Comparison between particle and fluid approximations to dust dynamics

TL;DR

This paper introduces a new particle-based dust module in the MHD Piernik code, comparing particle and fluid approaches to dust dynamics under astrophysical conditions.

Contribution

It extends the Piernik MHD code with a particle approximation for dust and compares its results with fluid simulations.

Findings

Particle and fluid approximations show key differences in dust dynamics.

The particle module provides a new way to simulate dust behavior in astrophysics.

Comparison highlights the strengths and limitations of each approach.

Abstract

We present a new particle module of the magnetohydrodynamic (MHD) Piernik code. The original multi-fluid grid code based on the Relaxing Total Variation Diminishing (RTVD) scheme 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. In this poster we introduce the scheme used to solve equations of motion for the particles and present the first results coming from the module. The results of test problems are also compared with the results coming from fluid simulations made with Piernik-MHD code. The comparison shows the most important differences between fluid and particle approximations used to describe dynamical evolution of dust under astrophysical conditions.