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• W4377018038 abstract "The main result of the work is the generalization of the concept of the variational splitting from [3] to the higher-order generalized-α schemes proposed in [5] in the context of hyperbolic and elastic wave propagation problems. It is possible to factorize the matrix of the linear system of equations (M+ηK) in the linear computational cost. Here M is the mass matrix, and K is the stiffness matrix. We discretize using the isogeometric finite element method. Following the idea proposed in [3], factorizing the matrix (M+ηK), we obtained an additional error of the order of η2. This paper introduces a technique to couple the possibility of fast factorization of (M+ηK) with higher-order generalized-α schemes proposed in [5] for hyperbolic and elastic wave propagation problems. Thus, we introduce a variationally separable splitting technique for the high-order accuracy generalized-α method. We use tensor-product meshes to develop the splitting method, which results in the linear cost for multi-dimensional problems. We consider standard C0 finite elements as well as smoother isogeometric analysis for spatial discretization. The direction splitting method requires the mass and the stiffness matrices to have the Kronecker product structure. For other problems, the corresponding Kronecker product solver can be employed as a preconditioner as long as a Kronecker product can sufficiently well approximate the problem matrix. We also study the spectrum of the amplification matrix to establish the unconditional stability of the method. We use various examples to demonstrate the performance of the method and the optimal approximation accuracy. In numerical tests, we compute the L2 and H1 norms to show the optimal convergence of the discrete method in space and high-order accuracy in time." @default.
• W4377018038 created "2023-05-19" @default.
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• W4377018038 date "2023-07-01" @default.
• W4377018038 modified "2023-10-16" @default.
• W4377018038 title "A Kronecker product linear-cost solver for the high-order generalized-α method for multi-dimensional hyperbolic systems" @default.
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• W4377018038 doi "https://doi.org/10.1016/j.camwa.2023.04.043" @default.
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