Flow and solute transport through a periodic array of vertical cylinders in shallow water

Flow and solute transport through a periodic array of vertical cylinders in shallow water
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浅水中周期性排列的垂直圆柱体的流动和溶质输送

DOI:
10.1017/jfm.2014.484
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发表时间:
2014-09
影响因子:
3.7
通讯作者:
Chiang C. Mei
Chiang C. Mei
中科院分区:
工程技术2区
文献类型:
--
作者:
Xiaoyu Guo;Benlong Wang;Chiang C. Mei

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Abstract A micro-mechanical theory is proposed for the prediction of macro-scale properties of flow and dispersion in a current through a periodic array of vertical cylinders standing on a horizontal bed. A two-scale analysis reduces the numerical task to the solution of two canonical boundary value problems in a unit cell. Using measured data on the drag coefficient measured for an array in open channels, the eddy viscosity in the interstitial flow on the micro-scale is calculated for a wide range of Reynolds numbers. The macro-scale relation between the mean velocity and the surface gradient is found in the form of a nonlinear Darcy’s law. The interstitial velocity is then used to derive the macro-scale convection diffusion equation for the solute concentration, also by a two-scale analysis. The Taylor dispersivity and the total effective diffusivity are computed for a wide range of flow rates and solid fractions. Features specific to the periodic geometry are pointed out.
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