基于非静压三维数值模型的丁坝水毁研究  

Simulation of spurdike water destruction with 3D non-hydrostatic numerical model

作　　者：张明进[1,2] 白玉川[1] 张华庆[2] 金生[3] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072 [2]交通运输部天津水运工程科学研究所,天津300456 [3]大连理工大学,辽宁大连116024

出　　处：《水力发电学报》2014年第3期179-188,共10页Journal of Hydroelectric Engineering

基　　金：国家863计划(2012AA112508);西部交通建设科技项目(201132822430;20113282241760);国家自然科学基金(51209112);中央级公益性科研院所基本科研业务费(TKS120102)

摘　　要：为了分析丁坝水毁的原因,需要清楚丁坝局部水流特性和坝体压力分布情况,非静压水流模型不仅可以更精确地模拟丁坝局部水流流态,而且可以准确模拟坝体压力的空间分布。本文建立了基于非结构化网格求解三维自由表面流动的非静压数值模型,模型通过对Tominaga水槽试验的模拟,验证了模型的准确性和有效性。利用本文所建立的模型,模拟了两种常见的丁坝结构型式在两种工况下的水流及压力分布情况,分析了流速和压强变化对丁坝水毁的影响。分析表明,丁坝的坝头和坝根处的流速较大,而且坝头和坝根位置的坝前后压差也较大,从而导致丁坝的坝头和坝根处容易水毁。Understanding local water flow characteristics and pressure distribution is a key for addressing water destruction of spur dikes, and these two flow features of a spur dike can be accurately simulated with a non-hydrostatic model. This paper describes a non-hydrostatic model on an unstructured mesh for calculation of 3D free surface flow. This model has been verified by the Tominaga flume experiment, then applied to simulation of the distributions of flow velocity and pressure around two types of sPur dike structures in two different flow conditions. The influences of velocity and pressure variation on water damage to the spur dikes were analyzed. The results show that flow velocities near the dike head and root are greater and the pressure difference between the dike＇s front and rear facesof thesetwo locations are also greater than other locations. Thus, dike head and root are two locations easier to be damaged by water flow.

关 键 词：工程水力学 丁坝水毁 非静压水流模型 水流流态 压强分布 

分 类 号：TV135[水利工程—水力学及河流动力学]