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arXiv 1805.03255math.NAcs.NA
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一种固定网格与浸入有限元相结合的方法用于求解界面反问题

A Fixed Mesh Method With Immersed Finite Elements for Solving Interface Inverse Problems

Virginia Tech(弗吉尼亚理工大学);Hong Kong Polytechnic University(香港理工大学)

Ruchi Guo, Tao Lin, Yanping Lin

AI总结:

本文提出了一种固定网格方法,结合浸入有限元技术,用于解决一类典型的椭圆界面反问题。该方法将界面反问题转化为形状优化问题,通过在固定网格上使用浸入有限元方法对 governing partial differential equations 和目标函数进行最优离散化,从而实现高效准确的求解。

摘要:

我们提出了一种新的固定网格算法,用于解决一类典型的椭圆界面反问题。这些界面反问题被转化为形状优化问题,其目标函数依赖于界面的形状。无论界面的位置如何,通过在固定网格上使用浸入有限元方法,都可以针对涉及的多项式空间对 governing partial differential equations 和目标函数进行最优离散化。此外,通过离散的伴随过程,推导出离散目标函数梯度的公式,该公式能够高效准确地计算。该方法基于固定网格的浸入有限元特性,通过应用于三个代表性的界面反问题:具有子域内部测量的界面反问题、边界上给定数据的狄利克雷-Neumann型反问题以及热耗散设计问题,展示了其特性。

英文摘要:

We present a new fixed mesh algorithm for solving a class of interface inverse problems for the typical elliptic interface problems. These interface inverse problems are formulated as shape optimization prob- lems whose objective functionals depend on the shape of the interface. Regardless of the location of the interface, both the governing partial differential equations and the objective functional are discretized optimally, with respect to the involved polynomial space, by an immersed finite element (IFE) method on a fixed mesh. Furthermore, the formula for the gradient of the descritized objective function is de- rived within the IFE framework that can be computed accurately and efficiently through the discretized adjoint procedure. Features of this proposed IFE method based on a fixed mesh are demonstrated by its applications to three representative interface inverse problems: the interface inverse problem with an internal measurement on a sub-domain, a Dirichlet-Neumann type inverse problem whose data is given on the boundary, and a heat dissipation design problem.

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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