Direct Monte-Carlo simulations in a gas centrifuge

The study is related to the centrifugation process for isotope separation. In a gas centrifuge, the major part of the rotating gas is modeled by fluid equations with this gas flow described by suitable Navier-Stokes. Nevertheless, a kinetic description of the gas is necessary for the feed gas expansion from the central pipe, and for the residual gas contained in the casing in which the cylinder rotates. For these rarefied regimes, we use Direct Monte-Carlo Simulations. In the first case, the simulations provide more realistic boundary conditions for fluid flow calculations. In the second case, we use DSMC to determine the mechanical power of the rotating cylinder and the heat flux dissipated on this cylinder and the fixed cylinder of the casing.