Three-dimensional SPH simulations of accretion discs
  We discuss some 3D numerical simulations of accretion discs using the SPH method and a polytropic equation of state. We show that discs exist even for as large value of the polytropic index as 1.2, and that these discs are always in hydrostatic balance. We also show that even without any inflow, spiral shocks appear in the discs. 
Henri M.J. Boffin, Kei Haraguchi and Takuya Matsuda