基于MRT-LBE模型的植被水流数值模拟研究
发布时间：2019-05-13 12:59
【摘要】：河道中水生植物的存在会影响水流结构,从而对河床冲淤、航运、防汛工程等产生影响。基于格子Boltzmann方法,对具有刚性植被的实验室水槽水流进行了二维数值模拟研究。为了验证数值模拟结果,采用三维激光多普勒流速仪对含不同直径、不同排列方式植被群的实验室水槽水流进行了实测。由于单松弛模型在高雷诺数下不太稳定,因此引入了多松弛模型(MRT模型),并在模型中加入了植被拖曳力,给出了MRT-LBE模型的具体算法。对稀疏交错、稠密交错、稀疏并排、稠密并排4种典型工况下非淹没刚性植被的水流结构进行了数值模拟。结果表明模拟结果与实测数据吻合较好,说明MRT-LBE模型能够合理地模拟具有刚性植被的明渠水流。同时,根据数值模拟结果,分析并讨论了4种典型工况下的水流特性。
[Abstract]:The existence of aquatic plants in the river will affect the flow structure, which will have an impact on river bed scouring and silting, shipping, flood control engineering and so on. Based on lattice Boltzmann method, two-dimensional numerical simulation of laboratory flume flow with rigid vegetation is carried out. In order to verify the numerical simulation results, the flow in laboratory flume with different diameters and arrangement was measured by three-dimensional laser Doppler velocimeter. Because the single relaxation model is not stable at high Reynolds number, the multi-relaxation model (MRT model) is introduced, and the vegetation drag force is added to the model, and the concrete algorithm of MRT-LBE model is given. The flow structure of non-submerged rigid vegetation under four typical working conditions: sparse crisscross, dense interlaced, sparse side-by-side and dense side-by-side is simulated. The results show that the simulation results are in good agreement with the measured data, which indicates that the MRT-LBE model can reasonably simulate the open channel flow with rigid vegetation. At the same time, according to the numerical simulation results, the flow characteristics under four typical working conditions are analyzed and discussed.
【作者单位】： 北方民族大学数学与信息科学学院;北方民族大学数值计算与工程应用研究所;天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金资助项目(11361002) 天津大学水利工程仿真与安全国家重点实验室开放基金资助项目(HESS-1718) 北方民族大学研究生创新项目(YCX1682);北方民族大学科研项目(2014QZP05/2014XB211)
【分类号】：Q948.8;TV131.3
[Abstract]:The existence of aquatic plants in the river will affect the flow structure, which will have an impact on river bed scouring and silting, shipping, flood control engineering and so on. Based on lattice Boltzmann method, two-dimensional numerical simulation of laboratory flume flow with rigid vegetation is carried out. In order to verify the numerical simulation results, the flow in laboratory flume with different diameters and arrangement was measured by three-dimensional laser Doppler velocimeter. Because the single relaxation model is not stable at high Reynolds number, the multi-relaxation model (MRT model) is introduced, and the vegetation drag force is added to the model, and the concrete algorithm of MRT-LBE model is given. The flow structure of non-submerged rigid vegetation under four typical working conditions: sparse crisscross, dense interlaced, sparse side-by-side and dense side-by-side is simulated. The results show that the simulation results are in good agreement with the measured data, which indicates that the MRT-LBE model can reasonably simulate the open channel flow with rigid vegetation. At the same time, according to the numerical simulation results, the flow characteristics under four typical working conditions are analyzed and discussed.
【作者单位】： 北方民族大学数学与信息科学学院;北方民族大学数值计算与工程应用研究所;天津大学水利工程仿真与安全国家重点实验室;
【基金】：国家自然科学基金资助项目(11361002) 天津大学水利工程仿真与安全国家重点实验室开放基金资助项目(HESS-1718) 北方民族大学研究生创新项目(YCX1682);北方民族大学科研项目(2014QZP05/2014XB211)
【分类号】：Q948.8;TV131.3
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