摘要
This paper numerically simulates the evolution of sand ripples in a turbulent open channel flow by using a methodology in which three numerical technologies were combined, i.e. the large eddy simulation, the “point-particle”immersed boundary method and the discrete particle method with coupled “event-driven”and “spring-dashpot”models. The accuracy and reliability of the numerical model were verified by comparing the numerical results of bed-load transport rate of a featureless sand bed with the results from empirical formulas at different Shields numbers. After that, the numerical model was applied in simulating the evolution process of sand ripples in a turbulent open channel flow. The time variations of the sediment transport rate, the length and height of the sand ripples, the maximum, averaged and minimum values of the effective bed location, the shape drag of the sand ripples and the bulk velocity were investigated. It was found that several sand ripples were developed from an initially flat sand bed in a short time period with tU
- 出版日期2015
- 单位天津大学