Andréa M. P. Valli

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 This paper discusses the implementation of a numerical algorithm for simulating incompressible fluid flows based on the finite difference method and designed for parallel computing platforms with distributed-memory, particularly for clusters of workstations. The solution algorithm for the Navier-Stokes equations utilizes an explicit scheme for pressure(More)
Resumo Devido à crescente demanda por capacidade computacional na resolução de problemas, agregados de computadores (Clusters) vêm se tornando uma das alternativas mais viáveis à utilização de Supercomputadores. Este artigo descreve a instalação, configuração e manutenção do Cluster Enterprise do Laboratório de Alto Desempenho (LCAD) do Departamento de(More)
In this work, we analyze a parallel finite element implementation for multi-core clusters of incompressible miscible displacements in porous media. For that, we compare two alternatives of MPI jobs scheduling on the clusters' cores. One of them, named fill-up, schedules jobs to all cores of a Central Processing Unit (CPU) of a cluster before considering the(More)
SUMMARY In this work, we evaluate the performance of the left conjugate direction method (LCD) for the solution of non-symmetric systems of linear equations arising from ÿnite element and ÿnite diierence discretizations of the convection–diiusion equation. We extend the LCD algorithm proposed by Dai and Yuan (Int. to accommodate restarts. Our discussion(More)
This paper evaluates the effects of reordering the unknowns on the convergence of preconditioned Krylov subspace methods for the solution of nonsymmetric linear systems that arise from the finite element discretization of flow and transport. Of particular interest is the iterative solver behavior when adaptive mesh refinement (AMR) is utilized. Numerical(More)
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