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• W2792691366 abstract "We present a fast algorithm for the computation of stiffness matrices in Isogeometric Analysis with tensor product spline spaces, for both scalar and vector-valued problems. The procedure exploits the facts that (a) such matrices have block-banded structure, and (b) they often have low Kronecker rank. Combined, these two properties allow us to reorder the nonzero entries of the stiffness matrix into a relatively small, dense matrix or tensor of low rank. A suitable black-box low-rank approximation algorithm is then applied to this matrix or tensor. This allows us to approximate the nonzero entries of the stiffness matrix while explicitly computing only relatively few of them, leading to a fast assembly procedure. The algorithm does not require any further knowledge of the used spline spaces, the geometry transform, or the partial differential equation, and thus is black-box in nature. Existing assembly routines can be reused with minor modifications. A reference implementation is provided which can be integrated into existing code. Numerical examples demonstrate significant speedups over a standard Gauss quadrature assembler for several geometries in two and three dimensions. The runtime scales sublinearly with the number of degrees of freedom in a large pre-asymptotic regime." @default.
• W2792691366 created "2018-03-29" @default.
• W2792691366 creator A5084947066 @default.
• W2792691366 date "2018-05-01" @default.
• W2792691366 modified "2023-10-14" @default.
• W2792691366 title "A black-box low-rank approximation algorithm for fast matrix assembly in Isogeometric Analysis" @default.
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• W2792691366 doi "https://doi.org/10.1016/j.cma.2018.01.014" @default.
• W2792691366 hasPublicationYear "2018" @default.
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