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

Published online by Cambridge University Press:  20 May 2020

T. O. Jelly Open the ORCID record for T. O. Jelly [Opens in a new window] ,
R. C. Chin ,
S. J. Illingworth Open the ORCID record for S. J. Illingworth [Opens in a new window] ,
J. P. Monty ,
I. Marusic Open the ORCID record for I. Marusic [Opens in a new window]  and
A. Ooi
T. O. Jelly*
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria3010, Australia
R. C. Chin
Affiliation:
School of Mechanical Engineering, University of Adelaide, South Australia5005, Australia
S. J. Illingworth
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria3010, Australia
J. P. Monty
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria3010, Australia
I. Marusic
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria3010, Australia
A. Ooi
Affiliation:
Department of Mechanical Engineering, University of Melbourne, Victoria3010, Australia
*
† Email address for correspondence: tom.jelly@unimelb.edu.au
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Abstract

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 region retains its self-similar functional form under pulsatile rough-wall conditions, and, as a result, Townsend’s outer-layer similarity hypothesis holds for the roughness-forcing combinations considered here. On the other hand, the unsteady cases exhibit a rich array of flow physics in the region beneath the roughness crests not observed in the steady case. These differences are examined using a Moody chart, which encapsulates how the hydraulic properties of pulsatile rough-wall pipe flow differ from their non-pulsatile counterpart.

JFM classification

Turbulent Flows: Shear layer turbulence Turbulent Flows: Turbulence simulation Boundary Layers: Pipe flow boundary layer
Type
JFM Rapids
Information
Journal of Fluid Mechanics , Volume 895 , 25 July 2020 , R3
Copyright
© The Author(s), 2020. Published by Cambridge University Press

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