EXPERIMENTAL AND NUMERICAL INVESTIGATIONS ON SECONDARY FLOWS AND SEDIMENTATIONS BEHIND A SPUR DIKE |
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| Authors: | TANG Xue-lin DING Xiang CHEN Zhi-cong |
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| Affiliation: | 1. School of Hydraulic Engineering, Changsha University of Science and Technology, Changsha, Hunan 410114, China;2. Department of Oceanography, University of Hawaii at Manoa, Honolulu, HI 96822, USA;3. Department of Geology and Geophysics, University of Hawaii at Manoa, Honolulu, HI 96822, USA;4. School of Environment, University of Auckland, Auckland 1142, New Zealand;1. Aquaculture Postgraduate Program, Federal University of Santa Catarina, Agricultural Science Center, Florianópolis, Santa Catarina 88034-001, Brazil;2. Company of Agricultural Research and Rural Extension of Santa Catarina, Information Center of Environmental Resources and Hydrometeorology of Santa Catarina, Florianópolis, Santa Catarina 88034-901, Brazil;3. Federal University of Santa Catarina, Agricultural Science Center, Aquaculture Department, Florianópolis, Santa Catarina 88034-001, Brazil |
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| Abstract: | For a physical model of the approach navigation channel of Three Gorges Project(TGP), flow patterns around a non-submerged spur dike placed as a mountain in a long rectangular glass flume were experimentally investigated with and without "sucking-spouting" water respectively. Based on rigid lid assumption and Dynamic Smagorinsky Model, all these vortex flows around the spur dike were numerically simulated and analyzed, which probably affect the whole flow field and then probably lead to sedimentations for silt-laden two-phase flows. Meanwhile, silt-laden flows were also investigated experimentally. Both the secondary flow region and the silt sedimentations downstream of the spur dike decrease greatly with "sucking-spouting" water compared to those ones without "sucking-spouting" water. The Finite Volume Method (FVM) was used to discretize the governing equations together with a staggered grid system, where the second order difference is employed for the diffusion terms and the source terms while the upwind difference QUICK is used for the convection terms. The computational results are all in fairly good agreement with the experimental data. |
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| Keywords: | Three Gorges Project (TGP) "sucking-spouting" water spur dike silt-laden flow rigid lid assumption dynamic large eddy simulations |
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