Logarithm of the gas surface density in the high-viscosity model, at time t = 3300 T. As for the base model, the simulation uses overlapping polar grids that extend out to 144 a. The left and centre panels show the circumbinary disc, whereas the right panel shows the circumprimary disc. The secondary star is located at the pericentre of its orbit. The colour bar represents Σ in units of M_A/a². For the adopted system parameters, a density of 10⁻² corresponds to ≈310 g cm⁻².