Journal article

A direct comparison of pulsatile and non-pulsatile rough-wall turbulent pipe flow

TO Jelly, RC Chin, SJ Illingworth, JP Monty, I Marusic, A Ooi

Journal of Fluid Mechanics | Cambridge University Press (CUP) | Published : 2020


Pulsatile rough-wall turbulent pipe flow is compared against its non-pulsatile counterpart using data obtained from direct numerical simulation. Results are presented at a mean friction Reynolds number of 540 for a set of three geometrically scaled roughness topographies at a single forcing condition, which, based on existing classifications, falls into the current-dominated very-high-frequency regime. By comparing the pulsatile data against an equivalent non-pulsatile dataset (Chan et al., J. Fluid Mech., vol. 854, 2018, pp. 5–33), the key differences (and similarities) between the forced and unforced configurations are identified. A major finding of this study is that the flow in the outer..

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