arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2105.02007math.NAcs.CEcs.NA
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时空多层quadrature方法及其在心脏电生理中的应用

Space-time multilevel quadrature methods and their application for cardiac electrophysiology

Seif Ben Bader, Helmut Harbrecht, Rolf Krause, Michael Multerer, Alessio Quaglino, Marc Schmidlin

摘要:

我们提出了一种新的方法,旨在高性能的心脏电生理模拟的不确定性量化。采用单域方程来模拟心脏细胞内的跨膜电位,我们评估了心脏纤维的空间相关扰动对所产生的感兴趣的量的统计的影响。我们的方法依赖于多层次的积分方法,并行迭代求解器和时空有限元离散的紧密结合,允许在空间,时间和随机的完全并行化的框架。广泛的数值研究,以评估收敛速度和比较经典的蒙特卡罗方法,如标准蒙特卡罗(MC)和拟蒙特卡罗方法(QMC),以及多级策略,即多级蒙特卡罗(MLMC)和多级拟蒙特卡罗方法(MLQMC)的嵌套网格层次的性能。最后,我们采用了最近提出的非嵌套网格的多层次方法的变体来处理一个现实的心脏几何形状。

英文摘要:

We present a novel approach which aims at high-performance uncertainty quantification for cardiac electrophysiology simulations. Employing the monodomain equation to model the transmembrane potential inside the cardiac cells, we evaluate the effect of spatially correlated perturbations of the heart fibers on the statistics of the resulting quantities of interest. Our methodology relies on a close integration of multilevel quadrature methods, parallel iterative solvers and space-time finite element discretizations, allowing for a fully parallelized framework in space, time and stochastics. Extensive numerical studies are presented to evaluate convergence rates and to compare the performance of classical Monte Carlo methods such as standard Monte Carlo (MC) and quasi-Monte Carlo (QMC), as well as multilevel strategies, i.e. multilevel Monte Carlo (MLMC) and multilevel quasi-Monte Carlo (MLQMC) on hierarchies of nested meshes. Finally, we employ a recently suggested variant of the multilevel approach for non-nested meshes to deal with a realistic heart geometry.

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