Study of the Structure of Wall-Turbulence and Turbulence Noise

壁面湍流结构与湍流噪声的研究

• 批准号: 11305018
• 负责人: MIYAKE Yutaka
• 金额: $ 6.37万
• 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: 1999
• 资助国家: 日本
• 起止时间: 1999 至 2001
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-11305018/
• 关键词: Wall Turbulence; Vortical System; Streaks; Turbulence Noise; Rough Wall; Noise Propagation; Aeroacoustics; CAA; Acoustic source

Several subjects are in concern in this research program. Namely, interaction between near-wall layer up to several tens in wall unit and outer layer, modulation of outer layer which may contribute to drag reduction and turbulence noise emitted from wall turbulence.As for the interaction problem, model simulations under certain artificial conditions revealed that near-wall layer over smooth wall has remarkable self-sustenance ability and universality, independent on the property of outer layer. Roughness on the wall has been found to destruct this property and makes almost whole layer occupied by the property of outer layer. Channel flow having wavy wall has confirmed the conclusion.Outer layer property modulated by solid particles has been investigated as well. New technique invented to trace particles in motion works satisfactorily and revealed important aspects of turbulence dynamics that may be applicable for turbulence control.Noise emitted from turbulence over a wall has been simulated without using any models. Source field and accompanying acoustic field have been consecutively calculated in time-marching manner. It turned out that not all the vortices generate sound but certain particular events of vortex only contribute for noise generation. As the basis of enhancing reliability of noise calculation, free round jet has been simulated with high resolution. Near field of a jet which is most responsible for noise generation has been also investigated with respect to the mechanism of birth of vortical structure, by global stability analysis.

该研究计划中有几个主题引起了关注。也就是说，墙壁单位和外层的近壁层之间的相互作用，外层的调节可能有助于减少墙壁湍流发出的阻力和湍流噪声。相互作用问题，某些人造条件下的模型模拟揭示了平滑壁上的近壁层在光滑的壁上具有出色的自我维持能力和具有出色的自我维持能力，并且具有外层的属性。墙上的粗糙度已被发现破坏了这一特性，并且几乎使整层被外层的特性所占据。带有波浪壁的通道流已经证实了结论。也已经研究了由固体颗粒调制的层层特性。新技术是针对运动粒子在运动工作中令人满意的，并揭示了可能适用于湍流控制的湍流动力学的重要方面。在没有使用任何模型的情况下，已经模拟了从壁上发出的湍流。源场和随附的声场已经以时间级的方式连续计算。事实证明，并非所有的涡流都会产生声音，但是涡旋的某些特定事件仅有助于产生噪声。作为提高噪声计算可靠性的基础，已使用高分辨率模拟了自由圆喷射。通过全球稳定性分析，还研究了有关涡流结构的出生机理的近距离噪声的近场。

项目成果

Miyake, Y., Tsujimoto, K., Nakaji, M.: "Direct numerical simulation of rough-wall heat transfer in a turbulent channel flow"Int. J. Heat and Fluid Flow. 22. 237-244 (2001)

Miyake, Y.、Tsujimoto, K.、Nakaji, M.：“湍流通道流中粗糙壁传热的直接数值模拟”Int。

Miyake, Y: "Direct numerical simulation of rough-wall heat transfer in a turbulent channel flow"Int. J. Heat and Fluid Flow. 22. 237-244 (2001)

Miyake, Y：“湍流通道流中粗糙壁传热的直接数值模拟”Int。

三宅裕, 辻本公一, 中地克: "粗面溝乱流温度場の高解像度数値シミュレーション"日本機械学会論文集B編. 67-658. 1360-1366 (2001)

Yutaka Miyake、Koichi Tsujimoto 和 Masaru Nakachi：“粗糙凹槽中湍流温度场的高分辨率数值模拟”，日本机械工程师学会会议录，B 版 67-658（2001 年）。

K.Tsujimoto and Y.Miyake: "IDENTIFICATION OF STRONG,NEAR-WALL QUASI-STREAMWISE VORTICES AND THEIR BEHAVIOR"Proceedings of the IUTAM Simulation held in Lyngby.Denmark. 25-29 (1997)

K.Tsujimoto 和 Y.Miyake：“强近壁准流涡流的识别及其行为”在丹麦 Lyngby 举行的 IUTAM 模拟会议论文集。

Miyake,Y.,Tsujimoto,K.,Sato,N.and Suzuki,Y.: "Structure of Turbulence in the Logarithmic Layer and its Mechanism"Advances in Turbulence VIII (Kluwer Academic Publisher). 655-658 (2000)

Miyake,Y.、Tsujimoto,K.、Sato,N. 和 Suzuki,Y.：“对数层湍流结构及其机制”湍流进展 VIII（Kluwer 学术出版社）。