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research-article

High-Order Velocity Moments of Turbulent boundary layers in Seepage Affected Alluvial Channel

[+] Author and Article Information
Anurag Sharma

Research Scholar, Department of Civil Engineering, Indian Institute of Technology, Guwahati, India-781039
anurag.sharma@iitg.ac.in

Bimlesh Kumar

Associate Professor, Department of Civil Engineering, Indian Institute of Technology, Guwahati, India-781039, 0091-361-2582420
bimk@iitg.ac.in

1Corresponding author.

ASME doi:10.1115/1.4039253 History: Received September 10, 2017; Revised January 28, 2018

Abstract

In this work, we have performed the flume study to analyze the structure function of turbulent boundary layer with and without downward seepage. Sediment transport experiments were done in the laboratory for no seepage (NS), 10% seepage (10%S) and 15% seepage (15%S) cases. Measures of stream wise velocity variance were found increasing with seepage, which lead to increase in sediment transport with seepage. Results show that the variance of stream wise velocity fluctuation follows logarithmic law with distance away from the bed, within inner layer. This observation is also valid for even-order moments obtained in this work. The results shows that the (2p-order moments)1/p also follow logarithmic law. The slopes Ap in the turbulent boundary layer seem fairly unaffected to no seepage and seepage flow, but follows non- universal behavior for no seepage and seepage runs. The computed slope based on the Gaussian statistics does not agree well with the slope obtained from the experimental data and computed slope are reliable with sub-Gaussian performance for no seepage flow and super-Gaussian behavior for seepage flow.

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