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arXiv 1504.01935math.NAcs.NA
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双障碍相场方法用于不连续扩散系数的反问题

Double obstacle phase field approach to an inverse problem for a discontinuous diffusion coefficient

Otto-von-Guericke-Universität Magdeburg(马格德堡奥托·冯·古里克大学);University of Warwick(华威大学);University of Sussex(萨塞克斯大学)

Klaus Deckelnick, Charles M. Elliott, Vanessa Styles

AI总结:

本文提出双障碍相场方法用于恢复椭圆偏微分方程中的分段常数扩散系数,通过优化控制方法结合正则化项,采用有限元方法进行计算验证。

摘要:

我们提出了一种双障碍相场方法,用于恢复椭圆偏微分方程中的分段常数扩散系数。该反问题的求解方法是优化控制,其中包含一个二次保真项,并添加一个由参数σ加权的周长正则化项。这产生了一个在扩散系数集上优化的功能,这些扩散系数受底层椭圆PDE状态方程约束。为了推导可计算的问题,周长功能通过梯度能量功能和一个具有界面参数ε的障碍势能进行松弛。该相场方法通过证明当ε趋于零时,正则化周长功能的Gamma收敛性得到证明。计算方法基于有限元近似。这种离散化被证明以适当的方式收敛到相场问题的解。我们推导出一种迭代方法,证明其产生一个能量递减序列,收敛到离散极值点。该方法的有效性通过数值实验加以说明。

英文摘要:

We propose a double obstacle phase field approach to the recovery of piece-wise constant diffusion coefficients for elliptic partial differential equations. The approach to this inverse problem is that of optimal control in which we have a quadratic fidelity term to which we add a perimeter regularisation weighted by a parameter sigma. This yields a functional which is optimised over a set of diffusion coefficients subject to a state equation which is the underlying elliptic PDE. In order to derive a problem which is amenable to computation the perimeter functional is relaxed using a gradient energy functional together with an obstacle potential in which there is an interface parameter epsilon. This phase field approach is justified by proving Gamma-convergence to the functional with perimeter regularisation as epsilon tends to zero. The computational approach is based on a finite element approximation. This discretisation is shown to converge in an appropriate way to the solution of the phase field problem. We derive an iterative method which is shown to yield an energy decreasing sequence converging to a discrete critical point. The efficacy of the approach is illustrated with numerical experiments.

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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