单柱直径差异性条件下柱群浅水流动的特征分析  

Study on characteristics of shallow water flow through a patch of circular cylinders with different diameter

作　　者：汪健 张景新[1,2] WANG Jian;ZHANG Jing-xin(School of Naval Architecture,Ocean and Civil Engineering,Shanghai Jiao Tong University,Shanghai 200240,China;MOE Key Laboratory of Hydrodynamics,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学船舶海洋与建筑工程学院,上海200240 [2]上海交通大学水动力学教育部重点实验室,上海200240

出　　处：《水动力学研究与进展（A辑）》2021年第3期421-428,共8页Chinese Journal of Hydrodynamics

基　　金：国家重点研发计划(2019YFB1503700)。

摘　　要：该文对不同圆柱直径下的圆柱群浅水流动进行了数值模拟研究,使用多孔介质中的间隙度和流动迂曲度对不同柱群的空间分布特征和流动特征进行了分析。对圆柱群的间隙度分析表明,圆柱直径d越大,柱群间隙度越大。柱群流动迂曲度T随着柱群密度的增加而增加。在柱群尾流区,低密度柱群的圆柱直径d越大,稳定尾流区上游速度U_(1u)越大;高密度柱群的圆柱直径d越大,稳定尾流区下游速度U_(1d)越大,但U_(1u)的大小却几乎不变。这种U_(1u)的变化趋势与迂曲度T的变化趋势类似,并且U_(1u)随T增加而单调递减。The shallow water flow through a patch of circular cylinders with different diameter is investigated numerically.The lacunarity and tortuosity analyses of porous media are used to study the spatial distribution and flow characteristics of different patches.The lacunarity analyses show that the patch lacunarity increases with the increase of cylinder diameter,d.The tortuosity T increases as the patch density increases.For the sparse patch,when d increases,the velocity U_(1u) at the upstream point of the steady wake increases.For the dense patch,the velocity U_(1d) at the downstream point of the steady wake increases with the increase of d.However,U_(1u) is almost constant.This change of U_(1u) is similar to that of the tortuosity T,and U1u decreases monotonously as T increases.

关 键 词：浅水流动 圆柱群 间隙度 迂曲度 稳定尾流区 

分 类 号：O352[理学—流体力学]