Top panel: the thermal energy evolution of the wind-blown bubble driven by the feedback of a single massive star. The different curves present our results and those from a FLASH simulation performed with a refinement level 12 (see the legend). Middle panel: the star’s mechanical power injection rate as a function of time as given by the BoOST stellar tracks Szécsi et al. (2022), and the cooling rate calculated by our approach. Bottom panel: a comparison between ours and the FLASH results for the power-law index of the thermal energy evolution ξ = d log E_th/d log t. See the text for a discussion.