Model for propagation speed in turbulent channel flows

J. Pei, J. Chen, Z. S. She, F. Hussain

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

The propagation speed V c of the streamwise velocity fluctuations u in turbulent channel flows is calculated using direct numerical simulation (DNS) data at four Mach numbers (M=0, 0.8, 2.0, and 3.0). The profiles of V c are shown to display remarkable similarity at different M. Quantitative models are developed based on a statistical structure called Velocity-Vorticity Correlation Structure (VVCS), defined as the vorticity region most correlated to velocity fluctuations at a fixed location. Good agreement with DNS-measured propagation velocities is obtained throughout the channel and for all M. The result confirms earlier speculation that the near-wall propagation is due to an advection by coherent vortex structures, and validates the concept of the VVCS.

Original languageEnglish
Article number046307
JournalPhysical Review E - Statistical, Nonlinear, and Soft Matter Physics
Volume86
Issue number4
DOIs
StatePublished - Oct 10 2012

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