The system will be going down for regular maintenance. Please save your work and logout.
Locally refined discrete velocity grids for stationary rarefied flow simulations
Language
en
Article de revue
This item was published in
Journal of Computational Physics. 2014, vol. 257, n° 15, p. 572-593
Elsevier
English Abstract
Most of deterministic solvers for rarefied gas dynamics use discrete velocity (or discrete ordinate) approximations of the distribution function on a Cartesian grid. This grid must be sufficiently large and fine to describe ...Read more >
Most of deterministic solvers for rarefied gas dynamics use discrete velocity (or discrete ordinate) approximations of the distribution function on a Cartesian grid. This grid must be sufficiently large and fine to describe the distribution functions at every space position in the computational domain. For 3-dimensional hypersonic flows, like in re-entry problems, this induces much too dense velocity grids that cannot be practically used, for memory storage requirements. In this article, we present an approach to generate automatically a locally refined velocity grid adapted to a given simulation. This grid contains much less points than a standard Cartesian grid and allows us to make realistic 3-dimensional simulations at a reduced cost, with a comparable accuracy.Read less <
English Keywords
rarefied flow simulation
hypersonic flows
re-entry problem
transition regime
BGK model
discrete velocity model
Origin
Hal imported