Optimal order multigrid preconditioners for the distributed control of parabolic equations with coarsening in space and time
Optimal order multigrid preconditioners for the distributed control of parabolic equations with coarsening in space and time
复制标题
用于空间和时间粗化抛物型方程分布式控制的最优阶多重网格预处理器
DOI:
10.1080/10556788.2021.2022145
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发表时间:
2022
影响因子:
2.2
通讯作者:
Hajghassem, Mona
中科院分区:
文献类型:
--
作者:
Drăgănescu, Andrei;Hajghassem, Mona
We devise multigrid preconditioners for linear-quadratic space-time distributed parabolic optimal control problems. While our method is rooted in earlier work on elliptic control, the temporal dimension presents new challenges in terms of algorithm design and quality. Our primary focus is on the cG(s)dG(r) discretizations which are based on functions that are continuous in space and discontinuous in time, but our technique is applicable to various other space-time finite element discretizations. We construct and analyse two kinds of multigrid preconditioners: the first is based on full coarsening in space and time, while the second is based on semi-coarsening in space only. Our analysis, in conjunction with numerical experiments, shows that both preconditioners are of optimal order with respect to the discretization in case of cG(1)dG(r) forr= 0, 1 and exhibit a suboptimal behaviour in time for Crank–Nicolson. We also show that, under certain conditions, the preconditioner using full space-time coarsening is more efficient than the one involving semi-coarsening in space, a phenomenon that has not been observed previously. Our numerical results confirm the theoretical findings.
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DOI:
10.1137/1.9780898718003
发表时间:
2003-05
期刊:
--
影响因子:
--
作者:
Y. Saad
通讯作者:
Y. Saad
DOI:
10.1090/s0025-5718-08-02100-5
发表时间:
2008
期刊:
Math. Comput.
影响因子:
--
作者:
Andrei Draganescu;T. Dupont
通讯作者:
T. Dupont
影响因子:
2.9
作者:
Draganescu, Andrei;Petra, Cosmin
通讯作者:
Petra, Cosmin
DOI:
--
发表时间:
2007
期刊:
影响因子:
--
作者:
A. Borzì
通讯作者:
A. Borzì
DOI:
10.1090/s0025-5718-03-01533-3
发表时间:
2003
期刊:
Math. Comput.
影响因子:
--
作者:
B. Kaltenbacher
通讯作者:
B. Kaltenbacher