Characterization of very-large-scale motions in high-Re pipe flows

Stefano Discetti*, Gabriele Bellani, Ramis Örlü, Jacopo Serpieri, Carlos Sanmiguel Vila, Marco Raiola, Xiaobo Zheng, Lucia Mascotelli, Alessandro Talamelli, Andrea Ianiro

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

11 Citations (Scopus)

Abstract

Very-large-scale structures in pipe flows are characterized using an extended Proper Orthogonal Decomposition (POD)-based estimation. Synchronized non-time-resolved Particle Image Velocimetry (PIV) and time-resolved, multi-point hot-wire measurements are integrated for the estimation of turbulent structures in a pipe flow at friction Reynolds numbers of 9500 and 20000. This technique enhances the temporal resolution of PIV, thus providing a time-resolved description of the dynamics of the large-scale motions. The experiments are carried out in the CICLoPE facility. A novel criterion for the statistical characterization of the large-scale motions is introduced, based on the time-resolved dynamically-estimated POD time coefficients. It is shown that high-momentum events are less persistent than low-momentum events, and tend to occur closer to the wall. These differences are further enhanced with increasing Reynolds number.
Original languageEnglish
Pages (from-to)1-8
Number of pages8
JournalExperimental Thermal and Fluid Science
Volume104
DOIs
Publication statusPublished - 2019

Keywords

  • Boundary layer
  • Pipe flow
  • POD
  • Very-large-scale motions

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