arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1908.05245math.NAcs.NA
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基于多谐波粗网格校正的时间周期问题的快速求解

Efficient Parallel-in-Time Solution of Time-Periodic Problems Using a Multi-Harmonic Coarse Grid Correction

Iryna Kulchytska-Ruchka, Sebastian Schöps

摘要:

本文提出了一种有效解非线性时间周期问题的高度并行算法。它基于Parareal方法的时间周期扩展,已知通过细网格上的并行化来加速顺序计算。该方法通过引入一个简化的牛顿算法,允许在粗网格上进行额外的并行化,从而降低了周期Parareal解的复杂性。特别地,在每次牛顿迭代时,执行多谐波校正,其将时域中的块循环周期系统转换为频域中的块对角系统,从而并行地求解每个频率分量。对一个一维模型问题讨论了该方法的收敛性。介绍的算法和几个现有的解决方案的方法进行了比较,通过他们的应用程序的涡流问题的线性和非线性模型的同轴电缆。所考虑的方法的性能也说明了一个三维的Transformer模型。

英文摘要:

This paper presents a highly-parallelizable parallel-in-time algorithm for efficient solution of nonlinear time-periodic problems. It is based on the time-periodic extension of the Parareal method, known to accelerate sequential computations via parallelization on the fine grid. The proposed approach reduces the complexity of the periodic Parareal solution by introducing a simplified Newton algorithm, which allows an additional parallelization on the coarse grid. In particular, at each Newton iteration a multi-harmonic correction is performed, which converts the block-cyclic periodic system in the time domain into a block-diagonal system in the frequency domain, thereby solving for each frequency component in parallel. The convergence analysis of the method is discussed for a one-dimensional model problem. The introduced algorithm and several existing solution approaches are compared via their application to the eddy current problem for both linear and nonlinear models of a coaxial cable. Performance of the considered methods is also illustrated for a three-dimensional transformer model.

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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