2015
DOI: 10.1017/jfm.2015.172
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A systematic investigation of roughness height and wavelength in turbulent pipe flow in the transitionally rough regime

Abstract: Direct numerical simulations (DNS) are conducted for turbulent flow through pipes with three-dimensional sinusoidal roughnesses explicitly represented by body-conforming grids. The same viscous-scaled roughness geometry is first simulated at a range of different Reynolds numbers to investigate the effects of low Reynolds numbers and low R 0 /h, where R 0 is the pipe radius and h is the roughness height. Results for the present class of surfaces show that the Hama roughness function U + is only marginally affec… Show more

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Cited by 169 publications
(274 citation statements)
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“…Similar observations were made for the sinusoidally patterned pipe surfaces studied in the DNS by Chan et al (2015), which also showed a relatively steep increase of the roughness function with k + s in the upper transitionally rough region, as observed for the current simulations.…”
Section: Roughness Functionsupporting
confidence: 88%
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“…Similar observations were made for the sinusoidally patterned pipe surfaces studied in the DNS by Chan et al (2015), which also showed a relatively steep increase of the roughness function with k + s in the upper transitionally rough region, as observed for the current simulations.…”
Section: Roughness Functionsupporting
confidence: 88%
“…Computational resources thus limit both the scale of the roughness, since very small roughness features would be difficult to resolve, and the attainable Reynolds numbers. Most previous DNS of turbulent flow over rough surfaces have also been conducted at δ/k 40 Napoli, Armenio & De Marchis 2008;Orlandi & Leonardi 2008;Chau & Bhaganagar 2012;Chan et al 2015). As is shown in the following, close to universal behaviour of the mean flow in the outer layer can still be observed at this δ/k ratio.…”
Section: Methodssupporting
confidence: 62%
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“…Relatively few DNS studies over a wide range of k + s of roughness exist, mainly due to limitations on the computational resources that are required to conduct high-Reynolds-number simulations necessary to achieve fully rough flow. For sinusoidal pipe roughness, Chan et al (2015) used body conforming grids to study the effect of height and wavelength. An extensive DNS study was published recently by , where a comparison of the near-wall flow for two realistic irregular rough surfaces, a graphite surface and a grit-blasted surface (which is also being studied in the current paper), was made for a wide Reynolds number range.…”
Section: Introductionmentioning
confidence: 99%