A vertex scheme for two-phase flow in heterogeneous media

A vertex scheme for two-phase flow in heterogeneous media
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异质介质中两相流的顶点方案

DOI:
10.1016/j.jcp.2021.110778
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发表时间:
2022
影响因子:
4.1
通讯作者:
Riviere, B.
Riviere, B.
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Joshaghani, M.S.;Girault, V.;Riviere, B.

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本文采用带质量集总和通量上绕的一阶有限元方法,给出了多孔介质中非混相两相流的数值解。未知量是物理相压和相饱和度。数值实验结果表明,该方法对人造解具有最优收敛性。对于结构化和非结构化网格,我们观察到高精度的润湿饱和度剖面,确保了最小的数值扩散在前面。通过二维和三维四分之一点问题的算例,表明该方法可以很容易地处理渗透率场的非均质性。使该方法吸引油藏模拟者的两个明显特点是:(1)满足最大原则;(2)局部质量误差很小,保持在非线性求解器容限以下。
This paper presents the numerical solution of immiscible two-phase flows in porous media, obtained by a first-order finite element method equipped with mass-lumping and flux upwinding. The unknowns are the physical phase pressure and phase saturation. Our numerical experiments confirm that the method converges optimally for manufactured solutions. For both structured and unstructured meshes, we observe the high-accuracy wetting saturation profile that ensures minimal numerical diffusion at the front. Performing several examples of quarter-five spot problems in two and three dimensions, we show that the method can easily handle heterogeneities in the permeability field. Two distinct features that make the method appealing to reservoir simulators are: (i) maximum principle is satisfied, and (ii) local mass error is small and remains below nonlinear solver tolerance.
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