3D Rarefied Gas dynamics Simulation software

RGS3D

RGS3D is a DSMC simulation software to compute spatial distribution of density, temperature and pressure of neutral gas in two or three dimensional arbitrary geometry shape under from viscous flow to free molecule flow by new collision method.

Description

RGS3D is based on DSMC(Direct Simulation Monte Carlo) method which is a probabilistic method to solve Boltzmann equation in gas theory. RGS3D is a simulation software to compute the flow field of rarefied gas in various vacuum chambers. This module is applied to from viscous flow field to free molecule flow field by using the new collision method(U-system)[1][2]. The new collision method has been implemented to RGS3D. There are no restriction of mesh width depending on mean free path length by using this method. Weight algorithm is adopted to avoid statistical fluctuation in the case that the difference of densities between species would be very large. [1] Usami, M. and Nakayama T., Intermolecular Collision Scheme of DSMC Taking Molecular Locations within a Cell into Account, Rarefied Gas Dynamics, AIP Conference Proceedings, Vol.663 (2003), pp.374-381. [2] Usami, M. and Mizuguchi, K., DSMC Calculation of Vortex Shedding behind a Flat Plate with a New Intermolecular Collision Scheme, Rarefied Gas Dynamics, AIP Conference Proceedings, Vol.762 (2005), pp.686-691.

Input data

  • Mesh data,grids and elements data, of Nastran fromat for two or three dimensional arbitrary mesh.
  • Specify mass number and diameter of each gas species.
  • Specify various boundary conditions for in/outflow boundaries and reflective wall.
  • Specify chemical reactions in gas phase or on walls.

Output data