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• Comparison of finite element and discrete exterior calculus in computation of time-harmonic wave propagation with controllability 

  Saksa, Tytti (Elsevier, 2025)

  This paper discusses computation of time-harmonic wave problems using a mixed formulation and the controllability method introduced by Roland Glowinski. As an example, a scattering problem (in an exterior domain) is ...

• Time-harmonic solution for acousto-elastic interaction with controllability and spectral elements 

  Mönkölä, Sanna (Elsevier, 2010)

  The classical way of solving the time-harmonic linear acousto-elastic wave problem is to discretize the equations with finite elements or finite differences. This approach leads to large-scale indefinite complex-valued ...

• A damping preconditioner for time-harmonic wave equations in fluid and elastic material 

  Airaksinen, Tuomas; Pennanen, Anssi; Toivanen, Jari (Elsevier, 2009)

  A physical damping is considered as a preconditioning technique for acoustic and elastic wave scattering. The earlier preconditioners for the Helmholtz equation are generalized for elastic materials and three-dimensional ...

• A graph-based multigrid with applications 

  Pennanen, Anssi (University of Jyväskylä, 2010)

• Time-harmonic electromagnetics with exact controllability and discrete exterior calculus 

  Mönkölä, Sanna; Räbinä, Jukka; Rossi, Tuomo (Academie des Sciences, 2023)

  In this paper, we apply the exact controllability concept for time-harmonic electromagnetic scattering. The problem is presented in terms of the differential forms, and the discrete exterior calculus is utilized for spatial ...