Benchmark for numerical solutions of flow in heterogeneous groundwater formations
Benchmark for numerical solutions of flow in heterogeneous groundwater formations
复制标题
非均质地下水层流动数值解基准
DOI:
10.1016/j.advwatres.2020.103558
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发表时间:
2020
期刊:
影响因子:
--
通讯作者:
Prechtel
中科院分区:
文献类型:
--
作者:
Alecsa;Nechita;Knabner;Prechtel
This article presents numerical investigations on accuracy and convergence properties of several numerical approaches for simulating steady state flows in heterogeneous aquifers. Finite difference, finite element, discontinuous Galerkin, spectral, and random walk methods are tested on two-dimensional benchmark flow problems. Realizations of log-normal hydraulic conductivity fields are generated by Kraichnan algorithms in closed form as finite sums of random periodic modes, which allow direct code verification by comparisons with manufactured reference solutions. The quality of the methods is assessed for increasing number of random modes and for increasing variance of the log-hydraulic conductivity fields with Gaussian and exponential correlation. Experimental orders of convergence are calculated from successive refinements of the grid. The numerical methods are further validated by comparisons between statistical inferences obtained from Monte Carlo ensembles of numerical solutions and theoretical first-order perturbation results. It is found that while for Gaussian correlation of the log-conductivity field all the methods perform well, in the exponential case their accuracy deteriorates and, for large variance and number of modes, the benchmark problems are practically not solvable with reasonably large computing resources, for all the methods considered in this study.
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DOI:
10.1515/auom-2015-0054
发表时间:
2015
期刊:
Analele Universitatii "Ovidius" Constanta - Seria Matematica
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作者:
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2010
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2010
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通讯作者:
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1991
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2009
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