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• W2793832011 abstract "We consider the efficient solution of sequences of linear systems arising in the numerical solution of a branched transport model whose long time solution for specific parameter settings is equivalent to the solution of the Monge–Kantorovich equations of optimal transport. Galerkin Finite Element discretization combined with explicit Euler time stepping yield a linear system to be solved at each time step, characterized by a large sparse very ill conditioned symmetric positive definite (SPD) matrix A. Extreme cases even prevent the convergence of Preconditioned Conjugate Gradient (PCG) with standard preconditioners such as an Incomplete Cholesky (IC) factorization of A, which cannot always be computed. We investigate several preconditioning strategies that incorporate partial approximated spectral information. We present numerical evidence that the proposed techniques are efficient in reducing the condition number of the preconditioned systems, thus decreasing the number of PCG iterations and the overall CPU time." @default.
• W2793832011 created "2018-03-29" @default.
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• W2793832011 date "2019-07-01" @default.
• W2793832011 modified "2023-10-17" @default.
• W2793832011 title "Spectral preconditioners for the efficient numerical solution of a continuous branched transport model" @default.
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• W2793832011 doi "https://doi.org/10.1016/j.cam.2018.01.022" @default.
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