Coplanar simulations, comparison between the initial behaviour shown with the same density and spatial scales. The cyan dots show the position of the binary. Left panels: evolution of the gas surface density in the coplanar 1 simulation for face-on views at different orbital time steps, at 10 (top left), 40 (top right), 80 (bottom left), and 120 (bottom right) T_copl. The simulation is not forming an over-density in the gas. Right panels: evolution of the gas surface density in the coplanar 2 simulation, at the same times. In both cases, the cavity remains circular. The initial snapshots of coplanar 2 also show how the initial accretion of material around the stars leads to the formation of circumstellar discs, quickly accreted due to low numerical resolution.