Time evolution of the magnetic energy (sky blue) and kinetic energy (vermillion) in the simulations of the SSD for different grid resolutions (dotted: 64 × 32 × 64, dot-dashed: 128 × 64 × 128, solid: 192 × 96 × 192). Each panel shows the results obtained with a specific value of b (from left to right: b = 10⁻⁶, 10⁻³, 1). The time is expressed in units of the convective turnover, while the magnetic and kinetic energy curves are rescaled by b^2/3 to take into account the different energy contents of the flows.