  In this article, an efficient transient electricalthermal co-simulation
method based on the finite element method (FEM) and the discontinuous Galerkin
time-domain (DGTD) method is developed for electrical-thermal coupling analysis
of multiscale structures. Two Independent meshes are adopted by the steady
electrical analysis and the transient thermal simulation to avoid redundant
overhead. In order to enhance the feasibility and efficiency of solving
multiscale and sophisticated structures, a local time stepping (LTS) technique
coupled with an interpolation method is incorporated into the co-simulation
method. Several numerical examples from simple structures to complex multiscale
PDN structures are carried out to demonstrate the accuracy and efficiency of
the proposed method by comparing with the COMSOL. Finally, two practical
numerical examples are considered to confirm the performance of the proposed
method for complex and multiscale structures.
