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Error analysis of multipoint flux domain decomposition methods for evolutionary diffusion problems

机译:演化扩散问题的多点通量域分解方法的误差分析

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摘要

We study space and time discretizations for mixed formulations of parabolic problems. The spatial approximation is based on the multipoint flux mixed finite element method, which reduces to an efficient cell-centered pressure system on general grids, including triangles, quadrilaterals, tetrahedra, and hexahedra. The time integration is performed by using a domain decomposition time-splitting technique combined with multiterm fractional step diagonally implicit Runge-Kutta methods. The resulting scheme is unconditionally stable and computationally efficient, as it reduces the global system to a collection of uncoupled subdomain problems that can be solved in parallel without the need for Schwarz-type iteration. Convergence analysis for both the semidiscrete and fully discrete schemes is presented.
机译:我们研究抛物线问题的混合形式的时空离散。空间逼近基于多点通量混合有限元方法,该方法可简化为通用网格(包括三角形,四边形,四面体和六面体)上以单元为中心的有效压力系统。通过使用域分解时间分割技术与多项分数步对角隐式Runge-Kutta方法相结合来执行时间积分。生成的方案无条件稳定且计算效率高,因为它将全局系统简化为未耦合子域问题的集合,这些子问题可以并行解决而无需Schwarz类型的迭代。提出了半离散和完全离散方案的收敛性分析。

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