Large-eddy simulations of isolated disc galaxies with thermal and
  turbulent feedback
  We present a subgrid-scale model for the Multi-phase Interstellar medium,
Star formation, and Turbulence (MIST) and explore its behaviour in
high-resolution large-eddy simulations of isolated disc galaxies. MIST follows
the evolution of a clumpy cold and a diffuse warm component of the gas within a
volume element which exchange mass and energy via various cooling, heating and
mixing processes. The star formation rate is dynamically computed from the
state of the gas in the cold phase. An important feature of MIST is the
treatment of unresolved turbulence in the two phases and its interaction with
star formation and feedback by supernovae. This makes MIST a particularly
suitable model for the interstellar medium in galaxy simulations. We carried
out a suite of simulations varying fundamental parameters of our feedback
implementation. Several observational properties of galactic star formation are
reproduced in our simulations, such as an average star formation efficiency
~1%, a typical velocity dispersion around ~10 km/s in star-forming regions, and
an almost linear relationship between the column densities of star formation
and dense molecular gas.
