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Improving the convergence behaviour of a fixed-point-iteration solver for multiphase flow in porous media

Salinas, P., Pavlidis, D., Xie, Zhihua, Adam, A., Pain, C. C. and Jackson, M. D. 2017. Improving the convergence behaviour of a fixed-point-iteration solver for multiphase flow in porous media. International Journal for Numerical Methods in Fluids 84 (8) , pp. 466-476. 10.1002/fld.4357

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Abstract

A new method to admit large Courant numbers in the numerical simulation of multiphase flow is presented. The governing equations are discretized in time using an adaptive θ-method. However, the use of implicit discretizations does not guarantee convergence of the nonlinear solver for large Courant numbers. In this work, a double-fixed point iteration method with backtracking is presented, which improves both convergence and convergence rate. Moreover, acceleration techniques are presented to yield a more robust nonlinear solver with increased effective convergence rate. The new method reduces the computational effort by strengthening the coupling between saturation and velocity, obtaining an efficient backtracking parameter, using a modified version of Anderson's acceleration and adding vanishing artificial diffusion.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Engineering
Subjects: T Technology > TJ Mechanical engineering and machinery
Publisher: John Wiley & Sons
ISSN: 0271-2091
Funders: Engineering and Physical Sciences Research Council (EPSRC)
Date of First Compliant Deposit: 27 January 2017
Date of Acceptance: 25 November 2016
Last Modified: 06 Sep 2017 15:02
URI: http://orca.cf.ac.uk/id/eprint/97687

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