Modelling Acoustic Wave Propagation in Axisymmetric Varying-Radius Waveguides

David Bæk, Morten Willatzen

    Research output: Contribution to journalJournal articleResearchpeer-review


    A computationally fast and accurate model (a set of coupled ordinary differential equations) for fluid sound-wave propagation in infinite axisymmetric waveguides of varying radius is proposed. The model accounts for fluid heat conduction and fluid irrotational viscosity. The model problem is solved by expanding solutions in terms of cross-sectional eigenfunctions following Stevenson’s method. A transfer matrix can be easily constructed from simple model responses of a given waveguide and later used in computing the response to any complex wave input. Energy losses due to heat conduction and viscous effects are also assessed.
    Original languageEnglish
    JournalActa Acustica united with Acustica
    Issue number5
    Pages (from-to)668-675
    Publication statusPublished - 2008


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