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https://hdl.handle.net/2440/119257
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DC Field | Value | Language |
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dc.contributor.author | Jelly, T. | - |
dc.contributor.author | Chin, R. | - |
dc.contributor.author | Illingworth, S. | - |
dc.contributor.author | Monty, J. | - |
dc.contributor.author | Marusic, I. | - |
dc.contributor.author | Ooi, A. | - |
dc.contributor.editor | Lau, T. | - |
dc.contributor.editor | Kelso, R. | - |
dc.date.issued | 2018 | - |
dc.identifier.citation | 21st Australasian Fluid Mechanics Conference, 2018 / Lau, T., Kelso, R. (ed./s), pp.1-4 | - |
dc.identifier.isbn | 9780646597843 | - |
dc.identifier.uri | http://hdl.handle.net/2440/119257 | - |
dc.description.abstract | The physics of pulsatile rough-wall turbulent pipe flow is investigated using data from direct numerical simulation (DNS). Three geometrically-scaled sinusoidal roughness topographies are considered — the amplitude and wavelength of each surface are systematically varied whilst holding their amplitude-towavelength ratio constant. Pulsation is achieved by imposing a time-harmonic axial pressure gradient. The resulting flow-field is triple phase-averaged (in two spatial directions and also in time) which permits a quadruple decomposition of the instantaneous field variables to be invoked. The four components of the quadruple decomposition are: (i) a global-averaged mean component; (ii) a steady roughness-induced fluctuation; (iii) an unsteady pulsation-induced fluctuation and (iv) the remaining turbulent fluctuation. We compare statistics of (i)-(iv) against their non-pulsatile counterpart using past results from related work [1, 2]. Whilst the pulsatile and non-pulsatile data collapse well in the outer region, clear differences are observed in the near-roughness region. In particular, profiles of the mean axial velocity, roughness-induced stress and turbulence-induced stress exhibit consistently lower magnitudes below the roughness crests under pulsatile conditions. | - |
dc.description.statementofresponsibility | T. O. Jelly, R. C. Chin, S. J. Illingworth, J. P. Monty, L. Marusic and A. S. H. Ooi | - |
dc.language.iso | en | - |
dc.publisher | Australasian Fluid Mechanics Society | - |
dc.rights | Commencing with 19AFMC, the Society holds copyright to papers which appear in the Proceedings. Prior to that, copyright resides with authors of the papers. | - |
dc.title | Quadruple decomposition of current-dominated pulsatile rough-wall turbulent pipe flow | - |
dc.type | Conference paper | - |
dc.contributor.conference | Australasian Fluid Mechanics Conference (10 Dec 2018 - 13 Dec 2018 : Adelaide, Australia) | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/LP150100233 | - |
dc.relation.grant | http://purl.org/au-research/grants/arc/DE180100157 | - |
pubs.publication-status | Published | - |
dc.identifier.orcid | Chin, R. [0000-0002-2709-4321] | - |
Appears in Collections: | Aurora harvest 8 Mechanical Engineering conference papers |
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