Pressure statistics and fine vortex structure in Turbulence

湍流中的压力统计和精细涡流结构

• 批准号: 15560137
• 负责人: TSUJI Yoshiyuki
• 金额: $ 2.37万
• 依托单位: Nagoya University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2003
• 资助国家: 日本
• 起止时间: 2003 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560137/
• 关键词: Turbulence; Static pressure; Fine vortex structure; Universal scaling law

Pressure fluctuation was measured in a turbulent jet using a condenser microphone and piezoresistive transducer. The power-law exponent and proportional constant of normalized pressure spectrum are discussed from the standpoint of Kolmogorov universal scaling. The clear power-law with scaling exponent close to -7/3 was confirmed in the range of 600<R_λ. These Reynolds numbers are much larger than those in velocity fluctuation to achieve Kolmogorov scaling. The spectral constant is not universal but depends on Reynolds numbers. Measured pressure PDFs are compared with direct numerical simulation.New methods and improved measurement techniques are thus sought for. In this study, both static pressure and wall pressure in turbulent boundary layers have been measured simultaneously by using small transducer and microphone. Obtained results may be summarized as follows.(1)The root mean square of vertical velocity component is evaluated by means of mean pressure distribution The profile is su … More fficiently agree with the result obtained by direct v-component velocity measurement.The peak location of v^+ is scaled as a function of Reynolds number ; y_p^+=0.00135 times R_θ^1.42.(2)Root mean square of wall pressure, normalized by inner variable, indicates an increasing function of R_θ ; p_rms^+∝R_θ^0.28. This trend is similar with the result by DNS.(3)The distribution of static pressure r.m.s., p_rms^+, across the boundary layer does not show the Reynolds number scaling. If p_rms^+ is averaged within the log-region, its Reynolds number dependence is approximated by the power-law ; p_rms^+∝R_θ^0.32. This Reynolds number dependence is much stronger than that of stream-wise velocity or vertical velocity component.(4)The correlation between wall and static pressure across the boundary layer indicates the positive value. The distribution of correlation coefficient does not show the Reynolds number dependence if the distance from the wall is normalized by Δ for R_θ>7000.(5)In relation to streamwise velocity u, the root mean square of static pressure is scaled by ρu_rms^2. The ratio p_rms/ρu_rms^2 is the order of 1 in the inner region. The correlation between the pressure and streamwise velocity indicates the local minimum and maximum value at y/Δ=0.05 and y/Δ=0.2,respectively. In the outer region, 0.25<y/Δ, the correlation becomes negative. These trends are observed in DNS. Less

使用电容式麦克风和压阻传感器测量湍流射流中的压力波动。从柯尔莫哥洛夫通用标度的角度讨论了归一化压力谱的幂律指数和比例常数。在600<R_λ范围内，证实了清晰的幂律，标度指数接近-7/3。这些雷诺数比速度波动中的雷诺数大得多，以实现柯尔莫哥洛夫缩放。光谱常数不是通用的，而是取决于雷诺数。将测得的压力 PDF 与直接数值模拟进行比较。因此寻求新的方法和改进的测量技术。在这项研究中，使用小型传感器和麦克风同时测量了湍流边界层中的静压力和壁压力。得到的结果可概括如下：(1)通过平均压力分布评估垂直速度分量的均方根，该剖面与直接v分量速度测量获得的结果非常吻合。v^+的峰值位置被缩放为雷诺数的函数； y_p^+=0.00135乘以R_θ^1.42。(2)壁压均方根，经内变量归一化，表示R_θ的增函数； p_rms^+∝R_θ^0.28。这一趋势与DNS的结果类似。(3)边界层上的静压均方根p_rms^+的分布没有表现出雷诺数缩放。如果 p_rms^+ 在对数区域内求平均值，则其雷诺数依赖性由幂律近似； p_rms^+∝R_θ^0.32。这种雷诺数依赖性比流向速度或垂直速度分量的依赖性强得多。(4)壁面压力和边界层静压力之间的相关性显示为正值。当R_θ>7000时，如果距壁面的距离用Δ归一化，则相关系数的分布不显示雷诺数依赖性。(5)相对于流向速度u，静压的均方根按ρu_rms^2缩放。内部区域中的比率 p_rms/ρu_rms^2 约为 1。压力和流向速度之间的相关性分别表明y/Δ=0.05和y/Δ=0.2处的局部最小值和最大值。在外部区域，0.25<y/Δ，相关性变为负值。 DNS 中观察到了这些趋势。较少的

项目成果

Universality of probability density distributions in the overlap region in high Reynolds number turbulent boundary layers

• DOI: 10.1063/1.1738416
• 发表时间: 2004-06
• 期刊: Physics of Fluids
• 影响因子: 4.6
• 作者: B. Lindgren;A. Johansson;Y. Tsuji

Mean wind in convective turbulence of mercury

• DOI: 10.1103/physrevlett.94.034501
• 发表时间: 2005-01-28
• 期刊: PHYSICAL REVIEW LETTERS
• 影响因子: 8.6
• 作者: Tsuji, Y;Mizuno, T;Sano, M
• 通讯作者: Sano, M

二次元噴流と平行に置かれた平板との衝突により形成される渦構造のスケールと乱れの分布

二维射流与与其平行放置的平板碰撞形成的涡流结构的尺度和湍流分布

• 发表时间: 2004
• 期刊: 日本機械学会論文集(B編) 70/692
• 作者: 河合勇太;辻 義之;久木田 豊
• 通讯作者: 久木田 豊

Large-scale Anisotropy Effect on Small-scale Statistics over Rough Wall Turbulent Boundary Layers

粗糙壁湍流边界层上小尺度统计的大尺度各向异性效应

• 发表时间: 2003
• 期刊: Physics of Fluids 15
• 作者: 河合勇太;辻 義之;久木田 豊;Yoshiyuki Tsuji
• 通讯作者: Yoshiyuki Tsuji

Intermittency Effect on Energy Spectrum in High-Reynolds Number Turbulence

高雷诺数湍流中能谱的间歇效应

• 发表时间: 2004
• 期刊: Physics of Fluids 16-5
• 作者: Keigo Kamitsuji;Koji Morinishi;Nobuyuki Satofuka;森西 晃嗣;森西 晃嗣;森西 晃嗣;Koji Morinishi;Yoshiyuki Tsuji
• 通讯作者: Yoshiyuki Tsuji