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The optimal 3-node preconditioner of the d2dx2 Fourier and Chebyshev spectral operators

机译:d2dx2傅里叶和Chebyshev谱算子的最佳3节点预处理器

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摘要

It is shown in [G. Labrosse, The piecewise-linear Finite Volume scheme: the best known lowest-order preconditioner for the d2dx2 Chebyshev spectral operator, J. Comput. Phys. 228 (2009) 4491-4509] that the piecewise-linear Finite Volume (FV) approximation is the best preconditioner of the L[u]≡d2udx2=f Fourier and Chebyshev solvers compared to the corresponding 3-node Finite Difference (FD) and Finite Element (FE) approximations. The present paper reports about a 3-node preconditioner which, constructed from an appropriate linear combination of these FD, FE and FV approximations, is significantly better than the FV approximation. It is shown to be optimal.
机译:它显示在[G. Labrosse,分段线性有限体积方案:最著名的d2dx2 Chebyshev谱算子的最低阶预处理器,J。Comput。物理[228(2009)4491-4509]认为,与相应的3节点有限差分(FD)相比,分段线性有限体积(FV)逼近是L [u] d2udx2 = f Fourier和Chebyshev求解器的最佳前置条件。有限元(FE)近似值。本论文报道了一个三节点预处理器,它由这些FD,FE和FV近似值的适当线性组合构成,明显优于FV近似值。它显示为最佳。

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