Run A0.5M0.1 (α = 0.5, ℳ = 0.1) at five time steps (3 before and 2 after the sink formation). Full lines: 3D simulations. Dashed lines: 1D simulations. The time steps were adjusted using the value of the central density or the mass of the sink particle. The agreement is generally quite good for the density and radial velocity (except in the cloud’s inner part after sink formation). Before the sink formation, the agreement with the transverse velocity component is also good, though less tight than it is for n and V_r. After the sink formation, we observe major deviations for v_t and v_r. For the radial velocity fluctuation, v_r, the agreement remains comparable to v_t except at late time in the cloud inner part and generally outside the cloud (r >  0.1 pc.)