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Newton-Multigrid for Biological Reaction-Diffusion Problems with Random Coefficients

Published online by Cambridge University Press:  28 May 2015

Eveline Rosseel*
Affiliation:
Computer Science Department, Katholieke Universiteit Leuven, Celestijnenlaan 200A, B-3001 Leuven, Belgium
Nico Scheerlinck*
Affiliation:
Computer Science Department, Katholieke Universiteit Leuven, Celestijnenlaan 200A, B-3001 Leuven, Belgium
Stefan Vandewalle*
Affiliation:
Computer Science Department, Katholieke Universiteit Leuven, Celestijnenlaan 200A, B-3001 Leuven, Belgium
*
Corresponding author.Email address:eveline.rosseel@cs.kuleuven.be
Corresponding author.Email address:nico.scheerlinck@cs.kuleuven.be
Corresponding author.Email address:stefan.vandewalle@cs.kuleuven.be
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Abstract

An algebraic Newton-multigrid method is proposed in order to efficiently solve systems of nonlinear reaction-diffusion problems with stochastic coefficients. These problems model the conversion of starch into sugars in growing apples. The stochastic system is first converted into a large coupled system of deterministic equations by applying a stochastic Galerkin finite element discretization. This method leads to high-order accurate stochastic solutions. A stable and high-order time discretization is obtained by applying a fully implicit Runge-Kutta method. After Newton linearization, a point-based algebraic multigrid solution method is applied. In order to decrease the computational cost, alternative multigrid preconditioners are presented. Numerical results demonstrate the convergence properties, robustness and efficiency of the proposed multigrid methods.

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Type
Research Article
Copyright
Copyright © Global Science Press Limited 2012

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