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arXiv 2201.06632math.NAcs.CEcs.NA
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基于插值离散延拓的鲁棒高阶非拟合有限元

Robust high-order unfitted finite elements by interpolation-based discrete extension

Santiago Badia, Eric Neiva, Francesc Verdugo

摘要:

在这项工作中,我们提出了一个新的配方的解决方案的偏微分方程使用有限元法的非拟合网格。所提出的配方依赖于离散扩展运营商提出的聚合有限元法。该公式相对于单元内的边界/界面的位置是稳健的。可以证明增强的稳定性结果,不仅在物理域上,但在整个活动网格。然而,稳定常数随着所使用的多项式阶数呈指数增长,因为底层的扩展算子是通过外推定义的。为了解决这个问题,我们引入了一个新的变种聚合有限元,在物理域中的扩展是一个插值多项式的阶数高于2。因此,稳定常数仅以近似阶数的多项式速率增长。我们证明,这种方法使强大的高阶近似的聚合有限元法。所提出的方法是一致的,最佳收敛,并与一个条件数,最佳尺度高阶近似。

英文摘要:

In this work, we propose a novel formulation for the solution of partial differential equations using finite element methods on unfitted meshes. The proposed formulation relies on the discrete extension operator proposed in the aggregated finite element method. This formulation is robust with respect to the location of the boundary/interface within the cell. One can prove enhanced stability results, not only on the physical domain, but on the whole active mesh. However, the stability constants grow exponentially with the polynomial order being used, since the underlying extension operators are defined via extrapolation. To address this issue, we introduce a new variant of aggregated finite elements, in which the extension in the physical domain is an interpolation for polynomials of order higher than two. As a result, the stability constants only grow at a polynomial rate with the order of approximation. We demonstrate that this approach enables robust high-order approximations with the aggregated finite element method. The proposed method is consistent, optimally convergent, and with a condition number that scales optimally for high order approximation.

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