Simulation of coarsening in two-phase systems with dissimilar mobilities

•Dissimilar mobilities and dimensionality (2D vs. 3D) both substantially affect coarsening kinetics and morphology.•High-mobility regions are discontinuous in 2D and continuous in 3D, leading to contrasting dynamics.•An analytical model is proposed that relates coarsening kinetics to morphology in 3D.•Effect of dissimilar mobilities on kinetics in 3D consists of change in average mobility offset by changes in morphology.