How to inflate a wind-blown bubble
  Stellar winds are one of several ways that massive stars can affect the star
formation process on local and galactic scales. In this paper we investigate
the numerical resolution needed to inflate an energy-driven stellar wind bubble
in an external medium. We find that the radius of the wind injection region,
$r_{\rm inj}$, must be below a maximum value, $r_{\rm inj,max}$, in order for a
bubble to be produced, but must be significantly below this value if the bubble
properties are to closely agree with analytical predictions. The final bubble
momentum is within 25 per cent of the value from a higher resolution reference
model if $\chi = r_{\rm inj}/r_{\rm inj,max}$ = 0.1. Our work has significance
for the amount of radial momentum that a wind-blown bubble can impart to the
ambient medium in simulations, and thus on the relative importance of stellar
wind feedback.
