Smoothed particle hydrodynamics for astrophysical simulations

  • Date:
  • Time: 14:00 - 15:30
  • Address:
    Sokolovská 83, Praha
  • Room: K3
  • Speaker: Pavel Ševeček

The seminar will cover an introduction to the smoothed particle hydrodynamics, a Lagrangian method for computational fluid dynamics. The method does not require a predetermined computational domain and it is thus useful for astrophysical applications. Using the Lagrangian of the particle system, it is possible to derive a set of equations that conserves the total mass, linear and angular momentum, and energy. However, the discretized equations appear unstable or inaccurate in some physically relevant situations (shockwave propagation, material interface, solid body rotation, etc.), which can be mitigated by modifying the discretization or by including artificial terms. SPH allows us to implement additional physics in a straightforward way. For astrophysical simulations, the equations can be extended by self-gravitation, heat diffusion or radiative transfer. In particular, SPH is the method of choice for collision simulations of self-gravitating bodies, allowing to compute collisions with various equations of state and rheological models.