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.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Time-Domain Boundary Element Method with Broadband Impedance Boundary Condition


    Contributors:

    Published in:

    AIAA Journal ; 60 , 6 ; 3661-3670


    Publication date :

    2022-06-01




    Type of media :

    Conference paper , Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English




    Improved Multipole Broadband Time-Domain Impedance Boundary Condition

    Li, X. Y. / Li, X. D. / Tam, Christopher K. W. | AIAA | 2012




    Construction and Validation of a Broadband Time Domain Impedance Boundary Condition

    Li, Xiaoyan / Li, Xiaodong / Tam, Christopher | AIAA | 2011


    Further Insights on Time-Domain Impedance Boundary Condition

    Escouflaire, Marie / Redonnet, Stephane / Auregan, Yves | AIAA | 2013