Numerical simulation of sandy bed erosion by 2D vertical jet  

作　　者：HUAI WenXin WANG ZengWu QIAN ZhongDong HAN YaQiong 

机构地区：[1]State Key Laboratory of Water Resources and Hvdropower Engineering Science, Wuhan University, Wuhan 430072, China

出　　处：《Science China(Technological Sciences)》2011年第12期3265-3274,共10页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China (Grant Nos.10972163,51079106));the Fundamental Research Funds for the Central Universities (Grant Nos.2104001,2103002)

摘　　要：A two-dimensional numerical model of vertical jet scour was developed based on the turbulent flow theory and jet scour mechanism. In this model, drag force acts as the main reference variable and the critical Shields number acts as the incipient motion criteria of sediment. The morphological change in the bed caused by bed-load transport is simulated using the moving mesh method and the suspended-load is not considered. An experiment investigating vertical clear water jet scour was conducted in the laboratory, and some effective experimental results, such as flow pattems and distribution characteristics of scour pits, were obtained. Numerical simulation of the 2D jet scour was conducted using the same parameters as were used in the flume experiment. The evolution process of the jet scour observed in the experiment was simulated by the new model; validation of the numerical model and the algorithm was conducted. Semi-empirical formulas of the characteristic length of the equi-librium scour hole were deduced based on the results of the experiment and simulation.

关 键 词：jet scour numerical simulation moving mesh Shields number 

分 类 号：O657.63[理学—分析化学] TP69[理学—化学]