Simulation results of models A₂₁ and A₂₂ in Table 1. Left: evolution of central density (in 10⁹ g cm⁻³), radius (in 10⁸ cm), and angular velocity Ω. Solid lines correspond to model A₂₁ (5 × 10⁵ particles) and dashed lines to model A₂₂ (2 × 10⁶ particles). Once the periodic resetting to zero of the velocities is removed at t = 2.5 s, the central density remains stable during several sound-crossing times (t_sc ≃ 0.4 s). Right: density color map and isodensity contours of a 2D meridional slice of the rotating WD at t = 2.5 s. The slice has a thickness of four times the local smoothing length (4 h), which represents roughly 10% of the total number of particles. Making cuts with the local value of h ensures a similar number of particles at any region of the color map.