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该文针对边界不规则、区域水文地质条件复杂的地下水数值模拟求解问题,采用基于控制体积有限差分非结构网格方法,介绍了地下水流模型建立与求解过程。结合一个模型算例,用非结构网格模拟源汇项、地下水位和流场分布,并与结构网格模拟结果进行对比分析。结果表明,非结构网格比结构网格剖分网格单元数少,实现简便,且能有效地减少计算量,对于有抽水井、河流等边界条件不规则的地下水模拟能提高计算精度。
Aiming at the problem of numerical simulation of groundwater with irregular boundaries and complicated regional hydrogeological conditions, this paper introduced the establishment and solution process of groundwater flow model by using finite difference nonstructural grid method based on control volume. Combined with a model example, the unstructured grid is used to simulate the source sink, groundwater table and flow field distribution, and the results are compared with the simulation results of the structure grid. The results show that unstructured grids have fewer mesh cells than structured grids, which is simple and can reduce the computational cost effectively. The groundwater simulation with irregular boundary conditions such as pumping wells and rivers can improve the calculation accuracy.