Adaptive modelling of variably saturated seepage problems

Adaptive modelling of variably saturated seepage problems
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可变饱和渗流问题的自适应建模

DOI:
10.1093/qjmam/hbab001
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发表时间:
2021
期刊:
The Quarterly Journal of Mechanics and Applied Mathematics
影响因子:
--
通讯作者:
Ashby B
Ashby B
中科院分区:
--
文献类型:
--
作者:
Ashby B

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本文针对一类具有渗流面的多孔介质地下渗流问题,提出了一种面向目标的自适应有限元方法。我们集中在一个典型的情况下,定常流动由一个非线性的Darcy-Buckingham定律控制,在次表层-大气边界上有物理约束。这导致问题被表述为一个变分不等式。用基于双加权后验误差估计的自适应有限元方法研究了这一问题的解,目的是减少特定目标量的误差。感兴趣的量被选为通过渗流面的体积水通量,因此取决于先验未知的自由边界。我们将我们的方法应用于具有挑战性的数字例子以及具体的案例研究,这是本研究的起点,说明了在实际情况中出现的主要困难。我们总结了大量的数值结果,清楚地表明所设计的方法产生了相对于自由度数的快速误差减小。
In this article, we present a goal-oriented adaptive finite element method for a class of subsurface flow problems in porous media, which exhibit seepage faces. We focus on a representative case of the steady state flows governed by a nonlinear Darcy–Buckingham law with physical constraints on subsurface-atmosphere boundaries. This leads to the formulation of the problem as a variational inequality. The solutions to this problem are investigated using an adaptive finite element method based on a dual-weighted a posteriori error estimate, derived with the aim of reducing error in a specific target quantity. The quantity of interest is chosen as volumetric water flux across the seepage face, and therefore depends on an a priori unknown free boundary. We apply our method to challenging numerical examples as well as specific case studies, from which this research originates, illustrating the major difficulties that arise in practical situations. We summarise extensive numerical results that clearly demonstrate the designed method produces rapid error reduction measured against the number of degrees of freedom.
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