23/03/2023 – F. Sharipov – Direct simulation Monte Carlo method and its applications to rarefied gas flows
Séminaire IUSTI – 23 mars 2023 – 14h salle 250
Direct simulation Monte Carlo method and its applications to rarefied gas flows
Felix Sharipov – Federal Univ. of Paraná, Curitiba, Brésil
The Navier-Stokes equation is applied to calculate gas flows in the hydrodynamic regime when the intermolecular collisions predominate the gas-surface interaction. In the free molecular regime, the intermolecular collisions are neglected and the motion of every molecule can be considered independently on each other. In the transition regime, the molecular mean free path is comparable to a characteristic size of flow so that the Navier-Stokes equation is not valid anymore, while the intermolecular collisions are not negligible. In this regime, the kinetic Boltzmann equation is solved or the Direct Simulation Monte Carlo (DSMC) method is applied. In the presentation, a review of recent results on rarefied gas dynamics based on the DSMC method will be given with examples of their applications to practical problems in vacuum technology, in micro-systems, in aerothermodynamics, etc. More specifically, an importance of intermolecular potential and its influence on flow characteristics will be shown. Some information about the peculiarities of gaseous mixture flows will be also given.