3-D Numerical Simulation of Flow Structures in a Sharp Bend of the Lower Yangtze River

Abstract:

The three-dimensional (3-D) flow structures in the Taiziji Waterway of the Lower Yangtze River were simulated by a 3-D numerical model, where the river plan form is a sharp bend and island-braided. The verification results of the 3-D model indicated that the simulated results agree with the measured data. The patterns of 3-D flow structures in this sharp bend with different discharge were analyzed based on the calculated results.The simulated results demostrated that strong 3-D features of flow structures can be found in the sharp bend of Taiziji Waterway, the bottom velocity vectors point to the convex bank while the surface vectors point to the concave bank. The velocity distribution alone the lateral direction in the sharp bend depends mostly on the flow discharge. The discharge ratio of the left branch increases as flow discharge increases.

• Periodical: Applied Mechanics and Materials (Volumes 580-583)
• Pages: 3007-3012
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.580-583.3007
• Online since: July 2014
• Authors: Dong Dong Jia*, Yin Jun Lu, Xing Nong Zhang, Xi Bao Zhang
• Keywords: 3D Numerical Simulation, Channel Bends, Flow Structures

References

[1] Liu Yue-qin, Zheng Shao-Wen, Wu Qiang. Experimental study of 3-D turbulent bend flows in open channel, Journal of Hydrodynamics, Ser. B, 17(6): 704-712(2005).

[2] J de vriend. Flow measurments in cured rectangular channel, Internal report 9-79. University of Delft, The Netherlands. (1979).

[3] Chang Y C. Lateral mixing in meandering channels, Ph. D. thesis, University of Iowa, USA. (1971 ).

[4] HC Lien, TY Hsieh, JC Yang, et al. Bend-flow Simulation Using 2D Depth-Averaged Model. J. Hydr. Engrg., ASCE, 123(10): 1097-1108. (1999).

DOI: 10.1061/(asce)0733-9429(1999)125:10(1097)

[5] Fang chunming. Simutation of bend secondary flow effect in a planar 2D depth-averaged model. Journal fo China Institute of Water Resourses and Hydropower Research, 1(3): 190-193. (2003).

[6] Wu W., Rodi W., Wenka T. 3D numerical modeling of flow sediment and transport in open channels. Journal of Hydraulic Engineering ASCE. 126(1): 4-15(2000).

DOI: 10.1061/(asce)0733-9429(2000)126:1(4)

[7] Jia DD, Shao XJ, Wang H, et al. Three-dimensional modeling of bank erosion and morphological changes in the Shishou bend of the middle Yangtze River, Advances in Water Resources, 33(3): 348-360(2010).

DOI: 10.1016/j.advwatres.2010.01.002

[8] Jia Dong-dong, Shao Xue-jun, Zhang Xing-nong, et al. Sedimentation Patterns of Fine-Grained Particles in the Dam Area of the Three Gorges Project 3D Numerical Simulation. Journal of Hydraulic Engineering ASCE. 139(6): 669-674(2013).

DOI: 10.1061/(asce)hy.1943-7900.0000709