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

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Authors

  • Mohamed TAKTAK Unite de Mecanique, Modelisation et Productique (U2MP) Departement de Genie Mecanique, Ecole Nationale d’Ingenieurs de Sfax, Universite de Sfax
  • Mohamed Ali MAJDOUB Unite de Mecanique, Modelisation et Productique (U2MP) Departement de Genie Mecanique, Ecole Nationale d’Ingenieurs de Sfax, Universite de Sfax
  • Mabrouk BENTAHAR (Laboratoire Roberval UMR UTC-CNRS n◦6253.Universite de Technologie de Compiegne
  • Mohamed HADDAR Unite de Mecanique, Modelisation et Productique (U2MP) Departement de Genie Mecanique, Ecole Nationale d’Ingenieurs de Sfax, Universite de Sfax

Abstract

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.

Keywords:

lined duct, mean flow, finite element method, axisymmetric duct