Journal article

Forcing frequency effects on turbulence dynamics in pulsatile pipe flow

Z Cheng, TO Jelly, SJ Illingworth, I Marusic, ASH Ooi

International Journal of Heat and Fluid Flow | Elsevier | Published : 2020


The turbulence dynamics of pulsatile pipe flow are investigated using direct numerical simulation (DNS) at a mean friction Reynolds number of 180. Results are presented for a range of forcing frequencies at a fixed amplitude, which, based on existing classifications, corresponds to the current-dominated regime. This work directs attention towards the phase-variations of single and two-point turbulence statistics, with a particular emphasis on the response of the Reynolds shear stress to systematic changes in the applied forcing frequency. The study has yielded two key outcomes. (i) A new frequency classification procedure for pulsatile turbulent flows (at low-to-moderate friction Reynolds nu..

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