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Stable computation of the functional variation of the Dirichlet-Neumann operator

机译:稳定计算Dirichlet-Neumann算子的函数变异

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This paper presents an accurate and stable numerical scheme for computation of the first variation of the Dirichlet-Neumann operator in the context of Euler's equations for ideal free-surface fluid flows. The Transformed Field Expansion methodology we use is not only numerically stable, but also employs a spectrally accurate Fourier/Chebyshev collocation method which delivers high-fidelity solutions. This implementation follows directly from the authors' previous theoretical work on analyticity properties of functional variations of Dirichlet-Neumann operators. These variations can be computed in a number of ways, but we establish, via a variety of computational experiments, the superior effectiveness of our new approach as compared with another popular Boundary Perturbation algorithm (the method of Operator Expansions).
机译:本文针对理想自由表面流体流动的欧拉方程,提出了一种精确稳定的数值方案,用于计算Dirichlet-Neumann算子的第一个变化。我们使用的“变换场扩展”方法不仅在数值上稳定,而且采用频谱精确的傅里叶/切比雪夫搭配方法,可提供高保真度的解决方案。此实现直接基于作者先前关于Dirichlet-Neumann算子的函数变异的解析性质的理论工作。这些变化可以通过多种方式进行计算,但是我们通过各种计算实验证明了我们的新方法与另一种流行的边界摄动算法(算子扩展方法)相比具有更高的有效性。

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