Hydrostatic Simulation of Earth's Atmospheric Gas Using Multi-particle Collision Dynamics

TL;DR

This paper uses multi-particle collision dynamics to simulate Earth's atmospheric gas, demonstrating that particle behavior aligns with kinetic and hydrostatic theories under ideal conditions.

Contribution

It introduces a novel application of MPCD to model hydrostatic behavior of atmospheric gases in a 2D simulation environment.

Findings

Particle behavior follows kinetic theory for ideal gases.

Density distribution matches hydrostatic atmospheric theory.

Simulation confirms gravitational effects on gas particles.

Abstract

Multi-particle collision dynamics (MPCD) is a mesoscopic simulation method to simulate fluid particle-like flows. MPCD has been widely used to simulate various problems in condensed matter. In this study, hydrostatic behavior of gas in the Earth's atmospheric layer is simulated by using MPCD method. The simulation is carried out by assuming the system under ideal state and is affected only by gravitational force. Gas particles are homogeneous and placed in 2D box. Interaction of the particles with the box is applied through implementation of boundary conditions (BC). Periodic BC is applied on the left and the right side, specular reflection on the top side, while bounce-back on the bottom side. Simulation program is executed in Arch Linux and running in notebook with processor Intel i5 @2700 MHz with 10 GB DDR3 RAM. The results show behaviors of the particles obey kinetic theory for ideal gas when gravitational acceleration value is proportional to the particle mass. Density distribution as a function of altitude also meets atmosphere's hydrostatic theory.