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A comparison of coupled and uncoupled solversfor the cardiac Bidomain model∗∗∗

Published online by Cambridge University Press:  07 June 2013

P. Colli Franzone ,
L. F. Pavarino  and
S. Scacchi
P. Colli Franzone
Affiliation:
Dipartimento di Matematica, Università di Pavia, Via Ferrata, 27100 Pavia, Italy.. colli@imati.cnr.it
L. F. Pavarino
Affiliation:
Dipartimento di Matematica, Università di Milano, Via Saldini 50, 20133 Milano, Italy.; luca.pavarino@unimi.it; simone.scacchi@unimi.it
S. Scacchi
Affiliation:
Dipartimento di Matematica, Università di Milano, Via Saldini 50, 20133 Milano, Italy.; luca.pavarino@unimi.it; simone.scacchi@unimi.it
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Abstract

The aim of this work is to compare a new uncoupled solver for the cardiac Bidomain model with a usual coupled solver. The Bidomain model describes the bioelectric activity of the cardiac tissue and consists of a system of a non-linear parabolic reaction-diffusion partial differential equation (PDE) and an elliptic linear PDE. This system models at macroscopic level the evolution of the transmembrane and extracellular electric potentials of the anisotropic cardiac tissue. The evolution equation is coupled through the non-linear reaction term with a stiff system of ordinary differential equations (ODEs), the so-called membrane model, describing the ionic currents through the cellular membrane. A novel uncoupled solver for the Bidomain system is here introduced, based on solving twice the parabolic PDE and once the elliptic PDE at each time step, and it is compared with a usual coupled solver. Three-dimensional numerical tests have been performed in order to show that the proposed uncoupled method has the same accuracy of the coupled strategy. Parallel numerical tests on structured meshes have also shown that the uncoupled technique is as scalable as the coupled one. Moreover, the conjugate gradient method preconditioned by Multilevel Hybrid Schwarz preconditioners converges faster for the linear systems deriving from the uncoupled method than from the coupled one. Finally, in all parallel numerical tests considered, the uncoupled technique proposed is always about two or three times faster than the coupled approach.

Keywords

Operator splittingmultilevel preconditionersparallel computing
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 47 , Issue 4: Direct and inverse modeling of the cardiovascular and respiratory systems , July 2013 , pp. 1017 - 1035
Copyright
© EDP Sciences, SMAI, 2013

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