Three-dimensional Numerical Simulation on Local Scour in the Downstream of Dangka Hydropower Station

WU Zhang-song; ZHANG Gen-guang; KOU Tan; WANG Xin-lei; ZHAO Jian-yong

doi:10.11988/ckyyb.20161010

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Journal of Changjiang River Scientific Research Institute ›› 2018, Vol. 35 ›› Issue (4) : 6-12. DOI: 10.11988/ckyyb.20161010

RIVER-LAKE SEDIMENTATION AND REGULATION

Three-dimensional Numerical Simulation on Local Scour in the Downstream of Dangka Hydropower Station

WU Zhang-song^1,2, ZHANG Gen-guang¹, KOU Tan³, WANG Xin-lei², ZHAO Jian-yong¹

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Abstract

The local scour process in the downstream of Dangka hydropower station is simulated based on Fluent dynamic mesh to predict the development and topography of local scour in the downstream of dam and sluice. The VOF water-air interface tracking method is used to deal with the complex free surface in the local scour. With transient shear stress on river bed as a crucial hydrodynamic condition for sediment’s incipient motion and transport, the volumetric transport rates per unit width of sediment on river bed in different directions are calculated, based on which the transient change of river bed elevation is obtained. Moreover, an improved formula of critical shear stressfor sediment’s incipient motion is employed to refrain from abnormal numerical values of sediment transport rate caused by bed slope gradient approaching sediment’s angle of repose. Finally, the 3-D evolutionary process of local scour is acquired by adopting the spring-based method and remeshing method. The accuracy and reliability of the mathematical model are verified by comparing the simulated depth and topography of local scour with model test values.

Key words

Dangka hydropower station / local scour / dynamic mesh / VOF / shear stress / sediment transport rate / depth and topography

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WU Zhang-song, ZHANG Gen-guang, KOU Tan, WANG Xin-lei, ZHAO Jian-yong. Three-dimensional Numerical Simulation on Local Scour in the Downstream of Dangka Hydropower Station[J]. Journal of Changjiang River Scientific Research Institute. 2018, 35(4): 6-12 https://doi.org/10.11988/ckyyb.20161010

References

[1] 毛昶熙,周名德,柴恭纯.闸坝工程水力学与设计管理[M].北京:水利电力出版社,1995.
[2] 严晓达,刘旭东,李贵启,等.低水头引水防沙枢纽[M].北京:水利电力出版社,1990.
[3] 高改玉.横丹水电站三维流场模拟及下游二维冲刷坑水力特性研究[D].杨凌:西北农林科技大学,2013.
[4] 史志鹏.低水头泄水建筑物消能措施数值模拟[D].杨凌:西北农林科技大学,2010.
[5] 毛荣生,吴飞. 陆水水利枢纽坝下游河床演变规律分析[J].长江科学院院报,1993,10(4):43-49.
[6] 刘沛清,冬俊瑞,余常昭. 挑射水流对岩基河床冲刷的探讨[J].长江科学院院报,1994,11(4):1-9.
[7] 王晓松,陈璧宏.挑流冲坑三维紊流场的数值模拟[J].水力发电学报,1999,(3):53-61
[8] 郭红浩,张根广.九龙峡水电站溢流堰三维数值模拟[J].长江科学院院报,2010,27(3):34-37.
[9] 杨建明,吴建华.动网格技术数值模拟挑流冲刷过程[J].水动力学研究与进展,2001, 16(2):156-161.
[10]劳尔平.水下淹没建筑物局部流场及河床冲刷坑的数值模拟[D].北京:北京交通大学,2006.
[11]邓军,许唯临,杨忠超,等.基岩冲刷的数值模拟[J].水科学进展,2005,16(1):47-51.
[12]李艳富.冲刷坑冲刷过程的数值模拟[J].科学技术与工程, 2009, 9(5): 1176-1180.
[13]凌建明,林小平,赵鸿铎.圆柱形桥墩附近三维流场及河床局部冲刷分析[J]. 同济大学学报(自然科学版),2007, 35(5): 582-586.
[14]韦雁机,叶银灿.床面上短圆柱体局部冲刷三维数值模拟[J].水动力学研究与进展(A),2008,23(6): 655-661.
[15]OLSEN N. Three-Dimensional CFD Modeling of Self-forming Meandering Channel[J]. Journal of Hydraulic Engineering,2003,129(5): 366-372.
[16]USHIJIMA S. Arbitrary Lagrangian-Eulerian Numerical Prediction for Local Scour Caused by Turbulent Flows[J]. Journal of Computational Physics, 1996,125(1): 71-82.
[17]NOBUHISA N, TAKASHI H, TATSUAKI N, et al. Three-dimensional Numerical Model for Flow and Bed Deformation around River Hydraulic Structures[J]. Journal of Hydraulic Engineering, 2005, 131(12): 1074-1087.
[18]祝志文, 刘震卿. 圆柱形桥墩周围局部冲刷的三维数值模拟[J]. 中国公路学报,2011,24(2): 42-48.
[19]熊文,汪吉豪,叶见曙.结构形式对桥墩局部冲刷三维性态发展的影响[J].东南大学学报(自然科学版),2014, 44(1): 155-161.
[20]CHEN Xiao-li, MA Ji-ming, DEY S. Sediment Transport on Arbitrary Slopes: Simplified Model[J]. Journal of Hydraulic Engineering, 2010, 136(5): 311-317.
[21]VAN RIJIN L C. Sediment Transport, Part I: Bed Load Transport[J]. Journal of Hydraulic Engineering, 1984, 110(10): 1431-1456.
[22]张红武,汪家寅.沙石及模型沙水下休止角试验研究[J].泥沙研究,1989, (3): 90-96.
[23]VAN RIJIN L C. Principles of Sediment Transport in Rivers, Estuaries and Coastal Seas[M]. Amsterdam, the Netherlands: AQUA Publications, 1993.
[24]钱宁,万兆惠.泥沙运动力学[M].北京:科学出版社,2003.
[25]MELVILLE B. Pier and Abutment Scour-integrated Approach[J]. Journal of Hydraulic Engineering, 1997, 123(2): 125-136.
[26]王新强,张根广,徐龙飞.当卡水电站消力池的优化试验研究[J].水电能源科学,2014, 32(3): 122-125.
[27]王新强.当卡水电站下游冲刷坑形态的试验研究[D].杨凌:西北农林科技大学,2014.