Monte Carlo simulation of the propagation of a disturbance in the channel flow of a rarefied gas (Q1130365)

We present some details of three-dimensional calculations for the title problem and investigate the effect of perturbation of simple shape for a short time at certain points. We have check that the DSMC method can reproduce accurately the propagation of perturbations in a complicated pre-existing flow pattern, and we are able to observe several phenomena typical of the transition to turbulence in gas flows, such as the appearance of vortices, phenomena similar to a bursting process when the perturbation interacts with a wall, and complicated mixing of different parts of the perturbation.