| 2,047 | 67 | 132 |
| 下载次数 | 被引频次 | 阅读次数 |
为预测圆柱形桥墩周围的局部冲刷坑形态和最大冲坑深度,基于Flow-3D软件的水动力学模块和泥沙输运模块对桥墩附近局部冲刷进行了三维数值模拟。以Melville冲刷试验为原型,采用LES大涡模拟方法,模拟了桥墩附近湍流流场。以床面瞬时切应力作为泥沙起动、输移条件,采用Van Rijn输沙率公式计算床面冲淤。采用FAVOR技术追踪河床形态变化,得到了桥墩附近局部冲刷形态。经实测资料验证,计算结果与模型实测的冲坑形态及最大冲坑深度基本吻合。
Abstract：A three-dimensional numerical simulation on the local scour of the pier based on the flow module and the sediment transport module from the Flow-3D was studied in this paper. The Melville' s scouring test was used as a prototype data to establish the numerical model. LES simulation was used to more accurately reflecting the impact of turbulent pulsations at the front of piers on the erosion and deposition of the river bed.The instantaneous shear stresses of the bed surface were used as the sediment initial and transport condition.Sediment transport rate was calculated by sedimentary transport function proposed by Van Rijn. FAVOR method was used to represent the complex geometry fluvial processes. Finally the morphological map of the local erosion of the pier was obtained. Results show that the calculated results are in good agreement with the measured scour pit shape and the maximum scour depth.
[1]Breusers H N C,Nicollet G,Shen H W.Local scour around cylindrical piers[J].Journal of Hydraulic Research,1977,15(3):211-252．
[2]Melville B W,Raudkivi A J.Flow characteristics in local scour at bridge piers[J].Journal of Hydraulic Research,1977,15(4):373-380．
[3]Dey S.Local scour at cylindrical piers,part I:A review of developments of research[J].International Journal of Sediment Research,1997,12(2):23-44．
[4]Dey S.Local scour at cylindrical piers,partⅡ:bibliography[J].International Journal of Sediment Research,1997,12(2):45-57．
[5]Abdul K B,DEY S.Vortex flow field in a scour hole around abutments[J].International Journal of Sediment Research,2003,18(4):310-325．
[6]Michael I.Loose boundary hydraulics[J].Canadian Journal of Civil Engineering,1991,18(5):892-892．
[7]Whitehouse R.Scour at marine structures[M].Thomas Telford.1998．
[8]Melville B W et al.Bridge scour[M].Water Resources Publications,LLC,USA.2000．
[9]Melville B.The physics of local scour at bridge piers[C].Fourth International Conference on Scour and Erosion.5-7th,November,Tokyo Japan,2008,28-38．
[10]Olsen N R B,Melaaen M C.Three-dimensional calculation of scour around cylinders[J].Journal of Hydraulic Engineering,1993,119(9):1048-1054．
[11]Nils R B O,Hilde M K.Three-dimensional numerical flow modeling for estimation of maximum local scour depth[J].Journal of Hydraulic Research,1998,36(4):579-590．
[12]Roulund A,Sumer M B,Fredse J,et al.Numerical and experimental investigation of flow and scour around a circular pile[J].Journal of Fluid Mechanics,2005,534:351-401．
[13]Zhao M,Cheng L,Zang Z.Experimental and numerical investigation of local scour around a submerged vertical circular cylinder in steady currents[J].Coastal Engineering,2010,57(8):709-721．
[14]Escauriaza C,Sotiropoulos F.Initial stages of erosion and bed form development in a turbulent flow around a cylindrical pier[J].Journal of Geophysical Research,2011,116(F3)．
[15]Kim S H,et al.Numerical investigation of local scour at two adjacent cylinders[J].Advances in Water Resources,2014,70:131-147．
[16]Soulsby R L.Bedload transport.Chapter 9,Dynamics of Marine Sand[M].Thomas Telford Publications,London,1997．
[17]Dick R M,Jan H V D B.Breaching in fine sands and the generation of sustained turbidity currents in submarine canyons[J].Sedimentology,2003,50(4):625-637．
[18]Zhang Q,et al.Numerical investigation of local scour around three adjacent piles with different arrangements under current[J].Ocean Engineering,2017,142:625-638．
[19]Leo C,et al.Sediment transport,part 1:bed load transport[J].Journal of Hydraulic Engineering,1984,110(10):1431-1456．
[20]陈小莉．局部绕流冲刷机理及数值模拟研究[D]．北京:清华大学，2008．
[21]Hirt C W,Sicilian J M.A porosity technique for the definition of obstacles in rectangular cell meshes[C]//Proceedings of 4th international conference on ship hydrodynamics,Washington D C,1985:548-567．
[22]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．
[23]王飞，张彬，齐剑峰．桥墩局部冲刷发展过程的三维动网格模拟[J]．南水北调与水利科技，2017,15(2):132-137.
基本信息:
DOI：10.16239/j.cnki.0468-155x.2020.01.010
中图分类号:U442.32;TV147.5
引用信息:
[1]张曙光,尹进步,张根广.基于Flow-3D的圆柱形桥墩局部冲刷大涡模拟[J].泥沙研究,2020,45(01):67-73.DOI:10.16239/j.cnki.0468-155x.2020.01.010.
基金信息:
国家自然科学基金项目(51279170)