Near-wall statistics of the CICLoPE turbulent pipe flow at shear Reynolds numbers up to 40 000.

The data presented here are the first and second order statistics of near-wall two-component–two-dimensional (2C–2D) particle image velocimetry (PIV) measurements of a turbulent pipe flow at shear Reynolds numbers up to acquired in the CICLoPE facility of the University of Bologna. The 111.5 m long pipe of 900 mm diameter offers a well-established turbulent flow with viscous length scales ranging from at down to at . These length scales can be resolved with a high-speed PIV camera at image magnification near unity. Statistically converged velocity profiles were determined using multiple sequences of up to 70 000 PIV recordings acquired at sampling rates of 100 Hz up to 10 kHz. Analysis of the velocity statistics shows a well-resolved inner peak of the streamwise velocity fluctuations that grows with increasing Reynolds number and an outer peak that develops and moves away from the inner peak with increasing Reynolds number.DATAFILES:ASCII tecplot files (include additional experimental information as comments)profile_u05mps.dat: Re_tau = 5,383profile_u10mps.dat: Re_tau = 11,708profile_u20mps.dat: Re_tau = 19,918profile_u30mps.dat: Re_tau = 27,983profile_u40mps.dat: Re_tau = 39,944PUBLICATION:The experiment and turbulent velocity statistics has been reported in the archival literature: Christian E. Willert, Julio Soria, Michel Stanislas, Joachim Klinner, Omid Amili, Michael Eisfelder, Christophe Cuvier, Gabriele Bellani, Tommaso Fiorini and Alessandro Talamelli (2017). Near-wall statistics of a turbulent pipe flow at shear Reynolds numbers up to 40 000. Journal of Fluid Mechanics, 826, R5. doi:10.1017/jfm.2017.498. Note: when referring to this data this journal publication must be referred to as well.

本数据集包含在博洛尼亚大学CICLoPE实验装置中获取的、剪切雷诺数（shear Reynolds number, Re_tau）最高达40000的湍流管流近壁面双分量二维（two-component–two-dimensional, 2C-2D）粒子图像测速（Particle Image Velocimetry, PIV）测量所得的一阶与二阶统计量。该管道总长111.5m，管径900mm，可形成充分发展的湍流流场，其粘性长度尺度（viscous length scales）范围为[原文缺失数值]，在[原文缺失剪切雷诺数]时为[原文缺失长度值]，在[原文缺失剪切雷诺数]时降低至[原文缺失长度值]。该粘性长度尺度可通过成像放大倍率接近1的高速PIV相机（high-speed PIV camera）进行有效分辨。研究通过多组最高达70000帧的PIV录制序列（采样率范围为100Hz至10kHz），得到了统计收敛的速度剖面。对速度统计量的分析表明，流向速度脉动（streamwise velocity fluctuations）存在分辨率优异的内峰（inner peak），该内峰随雷诺数升高而逐渐增强；同时存在外峰（outer peak），其随雷诺数升高逐步形成并远离内峰。

数据文件：ASCII格式Tecplot文件（文件注释中包含额外实验信息）
profile_u05mps.dat：剪切雷诺数Re_tau=5383
profile_u10mps.dat：剪切雷诺数Re_tau=11708
profile_u20mps.dat：剪切雷诺数Re_tau=19918
profile_u30mps.dat：剪切雷诺数Re_tau=27983
profile_u40mps.dat：剪切雷诺数Re_tau=39944

相关文献：本实验及湍流速度统计量的相关研究已发表于正式存档学术期刊：Christian E. Willert、Julio Soria、Michel Stanislas、Joachim Klinner、Omid Amili、Michael Eisfelder、Christophe Cuvier、Gabriele Bellani、Tommaso Fiorini与Alessandro Talamelli（2017）。论文题为《剪切雷诺数最高达40000的湍流管流近壁面统计特性》，发表于《流体力学杂志》（Journal of Fluid Mechanics），826卷，R5。DOI:10.1017/jfm.2017.498。注意：引用本数据集时需同时引用该期刊论文。