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Article

Turbulence in Wall-Wake Flow Downstream of an Isolated Dunal Bedform

1
Physics and Applied Mathematics Unit, Indian Statistical Institute, Kolkata, West Bengal 700108, India
2
Department of Civil Engineering, Indian Institute of Technology Kharagpur, West Bengal 721302, India
*
Author to whom correspondence should be addressed.
Water 2019, 11(10), 1975; https://doi.org/10.3390/w11101975
Received: 1 September 2019 / Revised: 18 September 2019 / Accepted: 19 September 2019 / Published: 22 September 2019
(This article belongs to the Special Issue Turbulence and Flow–Sediment Interactions in Open-Channel Flows)
This study examines the turbulence in wall-wake flow downstream of an isolated dunal bedform. The streamwise flow velocity and Reynolds shear stress profiles at the upstream and various streamwise distances downstream of the dune were obtained. The results reveal that in the wall-wake flow, the third-order moments change their signs below the dune crest, whereas their signs remain unaltered above the crest. The near-wake flow is featured by sweep events, whereas the far-wake flow is controlled by the ejection events. Downstream of the dune, the turbulent kinetic energy production and dissipation rates, in the near-bed flow zone, are positive. However, they reduce as the vertical distance increases up to the lower-half of the dune height and beyond that, they increase with an increase in vertical distance, attaining their peaks at the crest. The turbulent kinetic energy diffusion and pressure energy diffusion rates, in the near-bed flow zone, are negative, whereas they attain their positive peaks at the crest. The anisotropy invariant maps indicate that the data plots in the wall-wake flow form a looping trend. Below the crest, the turbulence has an affinity to a two-dimensional isotropy, whereas above the crest, the anisotropy tends to reduce to a quasi-three-dimensional isotropy. View Full-Text
Keywords: hydraulics; turbulent flow; wall-wake flow; dunal bedform hydraulics; turbulent flow; wall-wake flow; dunal bedform
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MDPI and ACS Style

Sarkar, S.; Ali, S.Z.; Dey, S. Turbulence in Wall-Wake Flow Downstream of an Isolated Dunal Bedform. Water 2019, 11, 1975. https://doi.org/10.3390/w11101975

AMA Style

Sarkar S, Ali SZ, Dey S. Turbulence in Wall-Wake Flow Downstream of an Isolated Dunal Bedform. Water. 2019; 11(10):1975. https://doi.org/10.3390/w11101975

Chicago/Turabian Style

Sarkar, Sankar; Ali, Sk Z.; Dey, Subhasish. 2019. "Turbulence in Wall-Wake Flow Downstream of an Isolated Dunal Bedform" Water 11, no. 10: 1975. https://doi.org/10.3390/w11101975

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