Wave influence on turbulence length scales in free surface channel flows |
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| Institution: | 1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China;2. Beijing General Research Institute of Mining and Metallurgy, Beijing 100160, China;3. Beijing Key Laboratory of Automation of Mining and Metallurgy Process, Beijing 102628, China;4. Refinery of Shandong Gold Mining (Laizhou) Co. Ltd., Laizhou 261441, China;5. CSIRO Mineral Resources Flagship, Clayton VIC 3168, Australia;1. Department of Basic Medical Sciences, College of Applied Medical Science, King Khalid University, Abha 61421, Saudi Arabia;2. Institute of Mechanics and Seismic Stability of Structures of the Academy of Sciences of the Republic of Uzbekistan, Tashkent 100125, Uzbekistan;3. Barkamol MFY, Akfa University, Mirzo Ulugbek District, Tashkent 111221, Uzbekistan;4. Department of Physics, Faculty of Science Jazan University, Saudia Arabia;5. Laboratory of Physics and Chemistry of Interfaces, Department of Physics, faculty of science, Monastir University, Tunisia;6. Faculty of Medicine and Health Sciences, Ghent University, Ghent 9000, Belgium;7. Physics Department, Faculty of Applied Science, Umm AL-Qura University, P.O Box 715, Makkah, Saudi Arabia |
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| Abstract: | In order to predict sediment movements in coastal environments, the interaction between these particles and turbulence should be better understood. Although previous studies have particularly shown the importance of the turbulence length scales on sediment transport for current flows, few measurements have been made on wave/current flows. The purpose of our experiments is to get a better knowledge on wave action on these characteristic length scales. For this study, in the context of a grid-generated turbulence, we aimed to describe evolution of turbulence macro and micro scales in two kinds of free surface flow. Indeed, current and wave/current flows are studied. Two data analysis techniques are used to estimate these characteristic length scales depending on flow conditions. Whereas a well-known energetic method is used for current flow, a specific analysis based on correlation measurements is lead to describe temporal evolution of turbulence length scale over the wave period. As a main result, we show that the free surface causes a vortex stretching for current flow and that turbulence length scales follow a periodic evolution with a frequency which is twice as the swell period. The turbulence length scales also depend on wave period and amplitude. |
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