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

Christian E. Willert, Julio Soria, Michel Stanislas, Joachim Klinner, Omid Amili, Michael Eisfelder, Christophe Cuvier, Gabriele Bellani, Tommaso Fiorini, Alessandro Talamelli

Research output: Contribution to journalArticleResearchpeer-review

39 Citations (Scopus)


This paper reports on 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.

Original languageEnglish
Article numberR5
Number of pages11
JournalJournal of Fluid Mechanics
Publication statusPublished - 10 Sep 2017


  • pipe flow boundary layer
  • turbulent boundary layers

Cite this