Abstract
We propose two iterative numerical methods for eigenvalue computations of large dimensional problems arising from finite approximations of integral operators, and describe their parallel implementation. A matrix representation of the problem on a space of moderate dimension, defined from an infinite dimensional one, is computed along with its eigenpairs. These are taken as initial approximations and iteratively refined, by means of a correction equation based on the reduced resolvent operator and performed on the moderate size space, to enhance their quality. Each refinement step requires the prolongation of the correction equation solution back to a higher dimensional space, defined from the infinite dimensional one. This approach is particularly adapted for the computation of eigenpair approximations of integral operators, where prolongation and restriction matrices can be easily built making a bridge between coarser and finer discretizations. We propose two methods that apply a Jacobi–Davidson like correction: Multipower Defect-Correction (MPDC), which uses a single-vector scheme, if the eigenvalues to refine are simple, and Rayleigh–Ritz Defect-Correction (RRDC), which is based on a projection onto an expanding subspace. Their main advantage lies in the fact that the correction equation is performed on a smaller space while for general solvers it is done on the higher dimensional one. We discuss implementation and parallelization details, using the PETSc and SLEPc packages. Also, numerical results on an astrophysics application, whose mathematical model involves a weakly singular integral operator, are presented.
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This work was partially supported by European Regional Development Fund through COMPETE, FCT—Fundação para a Ciência e a Tecnologia through CMUP—Centro de Matemática da Universidade do Porto and Spanish Ministerio de Ciencia e Innovación under projects TIN2009-07519 and AIC10-D-000600.
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Vasconcelos, P.B., d’Almeida, F.D. & Roman, J.E. A Jacobi–Davidson type method with a correction equation tailored for integral operators . Numer Algor 64, 85–103 (2013). https://doi.org/10.1007/s11075-012-9656-9
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DOI: https://doi.org/10.1007/s11075-012-9656-9