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Turbulent flow characteristics in a rectangular channel under the influence of cube-mounted rough bed
This study was undertaken to examine the effect of bottom roughness on the first- and the second-order turbulence statistics at a high Reynolds number. The artificially generated roughness was consists of cubes equally placed to one another along a longitudinal and lateral direction and the height of the cubes (k) occupies 12.5% of the depth of flow (h). Two roughness separations P/k = 5 and 9 were examined and compared with the result that obtained over a flat surface. Here, P is the pitch between consecutive roughness elements. For each case, three-component velocity measurements were obtained using a micro-acoustic Doppler velocimeter at the flume centerline which allows examination of the large variations of the turbulence intensities, Reynolds shear stress, eddy viscosity, and mixing length below the roughness top. In this region, the flow is more directly influenced by the shear layers from the preceding cube. Spectra analysis was also performed to obtain the oscillation pattern that affects the turbulent properties below and above the roughness.
Turbulent flow characteristics in a rectangular channel under the influence of cube-mounted rough bed
This study was undertaken to examine the effect of bottom roughness on the first- and the second-order turbulence statistics at a high Reynolds number. The artificially generated roughness was consists of cubes equally placed to one another along a longitudinal and lateral direction and the height of the cubes (k) occupies 12.5% of the depth of flow (h). Two roughness separations P/k = 5 and 9 were examined and compared with the result that obtained over a flat surface. Here, P is the pitch between consecutive roughness elements. For each case, three-component velocity measurements were obtained using a micro-acoustic Doppler velocimeter at the flume centerline which allows examination of the large variations of the turbulence intensities, Reynolds shear stress, eddy viscosity, and mixing length below the roughness top. In this region, the flow is more directly influenced by the shear layers from the preceding cube. Spectra analysis was also performed to obtain the oscillation pattern that affects the turbulent properties below and above the roughness.
Turbulent flow characteristics in a rectangular channel under the influence of cube-mounted rough bed
Singh, Santosh Kumar (author) / Debnath, Koustuv (author)
ISH Journal of Hydraulic Engineering ; 23 ; 167-176
2017-05-04
10 pages
Article (Journal)
Electronic Resource
English
ADV , cubes , roughness , open-channel flow , turbulence , spectra
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