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arXiv 1911.08029math.NAcs.NA
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曲面上双调和方程的分段线性元混合有限元法

A mixed finite element method with piecewise linear elements for the biharmonic equation on surfaces

Oded Stein, Eitan Grinspun, Alec Jacobson, Max Wardetzky

摘要:

对于R2中的区域,用混合有限元法和三角形元上的分段线性(边界三角形可能除外)有限元离散Dirichlet和Neumann边界条件的双调和方程已经得到了很好的研究。这里我们研究多面体曲面上的类似问题。特别地,我们给出了双调和方程的离散解到相应光滑解的收敛性证明。我们得到的收敛速度是相同的已知的平面设置。我们的证明集中在三个不同的问题上:求解曲面上的双调和方程,在曲面度量下求解离散空间中的双调和方程,在曲面多面体近似度量下求解离散空间中的双调和方程.我们使用逆离散拉普拉斯算子来限制两个离散问题的解之间的误差,并推广了一个平坦的策略来限制曲面上的离散解和精确解之间的剩余误差。

英文摘要:

The biharmonic equation with Dirichlet and Neumann boundary conditions discretized using the mixed finite element method and piecewise linear (with the possible exception of boundary triangles) finite elements on triangular elements has been well-studied for domains in R2. Here we study the analogous problem on polyhedral surfaces. In particular, we provide a convergence proof of discrete solutions to the corresponding smooth solution of the biharmonic equation. We obtain convergence rates that are identical to the ones known for the planar setting. Our proof focuses on three different problems: solving the biharmonic equation on the surface, solving the biharmonic equation in a discrete space in the metric of the surface, and solving the biharmonic equation in a discrete space in the metric of the polyhedral approximation of the surface. We employ inverse discrete Laplacians to bound the error between the solutions of the two discrete problems, and generalize a flat strategy to bound the remaining error between the discrete solutions and the exact solution on the curved surface.

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