A substructuring method for phase change modelling in hybrid media

We investigate the numerical capabilities of a substructuring algorithm applied to the enthalpy equation in a composite made of graphite and salt. Temperature jumps due to the resistance at the interface between the two materials, as well as the discontinuous conductivity, require to be handled and to be treated in an appropriate way. We propose to solve the enthalpy equation locally in both components (in graphite and salt) where temperature is continuous, while a condensed problem is used to describe the discontinuity at the interface and it is solved by an iterative technique like GMRES algorithm.