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arXiv 2309.09151math.NAcs.NA
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具有椭圆型偏微分方程约束的Neumann界面最优控制问题及其离散化与数值分析

A Neumann interface optimal control problem with elliptic PDE constraints and its discretization and numerical analysis

Zhiyue Zhang, Kazufumi Ito, Zhilin Li

AI总结:

本文研究控制作用于界面的椭圆型偏微分方程最优控制问题,提出基于均匀网格的浸入有限元离散方案,并结合后处理超收敛技术与变分离散化概念,获得了控制的最优误差估计和状态变量的次优误差估计。

摘要:

我们研究一个由带界面的椭圆型偏微分方程支配的最优控制问题,其中控制作用在界面上。由于系数在界面两侧存在跳跃且控制作用于界面,控制问题解的正则性在整个区域上受到限制,但在子区域上更为光滑。带逐点不等式约束的控制函数充当通量跳跃条件,我们称之为Neumann界面控制。我们使用与界面无关的简单均匀网格。当采用均匀网格时,标准线性有限元方法无法达到最优收敛。因此,状态方程和伴随状态方程采用分片线性浸入有限元方法(IFEM)进行离散。同时,界面上最优控制的分片常数近似的精度通过一个具有超收敛性质的后处理步骤得到提高;并且采用最优控制的变分离散化概念来改进误差估计。推导出了控制的最优误差估计,以及状态和伴随状态的次优误差估计。提供了带约束和不带约束的数值算例,以说明所提方案的有效性和理论分析的正确性。

英文摘要:

We study an optimal control problem governed by elliptic PDEs with interface, which the control acts on the interface. Due to the jump of the coefficient across the interface and the control acting on the interface, the regularity of solution of the control problem is limited on the whole domain, but smoother on subdomains. The control function with pointwise inequality constraints is served as the flux jump condition which we called Neumann interface control. We use a simple uniform mesh that is independent of the interface. The standard linear finite element method can not achieve optimal convergence when the uniform mesh is used. Therefore the state and adjoint state equations are discretized by piecewise linear immersed finite element method (IFEM). While the accuracy of the piecewise constant approximation of the optimal control on the interface is improved by a postprocessing step which possesses superconvergence properties; as well as the variational discretization concept for the optimal control is used to improve the error estimates. Optimal error estimates for the control, suboptimal error estimates for state and adjoint state are derived. Numerical examples with and without constraints are provided to illustrate the effectiveness of the proposed scheme and correctness of the theoretical analysis.

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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