Numerical Analysis of Time-Dependent Galbrun Equation in an Infinite   Duct
  In this paper we are interested in the mathematical and numerical analysis of the time-dependent Galbrun equa- tion in a rigid duct. This equation models the acoustic propagation in presence of flow [1]. We propose a regu- larized variational formulation of the problem, in the sub- sonic case, suitable for an approximation by Lagrange finite elements, and corresponding absorbing boundary conditions. 
Kamel Berriri (INRIA Rocquencourt), A.-S. Bonnet-Ben Dhia (INRIA   Rocquencourt), P. Joly (INRIA Rocquencourt)