Strictly stable high order difference approximations for computational aeroacoustics

High order finite difference approximations with improved accuracy and stability properties have been developed for computational aeroacoustics (CAA). One of our new difference operators corresponds to Tam and Webb's DRP scheme in the interior, but is modified near the boundaries to be strictly stable. A unified formulation of the nonlinear and linearized Euler equations is used, which can be extended to the Navier-Stokes equations. The approach has been verified for 1D, 2D and axisymmetric test problems. We have simulated the sound propagation from a rocket launch before lift-off. To cite this article: B. Miller, S. Johansson, C. R. Mecanique 333 (2005). (c) 2005 Academie des sciences. Published by Elsevier SAS. All rights reserved.