 1996
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-06302063/
• 关键词: 3-Dimensional Hot Wire; Evaluation of Turbulence Model; Distributions of Reynolds Stresses; 3-Dimensional Separation; Turbulence Data-base around Stern Flow Field; 肥大船船尾流場; レイノルズ応力; 乱流モデル; 速度変動の位相差; 長周期変動; 熱線流速計の精度確認; 乱動計測; 船尾近傍の乱流場; 伴流内の周波数解

Characteristics of the turbulence with longitudinal vortices and deformation of boundary layr, due to the existence of the vortices are investigated.Obtained results are as follows ;1. Characteristic of 3-dimensional turbulent flow around a fine ship model (Series 60, CB=0.6) and a full ship form (Ryuko-Maru) were investigated experimentally. The results are,(1) Accurate data-base for 3-D averaged velocity components, vortices and Reynolds stress distributions are obtained.(2) Position of the peak value of longitudinal vortices are not correspond to the peak of Reynolds stress and turbulence strength are weak inside of the longitudinal vortices.(3) Wake distribution is deformed by vortices which was caused by 3-D separation near the stern bilge.(4) Phase of fluctuation between the velocity inside of the longitudinal vortices and the outer region of the vortices are differ each other. Strong correlation between the fluctuations of the area of longitudinal vortices and fluctuations of x-component of velocity are recognized.(5) Estimated normal stress components using Boussinesq's hypothesis are well coincident with experimental results but shear stress components are not coincident.(6) Turbulence model based on the Boussinesq's hypothesis underestimate the shearing stress and the damping method for the kinematic eddy viscosity by helicity underestimate more the shearing stresses.2. CFD calculations are carried out and the results show qualitative agreement with experimental results, i.e.weak deformation of the wake distribution is calculated.3. Shearing stress components on the hull surface are measured by image processing technique.4. Bow wave breaking are calculated with the zero tangential stress conditions on the free surface.

研究了具有纵向涡的湍流特性以及由于纵向涡的存在而引起的边界层变形。得到的结果如下：1。对细船型（60系列，CB=0.6）和全船型（龙子丸）的三维湍流特性进行了实验研究。结果表明：(1)获得了三维平均速度分量、涡旋和雷诺应力分布的精确数据库。(2)纵向涡的峰值位置与雷诺应力峰值不对应，纵向涡内部湍流强度较弱。(3)尾迹分布受尾舱附近三维分离引起的涡的影响。(4)纵向涡旋内部和涡旋外部的速度波动相位不同。纵向涡面积的波动与速度x分量的波动之间存在很强的相关性。(5)利用Boussinesq假设估计的法向应力分量与实验结果吻合较好，但剪应力分量不吻合。(6)基于Boussinesq假设的湍流模型低估了剪切应力，而基于螺旋度的运动涡流粘度阻尼法更低估了剪切应力。进行了CFD计算，计算结果与实验结果基本一致，即计算出了尾流分布的弱变形。采用图像处理技术测量船体表面的剪应力分量。在自由表面的切向应力为零的条件下，计算了船首波破碎。

项目成果

奥野 武俊: "油膜を用いた限界流線と壁面摩擦応力の計測" 日本造船学会論文集. 第176号. 59-65 (1998)

Taketoshi Okuno：“使用油膜测量临界流线和壁摩擦应力”日本造船学会汇刊第 176. 59-65 (1998)。

Toshio SUZUKI,Hiroyoshi SUZUKI,Satoshi MIYAZAKI: "Study on Reynolds Stress Distributions in a Stern Flow Field" Journal of the Japan Society of Fluid Mechanics. Vol.16-Suppl.137. (1) -138 (2) (1997)

Toshio SUZUKI、Hiroyoshi SUZUKI、Satoshi MIYAZAKI：“Study on Reynolds Stress Distributions in a Stern Flow Field”日本流体力学学会杂志。

Yasuhiko SUGII,Taketoshi OKUNO,Shigeru NISHIO: "Image Measurement using Governing Equation of Fluid Flow (2nd report)" Journal of the Visualization Society of Japan. Vol.16-Suppl.No.2. 55-58 (1996)

Yasuhiko SUGII、Taketoshi OKUNO、Shigeru NISHIO：“使用流体流动控制方程进行图像测量（第二次报告）”日本可视化学会杂志。

皇甫 承勉: "Numerical Investigation on Wave Reduction by Wing Attached to Hull" 日本造船学会講演論文集. vol.177. 41-48 (1995)

Shugen Kofu：“船体附属机翼减少波浪的数值研究”日本造船学会论文集第 177 卷（1995 年）。

杉井 康彦: "流場モデルを用いた速度場の画像計測" 可視化情報学会誌. Vol.16 Spl-No.1. 207-210 (1996)

Yasuhiko Sugii：“使用流场模型进行速度场的图像测量”可视化信息学会杂志第 16 卷 Spl-No.1（1996 年）。