用浸没边界-格子Boltzmann方法模拟双层刚性植被明渠水流特性  

Simulation of the open channel flow over double-layered rigid submerged vegetation by the immersed boundary-lattice Boltzmann method

作　　者：周睿 程永光[1] 吴家阳[1] 黄泽浩 ZHOU Rui;CHENG Yong-guang;WU Jia-yang;HUANG Ze-hao(State Key Laboratory of Water Resources and Hydropower Engineering Sciences,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室

出　　处：《水动力学研究与进展（A辑）》2019年第4期503-511,共9页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(11172219);高等学校博士学科点专项科研基金(20130141110013)~~

摘　　要：含植被明渠水流的模拟是水动力学中的一个典型问题。该文尝试用浸没边界-格子Boltzmann方法(immersed boundary-lattice Boltzmann method,IB-LBM),结合大涡模拟,对含双层刚性植被明渠水流进行数值模拟分析。首先介绍了IB-LBM的基本思想和局部加密网格处理刚性杆件的方法;然后模拟典型双层刚性植被明渠流,将模拟结果和实验数据及有限体积法模拟数据对比,验证了其精度和可靠性;最后,通过加大植被密度和改变密度比来深入分析植被密度影响规律。结果显示,通过局部网格加密和并行计算,IB-LBM可模拟较大规模的含植被流动;改变植被密度和两层之间的密度比对宏观流速剖面线的转折点和凹弧曲率有影响。The open channel flow through double-layered rigid submerged vegetation was simulated by the immersed boundary-lattice Boltzmann method(IB-LBM), combing the large eddy simulation turbulence model. In this paper, the basic idea of treating the rigid pole boundary by IB-LBM is introduced together with the grid refinement scheme. Then, the feasibility of the simulation is validated by comparing the results with experimental data and those from the traditional numerical models,which shows good agreement in averaged velocity profiles. Further, the analysis of the effects of vegetation density and density ratio between the two layers on flow characteristics is provided. It is shown that incorporating grid refinement and parallel computation into IB-LBM makes the large scale simulation of submerged vegetation flow possible, and the specific transitional points in velocity profile and the curvatures of the concave arcs have regular relations with vegetation density and density ratio.

关 键 词：浸没边界-格子Boltzmann方法 大涡模拟 明渠流 植被 局部网格加密 

分 类 号：TV131[水利工程—水力学及河流动力学]