Multilevel space-time block diagonal preconditioners for parabolic problems
Multilevel space-time block diagonal preconditioners for parabolic problems
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用于抛物线问题的多级时空块对角预处理器
DOI:
10.1016/j.aml.2020.106432
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发表时间:
2020-04
影响因子:
3.7
通讯作者:
Li Shishun
中科院分区:
文献类型:
--
作者:
Shao Xinping;Zhang Ruyi;Li Shishun
We present and investigate two new robust space–time preconditioned GMRES methods for solving linear system of equations arising from the discretization of parabolic equations. With these methods, a block diagonal linear system instead of a block lower bidiagonal linear system will be solved in each space–time subdomain. It shows that this technique can reduce the cost of the computation and memory overhead. We develop an optimal convergence theory which shows that convergence rate is bounded independently of the spatial mesh sizes, the time step size, the number of subdomains, the number of levels and the window size. Some numerical results are reported to confirm the theory in terms of optimality and scalability. Moreover, numerical comparisons with space–time additive Schwarz algorithm are also given to show the actual competitiveness our proposed space–time methods.
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