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    Direct numerical simulation of high aspect ratio spanwise-aligned bars

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    Author
    MacDonald, M; Ooi, A; Hutchins, N; Chung, D
    Date
    2017-01-01
    Source Title
    10th International Symposium on Turbulence and Shear Flow Phenomena, TSFP 2017
    University of Melbourne Author/s
    Hutchins, Nicholas; Ooi, Andrew; Chung, Daniel; MacDonald, Michael
    Affiliation
    Mechanical Engineering
    Metadata
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    Document Type
    Conference Paper
    Citations
    MacDonald, 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,
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/252860
    Open Access URL
    http://www.tsfp-conference.org/proceedings/2017/2/139.pdf
    Abstract
    We 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.

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