Meshless Multi-Point Flux Approximation

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Abstract

The reservoir simulation of the complex reservoirs with anisotropic permeability,which includes faults and non-orthogonal grids, with a fully discontinuous permeability tensor in the discretization is a major challenge. Several methods have already been developed and implemented within industry standard reservoir simulators for non-orthogonal grids (e.g., Multi-Point Flux Approximation (MPFA) “O” method). However, it has been noticed that some of the numerical methods for elliptic/parabolic equations may violate the maximum principle (i.e., lead to spurious oscillations), especially when the anisotropy is particularly strong. It has been found that the oscillations are closely related to the poor approximation of the pressure gradient in the flux computation. Therefore, proposed methods must correctly approximate underlying operators, satisfy a discrete maximum principle and have coercivity properties. Furthermore, the method must be robust and efficient. This paper presents the meshless multi-point flux approximation of second order elliptic operators containing a tensor coefficient. The method is based on a pressure gradient approximation commonly used in meshless methods (or Smoothed Particle Hydrodynamics method—SPH method). The proposed discretization schemes can be written as a sum of sparse positive semidefinite matrix and perturbation matrix. We show that convergence rates are retained as for finite difference methods O(hα), 1 ≤ α < 2, where h denotes the maximum particle spacing. The results are presented, discussed and future studies are outlined.

Original languageEnglish
Title of host publicationMeshfree Methods for Partial Differential Equations VIII
EditorsMichael Griebel, Marc Alexander Schweitzer
Place of PublicationCham
PublisherSpringer
Pages67-84
Number of pages18
ISBN (Electronic)978-3-319-51954-8
ISBN (Print)978-3-319-51953-1
DOIs
Publication statusPublished - 2017
Event8th International Workshop on Meshfree Methods for Partial Differential Equations, 2015 - Bonn, Germany
Duration: 7 Sep 20159 Sep 2015

Publication series

NameLecture Notes in Computational Science and Engineering
Volume115
ISSN (Print)1439-7358
ISSN (Electronic)2197-7100

Conference

Conference8th International Workshop on Meshfree Methods for Partial Differential Equations, 2015
CountryGermany
City Bonn
Period7/09/159/09/15

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