Fig. 2. Schematic representation of the main ideas presented in this work. The proposed protocol aims to bridge the nano and macroscale. The nanoscopic explicit modeling of the material is needed to accurately simulate the Joule effect and heat diffusion, that is modeled by using a grid based picture allowing the connection to the macroscale, from which the external voltage is taken. In this schematic representation on the connecting arrows we underline the main quantities simulated at the nanoscale and transferred to the macroscale through the bridging grid picture.