RT Journal Article
T1 Characterization of very-large-scale motions in high-Re pipe flows
A1 Discetti, Stefano
A1 Bellani, Gabriele
A1 Orlu, Ramis
A1 Serpieri, Jacopo
A1 Sanmiguel Vila, Carlos
A1 Raiola, Marco
A1 Zheng, Xiaobo
A1 Mascotelli, Lucia
A1 Talamelli, Alessandro
A1 Ianiro, Andrea
AB 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.
PB Elsevier
SN 0894-1777
YR 2019
FD 2019-06
LK https://hdl.handle.net/10016/32586
UL https://hdl.handle.net/10016/32586
LA eng
DS e-Archivo
RD 1 sept. 2024