التفاصيل البيبلوغرافية
| العنوان: |
Numerical Simulation of Effects of Permeable Spur Dike on Three-dimensional flow Structure in Curved Channel with Different Curvatures. (English) |
| المؤلفون: |
XIE Peng, LI Chun-guang, LÜ Sui-ju, JING He-fang, ZHANG Feng-zhu |
| المصدر: |
China Rural Water & Hydropower; 2024, Issue 5, p31-40, 10p |
| مصطلحات موضوعية: |
THREE-dimensional flow, CURVATURE, COMPUTER simulation, REGULATION of rivers, RIVER channels, MOUNTAIN wave |
| مستخلص: |
Compared with traditional spur dike, permeable spur dike have more excellent stability, safety and reliability, so they have been valued in the promotion of green channels. The purpose of this study is to compare the changes of three-dimensional flow structure in different curvature channels, and then provide basis for river regulation with different curvature. The research uses a combination of numerical simulation and actual measurement to compare, select and verify three turbulence models: Standard k-ε, RNG k-ε, and Realizable k-ε. The correlation coefficients between simulated velocity and measured velocity in the inner bank of Standard k-ε, RNG k-ε, and Realizable k-ε turbulence models are lower than those in the outer bank. The correlation coefficients between measured velocity and simulated velocity in RNG k-ε turbulence model are the highest. Finally, RNG k-ε turbulence model is used to simulate the 90° and 180° bend, and to analyze the three-dimensional streamline, velocity, bed shear and water surface line. The results show that the vortex axis in the downstream region of the spur dikes inclines to different degrees under the influence of vertical and radial velocity gradients. Two vortices in opposite directions are generated between the spur dikes when the current strikes No.2 spur dikes, which will threaten the structural stability of the permeable spur dikes, but at the same time prevent a large amount of sediment from depositing between the permeable spur dikes and ensure that the permeable spur dikes will not lose their permeability during use. The increase of river curvature leads to the migration of strong shear layer to the inner bank, and two strong shear layers appear in the 180° bend, which will lead to the evolution of river bed to step type. For the mountain river with large curvature and narrowness, the erosion effect of inner bank should be evaluated after arranging permeable spur dike to prevent the migration of strong shear layer from posing threat to inner bank. The water surface line is low inside and high outside, and in the range of x/L=0.48-0.5, the difference between the water surface line inside and outside is the smallest, and the water surface appears concave. [ABSTRACT FROM AUTHOR] |
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