Abdulle, AssyrHuber, Martin E.Lemaire, Simon2016-08-172016-08-172016-08-17201710.1016/j.crma.2017.02.010https://infoscience.epfl.ch/handle/20.500.14299/128727WOS:000401940000017A new optimization-based numerical method is proposed for the solution to diffusion problems with sign-changing conductivity coefficients. In contrast to existing approaches, our method does not rely on the discretization of a stabilized equation and the convergence of the scheme can be proved without any symmetry assumption on the mesh near the interface where the conductivity sign changes.text::journal::journal article::research article