大區(qū)域含水層中局部復雜水流過程的多尺度模擬
[Abstract]:It is an important issue in numerical simulation of large area groundwater flow to depict the local complex flow process with small scale characteristics. In this paper, a three-dimensional coupled model of groundwater flow is established, which can be discretized numerically in multiple time and space scales. The model is used to obtain the large scale solution in the whole region and the high accuracy solution in small scale in multiple subdomains. The model adopts the Darcy's law based 3D water head interpolation algorithm to realize the multi-scale model coupling, at the same time, according to the local complex flow condition, the second order time curve fitting and the adaptive time step interpolation of the small scale model boundary water head are carried out. In order to realize the multi-time scale model coupling, in addition, the local problem can be solved by discretization of several free encryption subgrids in arbitrary boundary shape and space range, thus fully saving computation cost and guaranteeing calculation accuracy. In this paper, the solution of the general groundwater model solution software MODFLOW on high density space-time grid is used as the reference solution, and the accuracy of the model in multi-space-time scale, non-matching free grid problem is compared and analyzed. Compared with the traditional local encryption or global encryption model, this model can greatly reduce the matrix size and solve the workload, compared with the traditional local encryption multi-grid coupling model, The model in this paper can more accurately describe the local scale of complex flow processes. The model coupling scheme in this paper can be used as an efficient numerical tool for the fine characterization of small-scale complex flow processes in large regional aquifers.
【作者單位】: 武漢大學水資源與水電工程科學國家重點實驗室;
【基金】:國家自然科學基金項目(51479143) 內(nèi)蒙古自治區(qū)水利科技計劃項目([2014]117-02)
【分類號】:P641
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