In this work, we have performed the flume study to analyze the high-order velocity moments 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 streamwise velocity variance were found increasing with seepage, which lead to increase in sediment transport with seepage. Results show that the variance of streamwise 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 show that the (2p-order moments)1/p also follows logarithmic law. The slopes Ap in the turbulent boundary layer seem fairly unaffected to NS and seepage flow but follows nonuniversal behavior for NS 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 NS flow and super-Gaussian behavior for seepage flow.
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August 2018
Research-Article
High-Order Velocity Moments of Turbulent Boundary Layers in Seepage Affected Alluvial Channel
Anurag Sharma,
Anurag Sharma
Department of Civil Engineering,
Indian Institute of Technology,
Guwahati 781039, India
e-mail: anurag.sharma@iitg.ac.in
Indian Institute of Technology,
Guwahati 781039, India
e-mail: anurag.sharma@iitg.ac.in
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Bimlesh Kumar
Bimlesh Kumar
Department of Civil Engineering,
Indian Institute of Technology,
Guwahati 781039, India
e-mail: bimk@iitg.ac.in
Indian Institute of Technology,
Guwahati 781039, India
e-mail: bimk@iitg.ac.in
Search for other works by this author on:
Anurag Sharma
Department of Civil Engineering,
Indian Institute of Technology,
Guwahati 781039, India
e-mail: anurag.sharma@iitg.ac.in
Indian Institute of Technology,
Guwahati 781039, India
e-mail: anurag.sharma@iitg.ac.in
Bimlesh Kumar
Department of Civil Engineering,
Indian Institute of Technology,
Guwahati 781039, India
e-mail: bimk@iitg.ac.in
Indian Institute of Technology,
Guwahati 781039, India
e-mail: bimk@iitg.ac.in
1Corresponding author.
Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received September 10, 2017; final manuscript received January 28, 2018; published online March 29, 2018. Assoc. Editor: Daniel Livescu.
J. Fluids Eng. Aug 2018, 140(8): 081204 (8 pages)
Published Online: March 29, 2018
Article history
Received:
September 10, 2017
Revised:
January 28, 2018
Citation
Sharma, A., and Kumar, B. (March 29, 2018). "High-Order Velocity Moments of Turbulent Boundary Layers in Seepage Affected Alluvial Channel." ASME. J. Fluids Eng. August 2018; 140(8): 081204. https://doi.org/10.1115/1.4039253
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