Characteristic profiles of gas expulsion processes inside the star cluster (from left to right, top to bottom). Calculated concentration profiles of the cluster stellar n_★ and gaseous n_ɡas material for the two cases: SFE = 0.15 with n_cload = 100 cm⁻³ and SFE = 0.35 with n_cload = 10 cm⁻³. The supernova explosion energy rate inside the cluster as a function of time is shown. The shockwave velocity and the shockwave travel time from the centre of the cluster as a function of the front radius. The dotted and dashed-dotted black vertical lines represent the radii within which 50% and 90% of the cluster stellar mass are enclosed, respectively. The dashed black vertical line represents the simulated cluster boundary, r_cluster, which we assume to be equal to 20 a_p (for the example model, it is ~19.5 pc).