arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.01612math.NAcs.NA
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线性隐式GARK格式

Linearly implicit GARK schemes

Adrian Sandu, Michael Günther, Steven Roberts

摘要:

由多个物理过程驱动的系统是许多科学和工程领域的核心。多物理场系统的时间离散化具有挑战性,因为不同的过程具有不同的刚度和特征时间尺度。多方法的方法离散化每个物理过程与适当的数值方法的方法适当耦合,使整体解决方案具有所需的精度和稳定性。作者发展了广义结构可加Runge-Kutta(GARK)框架,它构造了基于Runge-Kutta格式的多方法。本文基于线性隐式Rosenbrock/Rosenbrock-W格式构造了新的GARK-ROS/GARK-ROW多重方法族。对于常微分方程模型,我们利用精确或近似雅可比矩阵,发展了一个适用于任意分割数的线性隐式方法的一般序条件理论。本文将序条件理论推广到双向分块指数为1的微分代数方程方程。该框架的应用包括解耦线性隐式,线性隐式/显式,线性隐式/隐式方法。实用的GARK-ROS和GARK-ROW格式的阶数可达4。

英文摘要:

Systems driven by multiple physical processes are central to many areas of science and engineering. Time discretization of multiphysics systems is challenging, since different processes have different levels of stiffness and characteristic time scales. The multimethod approach discretizes each physical process with an appropriate numerical method; the methods are coupled appropriately such that the overall solution has the desired accuracy and stability properties. The authors developed the general-structure additive Runge-Kutta (GARK) framework, which constructs multimethods based on Runge-Kutta schemes. This paper constructs the new GARK-ROS/GARK-ROW families of multimethods based on linearly implicit Rosenbrock/Rosenbrock-W schemes. For ordinary differential equation models, we develop a general order condition theory for linearly implicit methods with any number of partitions, using exact or approximate Jacobians. We generalize the order condition theory to two-way partitioned index-1 differential-algebraic equations. Applications of the framework include decoupled linearly implicit, linearly implicit/explicit, and linearly implicit/implicit methods. Practical GARK-ROS and GARK-ROW schemes of order up to four are constructed.

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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