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dc.contributor.authorMacDonald, M
dc.contributor.authorOoi, A
dc.contributor.authorHutchins, N
dc.contributor.authorChung, D
dc.date.accessioned2020-12-07T11:04:22Z
dc.date.available2020-12-07T11:04:22Z
dc.date.issued2017-01-01
dc.identifier.citationMacDonald, M., Ooi, A., Hutchins, N. & Chung, D. (2017). Direct numerical simulation of high aspect ratio spanwise-aligned bars. 10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017, 3, pp.126-155. https://doi.org/10.1017/jfm.2018.150.
dc.identifier.isbn9780000000002
dc.identifier.issn0022-1120
dc.identifier.urihttp://hdl.handle.net/11343/252860
dc.description.abstractWe conduct minimal-channel direct numerical simulations of turbulent flow over two-dimensional rectangular bars aligned in the spanwise direction. This roughness has been often described as dtype, as the roughness function ΔU+ is thought to depend only on the outer-layer length scale (pipe diameter, channel half height or boundary layer thickness). This is in contrast to conventional engineering rough surfaces, named k-type, for which ΔU+ depends on the roughness height, k. The minimal-span rough-wall channel is used to circumvent the high cost of simulating high Reynolds number flows, enabling a range of bars with varying aspect ratios to be investigated. The present results show that increasing the trough-to-crest height (k) of the roughness while keeping the width between roughness bars, W, fixed in wall units, results in non-k-type behaviour. The roughness function appears to scale with W, suggesting that this is the only relevant parameter for very deep rough surfaces with k/W≥ 3. In these situations, the flow no longer has any information about how deep the roughness is and instead can only 'see' the width of the fluid gap between the bars.
dc.titleDirect numerical simulation of high aspect ratio spanwise-aligned bars
dc.typeConference Paper
dc.identifier.doi10.1017/jfm.2018.150
melbourne.affiliation.departmentMechanical Engineering
melbourne.source.titleJournal of Fluid Mechanics
melbourne.source.volume3
melbourne.source.pages126-155
melbourne.elementsid1275272
melbourne.openaccess.urlhttp://www.tsfp-conference.org/proceedings/2017/2/139.pdf
melbourne.openaccess.statusPublished version
melbourne.contributor.authorHutchins, Nicholas
melbourne.contributor.authorOoi, Andrew
melbourne.contributor.authorChung, Daniel
melbourne.contributor.authorMacDonald, Michael
melbourne.accessrightsOpen Access


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