uniGasFoam: A particle-based OpenFOAM solver for multiscale rarefied gas flows

[NVasileiadis93]

Hi everyone,

First, I would like to say that this collection of rarefied gas dynamics repositories is extremely valuable for the community.

I would like to start a discussion about potentially including uniGasFoam a particle-based solver for multiscale rarefied gas flow simulations, in this repository of rarefied gas dynamics codes.

uniGasFoam is an open-source solver developed within the OpenFOAM framework as an extension of dsmcFoam+. The solver aims to address coupling challenges in hybrid continuum–particle simulations by coupling DSMC with stochastic particle BGK methods.

Key features

• Unified particle framework for DSMC, SP, and USP methods
• Hybrid USP–DSMC capability for multiscale rarefied gas flows
• Fully particle-based coupling, avoiding traditional FV–particle hybrid coupling complexity

Advanced adaptive algorithms:

• transient adaptive sub-cells
• non-uniform cell weighting
• adaptive global time stepping

[knstmrd]

Thanks for the suggestion, I've added a link to the solver!