A stabilized DG-type method for solving efficiently Helmholtz problems

Abstract : We propose a stabilized discontinuous Galerkin-type method (SDGM) for solving efficiently Helmholtz problems. This mixed-hybrid formulation is a two-step procedure. Step 1 consists in solving well-posed problems at the element partition level of the computational domain, whereas Step 2 requires the solution of a global system whose unknowns are the Lagrange multipliers. The main features of SDGM include: (a) the resulting local problems are associated with small positive definite Hermitian matrices that can be solved in parallel, and (b) the matrix corresponding to the global linear system arising in Step 2 is Hermitian and positive semi-definite. Illustrative numerical results for two-dimensional waveguide problems highlight the potential of SDGM for solving efficiently Helmholtz problems in mid- and high-frequency regime.
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https://hal.inria.fr/inria-00537983
Contributor : Magdalena Grigoroscuta-Strugaru <>
Submitted on : Wednesday, January 26, 2011 - 11:33:31 AM
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Mohamed Amara, Henri Calandra, Rabia Djellouli, Magdalena Grigoroscuta-Strugaru. A stabilized DG-type method for solving efficiently Helmholtz problems. [Research Report] RR-7461, INRIA. 2010, pp.30. ⟨inria-00537983v2⟩

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