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- W165366924 abstract "Experiments were performed on a surface consisting of sparsely-distributed rigid circular cylinder roughness elements to examine the effects of sparseness on turbulence structure. Measurements were made using both twocomponent LDV and wide-field planar PIV techniques. The mean velocity profile in defect form conforms to outer-layer similarity. The streamwise and wall-normal turbulence intensities appear to exhibit outer-layer similarity for y > 3ks. However, the Reynolds shear stress is consistently higher compared to smooth-wall as well as other rough-wall data. The higher shear stress appear to be linked with strong ejection events that characterise the outer region of the flow. Twopoint spatial correlations of both streamwise and wall-normal velocity fluctuations indicate that the turbulent structures in the outer region are coherent over much larger streamwise distances compared to smooth and other rough-wall cases. These results point to the fact that sparseness plays an important role in the outer-layer structure of turbulent boundary layers over rough walls." @default.
- W165366924 created "2016-06-24" @default.
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- W165366924 date "2011-01-01" @default.
- W165366924 modified "2023-10-18" @default.
- W165366924 title "TURBULENT BOUNDARY LAYER STRUCTURE OVER SPARSELY-DISTRIBUTED ROUGHNESS" @default.
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- W165366924 doi "https://doi.org/10.1615/tsfp7.630" @default.
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