Rarefied Gas Dynamics

Micro/Nanoscale Flow Simulation Using DSMC

 

DSMC (Direct Simulation Monte Carlo) method is a numerical tool to solve the Boltzmann equation based on direct statistical simulation of the molecular processes described by the kinetic theory. It is considered as a particle method in which particle represents a large bulk of real gas molecules. The primary principle of DSMC is to decouple the motion and collision of particles during one time step. The implementation of DSMC needs breaking down the computational domain into a collection of grid cells. The cells are divided into sub-cells in each direction. Sub-cells are then utilized to facilitate the selection of collision pairs. After fulfilling all molecular movements, the collisions between molecules are simulated in each cell separately.

We have used the DSMC method in the following topics.

subsonic

Micro/Nano Channel

nozzle

Nozzle









 








cylinder

Micro-Cylinder Flow

cavity

Micro/Nano Cavity

parallel

Parallel Processing

step

Backward Facing Step



















cooling

DSMC Cooling

dsmc foam

dsmcFoam


More details on the DSMC method could be find in:

1. Bird GA. Molecular Gas Dynamics and the Direct Simulation of Gas Flows. Clarendon Press, Oxford, United Kingdom, (1994).

2. Liou WW and Fang Y. Microfluidic Mechanics: Principles and Modeling. McGraw-Hill, (2006).