ALARIC: An algorithm for constructing arbitrarily complex initial density distributions with low particle noise for SPH/SPMHD applications Articles uri icon

publication date

  • March 2018

start page

  • 186

end page

  • 197

volume

  • 224

International Standard Serial Number (ISSN)

  • 0010-4655

abstract

  • A method is presented to obtain initial conditions for Smoothed Particle Hydrodynamic (SPH) scenarios where arbitrarily complex density distributions and low particle noise are needed. Our method, named ALARIC, tampers with the evolution of the internal variables to obtain a fast and efficient profile evolution towards the desired goal. The result has very low levels of particle noise and constitutes a perfect candidate to study the equilibrium and stability properties of SPHISPMHD systems. The method uses the iso-thermal SPH equations to calculate hydrodynamical forces under the presence of an external fictitious potential and evolves them in time with a 2nd-order symplectic integrator. The proposed method generates tailored initial conditions that perforrri better in many cases than those based on purely crystalline lattices, since it prevents the appearance of anisotropies. (C) 2017 Elsevier B.V. All rights reserved.

keywords

  • smoothed particle hydrodynamics; sph; smoothed particle magneto-hydrodynamics; spmhd; initial conditions; low noise