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arXiv 2103.16699math.NAcs.NA
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初始温度重建的时空有限元法

Space-time finite element methods for the initial temperature reconstruction

Ulrich Langer, Olaf Steinbach, Fredi Tröltzsch, Huidong Yang

摘要:

利用Steinbach(2015)提出的时空有限元法,在完全非结构化的时空单纯网格上,对后向热传导方程中的初始温度进行了重建。这样一个严重不适定的问题是由标准的Tikhonov正则化方法。这导致一个相关的最优控制的抛物型方程在空间-时域。在这种设置中,控制被视为初始条件,而终端观测数据作为目标。目标成为一个标准的终端观察功能结合Tikhonov正则化。将时空有限元法应用于对固定正则化参数适定的时空最优系统。

英文摘要:

This work is devoted to the reconstruction of the initial temperature in the backward heat equation using the space-time finite element method on fully unstructured space-time simplicial meshes proposed by Steinbach (2015). Such a severely ill-posed problem is tackled by the standard Tikhonov regularization method. This leads to a related optimal control for an parabolic equation in the space-time domain. In this setting, the control is taken as initial condition, whereas the terminal observation data serve as target. The objective becomes a standard terminal observation functional combined with the Tikhonov regularization. The space-time finite element method is applied to the space-time optimality system that is well-posed for a fixed regularization parameter.

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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