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Groundwater flow simulation in a confined aquifer using Local Radial Point Interpolation Meshless method (LRPIM)
Engineering Analysis With Boundary Elements ( IF 4.2 ) Pub Date : 2021-11-19 , DOI: 10.1016/j.enganabound.2021.11.004
K. Swetha 1 , T.I. Eldho 2 , L. Guneshwor Singh 3 , A. Vinod Kumar 1, 4
Affiliation  

Groundwater flow problems are generally solved using analytical or numerical methods. Though analytical solutions are exact and preferable, they are not available for complex field problems. Hence numerical methods such as Finite Element and Finite Difference methods are used to solve complex groundwater problems. These conventional mesh/ grid-based numerical methods need construction of a detailed mesh/ grid. On the other hand, the meshless approach creates a system of algebraic equations on a collection of distributed nodes in the problem area and the boundary. As a result, it is easy to incorporate any modifications to the model at a later time by simply adding nodes to the domain. In this study a weak form meshless method known as local radial point interpolation method (LRPIM) which uses radial basis functions for approximation or interpolation is developed to solve the groundwater flow problems in a confined aquifer. The results obtained from the LRPIM model has been compared with other numerical methods for benchmark and real field problems, and are found to be satisfactory. Implementation of the essential boundary conditions was relatively easier in LRPIM and gave good accuracy for the problems considered. LRPIM can potentially be used as an alternative to the other conventional methods, especially where the domain boundary is irregular or varying with time.



中文翻译:

使用局部径向点插值无网格方法 (LRPIM) 模拟承压含水层中的地下水流

地下水流动问题通常使用解析或数值方法解决。尽管解析解是精确且可取的,但它们不适用于复杂的现场问题。因此,数值方法如有限元和有限差分方法被用于解决复杂的地下水问题。这些传统的基于网格/网格的数值方法需要构建详细的网格/网格。另一方面,无网格方法在问题区域和边界的分布式节点集合上创建代数方程组。因此,以后只需将节点添加到域中,就可以轻松地将任何修改合并到模型中。在这项研究中,开发了一种称为局部径向点插值法 (LRPIM) 的弱形式无网格方法,该方法使用径向基函数进行近似或插值,以解决承压含水层中的地下水流动问题。从 LRPIM 模型获得的结果已与其他数值方法进行了比较,用于基准和实际领域问题,结果令人满意。在 LRPIM 中基本边界条件的实现相对容易,并且对所考虑的问题给出了很好的精度。LRPIM 可以潜在地用作其他传统方法的替代方法,尤其是在域边界不规则或随时间变化的情况下。从 LRPIM 模型获得的结果已与其他数值方法进行了比较,用于基准和实际领域问题,结果令人满意。在 LRPIM 中基本边界条件的实现相对容易,并且对所考虑的问题给出了很好的精度。LRPIM 可以潜在地用作其他传统方法的替代方法,尤其是在域边界不规则或随时间变化的情况下。从 LRPIM 模型获得的结果已与其他数值方法进行了比较,用于基准和实际领域问题,结果令人满意。在 LRPIM 中基本边界条件的实现相对容易,并且对所考虑的问题给出了很好的精度。LRPIM 可以潜在地用作其他传统方法的替代方法,尤其是在域边界不规则或随时间变化的情况下。

更新日期:2021-11-19
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