Prediction and Control of Turbulence Based on Turbulent Elementary Vortices

基于湍流基本涡的湍流预测与控制

• 批准号: 12125202
• 负责人: MIYAUCHI Toshio
• 金额: $ 44.35万
• 依托单位: Tokyo Institute of Technology (2002-2003)Osaka University (2000-2001)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research on Priority Areas
• 财政年份: 2000
• 资助国家: 日本
• 起止时间: 2000 至 2002
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-12125202/
• 关键词: Turbulence; Vortex; Elementary Vortex; Direct Numerical Simulation; Micro-machine; Drag Reduction; Turbulence Controls; Laser Diagnosis; 流体工学; 熱工学; エネルギー効率化; ハイパフォーマンスコンピューティング; 直接数値シミュレーション; 抵抗削減; 画像処理計測

To understand elementary vortex in turbulence and to apply it for engineering problems, characteristics of the elementary vortex in various turbulent flows are investigated by direct numerical simulations. It is shown that the characteristics of the elementary vortex are independent of a type of turbulent flows and Reynolds number, and that they create large-scale clusters in high Reynolds number turbulence. Large scale DNS of plane-channel flow reveals that vortices in near-wall region are universal and that the far-wall field is characterized by streaky structures. In addition, such a structure was not sustained but roll-cell vortices appeared in the numerical experiment, in which spanwise width of computational domain was strictly restricted. Scalar transport mechanism by the elementary vortex and fractal characteristics of scalar surface in turbulence are also clarified. R&D studies on active feedback control of wall turbulence are performed by using DNS. Investigation on the Reyno … More lds number dependency of the control effect reveals the effectiveness of the proposed control for high Reynolds number flows appearing in real applications, too. It is shown that the existing control algorithms are also valid for a turbulent pipe flow, and we demonstrate the possibility of drag reduction based on the information measurable on the walls only. A prototype feedback control system with arrayed sensor and deformable-membrane-type magnetic actuators placed in a matrix is also developed and evaluated. Turbulent flow fields modulated by additives, manipulation at the wall or pressure gradient were investigated by means of DNS. Namely, influences of the non-uniformity of particle distribution and particle rotation in particle-laden flows, effect of fabric planting, and spatially developing field with acceleration or deceleration were analyzed. To develop new SGS model, hierarchical structure of turbulence and energy transfer mechanism between different scales are investigated using DNS of high Reynolds number turbulence. Less

为了更好地理解湍流中的基元涡并将其应用于工程问题，本文采用直接数值模拟的方法研究了各种湍流中基元涡的特性。结果表明，基本涡的特性是独立的湍流的类型和雷诺数，它们创建大规模的集群在高雷诺数湍流。大尺度平面槽道流的数值模拟结果表明，近壁区涡是普遍存在的，而远壁区流场具有明显的条纹结构。另外，在严格限制计算区域展向宽度的数值实验中，这种结构并没有得到维持，而是出现了卷胞涡。阐明了基本涡的标量输运机制和湍流中标量表面的分形特征。利用DNS进行了壁面湍流主动反馈控制的研究与开发。关于Reyno的调查 ...更多信息 控制效果的lds数依赖性揭示了所提出的控制对于出现在真实的应用中的高雷诺数流动的有效性。结果表明，现有的控制算法也是有效的湍流管流，我们证明了基于可测量的信息的墙壁上的阻力降低的可能性。一个原型反馈控制系统与阵列传感器和变形膜型磁致动器放置在一个矩阵也开发和评估。利用DNS方法研究了添加剂、壁面操纵和压力梯度对湍流流场的调制作用。即，颗粒分布的不均匀性和颗粒旋转的颗粒载流，织物种植的效果，并与加速或减速的空间发展领域的影响进行了分析。为了发展新的SGS模型，本文利用高雷诺数湍流的直接数值模拟方法，研究了湍流的层次结构和不同尺度间的能量传递机制。少

项目成果

M.Tanahashi, M.Fujimura, T.Miyauchi: "Coherent Fine Scale Eddies in Turbulent Premixed Flames"Proc. Combust. Inst.. Vol.28. 529-535 (2000)

M.Tanahashi、M.Fujimura、T.Miyauchi：“湍流预混合火焰中的相干细尺度涡流”Proc。

M.Tanahashi, S.Iwase, T.Miyauchi: "Appearance and Alignment with Strain Rate of Coherent Fine Scale Eddies in Turbulent Mixing Layer"Journal of Turbulence. Vol.2, PN006. 1-17 (2001)

M.Tanahashi、S.Iwase、T.Miyauchi：“湍流混合层中相干细尺度涡流的外观和与应变率的对准”湍流杂志。

Iwamoto, K., Suzuki, Y., Kasagi, N.: "Reynolds Number Effect on Wall Turbulence : Toward Effective Feedback Control"Int.J. Heat and Fluid Flow. 23. 678-689 (2002)

Iwamoto, K.、Suzuki, Y.、Kasagi, N.：“壁面湍流的雷诺数效应：实现有效的反馈控制”Int.J.

梶島岳夫: "粒子クラスターの形成と崩壊における粒子回転の効果"日本混相流学会年会2002講演論文集. 69-70 (2002)

Takeo Kajishima：“粒子旋转对粒子簇形成和崩溃的影响”日本多相流学会年会论文集 2002. 69-70 (2002)

Y.Li: "Sound Generation in Compressible Mixing Layers"JSME International Journal, Series B. 44・4. 505-512 (2001)

Y.Li：“可压缩混合层中的声音生成”JSME 国际期刊，系列 B. 44・4（2001）。