For the unsteady simulation of compressible subsonic flows (Large Eddy Simulation or
Direct Numerical Simulation), the proper handling of the inlet boundary is a challenging
task. Indeed, inflow generation through imposition of the velocity may lead to a
non-physical reflection of the upstream acoustic waves. In the present contribution, a
method that allows both filtering of these waves and proper imposition of the required
variables is proposed. This method is based on identification of the roles of the temporal
rate of change of wave amplitudes at the inlet in the low Mach number regime. The
formulation obtained is tested numerically on unsteady one-dimensional flows at low Mach
number for which the unsteady inlet velocity signal is purely harmonic or harmonic with
the superimposition of synthetic turbulence.