Time evolution for a selection of volume-averaged quantities, whereby the first image shows quantities related to the magnetic field and the second image depicts the turbulent stresses. First image: left axis, dashed and dotted lines: box-averaged magnetic energy densities for B_x, B_y, and B_z. Right axis, solid lines: box-averaged toroidal field component ⟨B_y⟩ for simulations sg-mhd-1(black) and sg-mhd-2(red). Simulation sg-mhd-2 is discussed in the last paragraph of this section. Second image: turbulent stresses normalised by pressure sorted for α_r (Reynolds), α_g (gravity), and α_m (Maxwell). The stresses (α_r, α_g) are smoothed using a Gaussian convolute (standard deviation ).