Numerical Modelling of the Acoustic Pressure Inside an Axisymmetric Lined Flow Duct

Numerical methods are mostly used to predict the acoustic pressure inside duct systems. In this
paper, the development of a numerical method based on the convected Helmholtz equation to compute
the acoustic pressure inside an axisymmetric duct is presented. A validation of the proposed method was
done by a comparison with the analytical formulation for simple cases of hard wall and lined ducts. The
effect of the flow on the acoustic pressure inside these ducts was then evaluated by computing this field
with different Mach numbers.