Particle module of Piernik MHD code

TL;DR

This paper extends the Piernik MHD code by incorporating a particle-based dust model, enabling comparison between particle and fluid approaches in astrophysical dust dynamics.

Contribution

The paper introduces a particle module for the Piernik MHD code, allowing dust to be modeled as interacting particles within a multi-fluid framework.

Findings

Particle and fluid simulation results show notable differences in dust dynamics.

The particle approach provides a more detailed description of dust behavior.

Comparison highlights the importance of modeling choices in astrophysical dust studies.

Abstract

Piernik is a multi-fluid grid magnetohydrodynamic (MHD) code based on the Relaxing Total Variation Diminishing (RTVD) conservative scheme. The original code has been extended by addition of dust described within the particle approximation. The dust is now described as a system of interacting particles. The particles can interact with gas, which is described as a fluid. The comparison between the test problem results and the results coming from fluid simulations made with Piernik code shows the most important differences between fluid and particle approximations used to describe dynamical evolution of dust under astrophysical conditions.