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arXiv 2109.11276math.NAcs.NA
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一类$3\times 3$块鞍点问题的新块对角预条件子

A new block diagonal preconditioner for a class of $3\times 3$ block saddle point problems

Maryam Abdolmaleki, Saeed Karimi, Davod Khojasteh Salkuyeh

摘要:

研究了一类$3\times3$块鞍点问题的块预条件子的性能,这些问题是由求解含时Maxwell方程的有限元法和其它一些实际问题引起的.我们还估计了预条件矩阵特征值的上下上界。\cred {最后,我们测试了我们的新预条件子,以加快GMRES方法的收敛速度,这表明了预条件子的有效性。

英文摘要:

We study the performance of a new block preconditioner for a class of $3\times3$ block saddle point problems which arise from finite element methods for solving time-dependent Maxwell equations and some other practical problems. We also estimate the lower and upper bounds of eigenvalues of the preconditioned matrix. \cred{Finally, we examine our new preconditioner to accelerate the convergence speed of the GMRES method which shows the effectiveness of the preconditioner.

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