Distribution of primary and secondary currents in sine-generated bends
Distribution of primary and secondary currents in sine-generated bends
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正弦产生的弯曲中初级和次级电流的分布
DOI：
10.4314/wsa.v44i1.14
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发表时间：
2018-02
期刊：
影响因子：
1.5
通讯作者：
Li He
中科院分区：
文献类型：
--
作者：
Li He
弯曲河道中的次级环流使流速在弯曲处重新分布。然而，主流的二次流的移位没有定量地理解，由于难以隔离的曲率驱动的二次流的地形驱动的二次流在床变形的曲流的作用。利用CCHE2D研究了曲率驱动和地形驱动的二次流对正弦弯曲河道中一次流再分布的影响。该模型使用两套实验室实验，包括平板流和流动床流的测量数据进行校准。分析表明，地形诱导流主要是对弯道内一次流由内向外的再分配起作用，而对弯道曲率驱动的二次流作用不大。关键词：主流，二次流，曲流，数值分析
The secondary circulation in a meandering channel redistributes the velocity over the bend. However, the shift of primary flow by secondary currents is not quantitatively understood, due to the difficulty in isolating the role of curvature-driven secondary flow from that of topography-driven secondary flow in bed-deformed meanders. The influences of curvaturedriven and topography-driven secondary currents on the redistribution of primary flow in sine-generated meandering channels were examined by CCHE2D. The model is calibrated using data measured in two sets of laboratory experiments including flat-bed flow and mobile-bed flow. Analysis indicated that topography-induced current mainly contributes to the redistribution of primary flow from inner to outer bank in the curved channels, rather than the secondary flow driven by curvature. Keywords: primary flow, secondary flow, meander, numerical analysis