【摘要】：河道中水生植物的存在會影響水流結(jié)構(gòu),從而對河床沖淤、航運、防汛工程等產(chǎn)生影響�；诟褡覤oltzmann方法,對具有剛性植被的實驗室水槽水流進(jìn)行了二維數(shù)值模擬研究。為了驗證數(shù)值模擬結(jié)果,采用三維激光多普勒流速儀對含不同直徑、不同排列方式植被群的實驗室水槽水流進(jìn)行了實測。由于單松弛模型在高雷諾數(shù)下不太穩(wěn)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,給出了MRT-LBE模型的具體算法。對稀疏交錯、稠密交錯、稀疏并排、稠密并排4種典型工況下非淹沒剛性植被的水流結(jié)構(gòu)進(jìn)行了數(shù)值模擬。結(jié)果表明模擬結(jié)果與實測數(shù)據(jù)吻合較好,說明MRT-LBE模型能夠合理地模擬具有剛性植被的明渠水流。同時,根據(jù)數(shù)值模擬結(jié)果,分析并討論了4種典型工況下的水流特性。
[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.
【作者單位】： 北方民族大學(xué)數(shù)學(xué)與信息科學(xué)學(xué)院;北方民族大學(xué)數(shù)值計算與工程應(yīng)用研究所;天津大學(xué)水利工程仿真與安全國家重點實驗室;
【基金】：國家自然科學(xué)基金資助項目(11361002) 天津大學(xué)水利工程仿真與安全國家重點實驗室開放基金資助項目(HESS-1718) 北方民族大學(xué)研究生創(chuàng)新項目(YCX1682);北方民族大學(xué)科研項目(2014QZP05/2014XB211)
【分類號】：Q948.8;TV131.3

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