@article{5980,
  author = {R. Keppens and J. P. Goedbloed},
  title = {Numerical simulations of stellar winds: polytropic models},
  abstract = {We discuss steady-state transonic outflows obtained by direct numerical solution of the hydrodynamic and magnetohydrodynamic equations. We make use of the Versatile Advection Code, a software package for solving systems of (hyperbolic) partial differential equations. We proceed stepwise from a spherically symmetric, isothermal, unmagnetized, non-rotating Parker wind to arrive at axisymmetric, polytropic, magnetized, rotating models. These represent 2D generalisations of the analytical ID Weber-Davis wind solution, which we obtain in the process. Axisymmetric wind solutions containing both a 'wind' and a 'dead' zone are presented. Since we are solving for steady-state solutions, we efficiently exploit fully implicit time stepping. The method allows us to model thermally and/or magneto-centrifugally driven stellar outflows. We particularly emphasize the boundary conditions imposed at the stellar surface. For these axisymmetric, steady-state solutions, we can use the knowledge of the flux functions to verify the physical correctness of the numerical solutions.},
  year = {1999},
  journal = {Astronomy & Astrophysics},
  volume = {343},
  number = {1},
  pages = {251-260},
  month = {Mar},
  isbn = {0004-6361},
  language = {eng},
}