arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2001.08824math.NAcs.NA
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多物理场系统解中数值误差的面向目标的后验估计

Goal-oriented a posteriori estimation of numerical errors in the solution of multiphysics systems

Mahesh Narayanamurthi, Ulrich Römer, Adrian Sandu

摘要:

本文发展了一种在含时多物理场数值模拟中后验误差估计的一般方法。该方法建立在广义结构添加剂龙格-库塔(GARK)的时间积分方法。GARK提供了一个统一的多方法公式,通过对系统的各个组件应用不同的离散化公式和/或不同的时间步长来模拟复杂系统。我们推导了离散GARK伴随并分析了它们的时间精度。基于伴随方法,我们建立了时间和空间离散化误差对给定目标函数影响的可计算后验恒等式。反应扩散系统的数值例子说明了推导的误差措施的准确性。局部误差分解用于说明该框架在时间和空间网格的自适应细化中的能力。

英文摘要:

This paper develops a general methodology for a posteriori error estimation in time-dependent multiphysics numerical simulations. The methodology builds upon the generalized-structure additive Runge--Kutta (GARK) approach to time integration. GARK provides a unified formulation of multimethods that simulate complex systems by applying different discretization formulas and/or different time steps to individual components of the system. We derive discrete GARK adjoints and analyze their time accuracy. Based on the adjoint method, we establish computable a posteriori identities for the impacts of both temporal and spatial discretization errors on a given goal function. Numerical examples with reaction-diffusion systems illustrate the accuracy of the derived error measures. Local error decompositions are used to illustrate the power of this framework in adaptive refinements of both temporal and spatial meshes.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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