Acoustic liners are an effective tool for noise reduction and are characterized by a frequency-dependent impedance value. In this paper, a time-domain boundary element method for acoustic scattering coupled with a broadband impedance boundary condition is studied for the case of no mean flow. A Burton-Miller reformulation of the time domain boundary element method for acoustic scattering is carried out with both the pressure and its surface normal derivative terms retained. A multipole impedance model is converted into the time domain and used for enforcing an impedance boundary condition over a wide range of frequencies. Discretization of the coupled system is described. In particular, the time-domain impedance boundary condition is discretized by the third-order implicit backward difference scheme. Stability of the coupling is assessed by an eigenvalue analysis. Scattering solutions that demonstrate the validity and stability of the numerical method are presented.


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    Titel :

    Time-Domain Boundary Element Method with Broadband Impedance Boundary Condition


    Beteiligte:
    Rodio, Michelle E. (Autor:in) / Hu, Fang Q. (Autor:in) / Nark, Douglas M. (Autor:in)

    Erschienen in:

    AIAA Journal ; 60 , 6 ; 3661-3670


    Erscheinungsdatum :

    01.06.2022




    Medientyp :

    Aufsatz (Konferenz) , Aufsatz (Zeitschrift)


    Format :

    Elektronische Ressource


    Sprache :

    Englisch