Turbulent components v_r and v_t for run A0.1M0.1 (α = 0.1, ℳ = 0.1). The 1D simulations were performed with Eqs. (14) and (15); that is to say, without the contribution of the Jeans instability (Eqs. (18) and (19)). The transverse component v_t is significantly larger in the 3D calculations than in the 1D ones, implying that another source of turbulence must be accounted for in the 1D simulations.