Volume 22, Issue 2 (Summer 2018)                   jwss 2018, 22(2): 29-40 | Back to browse issues page

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Motamedi A, Galoie M. Experimental Measurement and Numerical Model of Dunes Drag Coefficients. jwss 2018; 22 (2) :29-40
URL: http://jstnar.iut.ac.ir/article-1-3358-en.html
1. Civil Engineering, Architecture and Urban Planning Department, Technical University of Buein Zahra, Qazvin, Iran. , artemis.mot@mail.com
Abstract:   (6310 Views)
In order to investigate the flow formation on dunes, the experimental data from a flume 12 meters long, located in Hydraulic Lab at Technical University of Graz (Austria), were collected. In this study, dunes (particle sizes of 13 and 6 mm) in a 2-D plan were developed with the wavelength of 1 meter, the lee angle of 8 degree, and the crest heights of 4 and 6 cm; these were uniformly installed across the width of flume. The analysis of the experimental flow velocity profiles measured by ADV and PIV technology and the numerical profiles modeled by SSIMM showed that in the same hydraulic conditions, there was no significant relation between drag coefficients of particles on dunes and flow discharge variation, while the water depth reduction caused a sudden increase in the drag coefficient up to 66%. Also, reducing particle size of the dune increased the drag coefficient and there was a significant relation between particle size (diameter) and dune formation, so that in smooth crested conditions, as compared with the sharp crested dune, the drag coefficient was increased up to 32%.
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Type of Study: Research | Subject: Ggeneral
Received: 2016/10/5 | Accepted: 2017/05/27 | Published: 2018/09/15

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