Section: New Results

Numerical methods for high altitude aerodynamics

Participants : Luc Mieussens [Corresponding member] , N. Hérouard [CEA-CESTA, PhD] .

In collaboration with CEA-CESTA, we have worked on the following subjects.

• A new method to generate locally refined velocity grids has been proposed. Very high performance improvement have been obtained (acceleration of the CPU time by a ratio around 30 for 3D computations). This work has been published in the proceedings of the 28th Symposium on rarefied Gas Dynamics, and is the subject of a paper submitted for publication.

• The second order Discontinuous Galerkin method has been studied for a one-dimensional problem of rarefied gases: we have shown that this method is clearly more accurate and faster than our finite volume method (which was used up to fourth order). This study will be developed in 2013 (numerical analysis and application to 2D problems).