An Axisymmetrical Acoustic BEM Formulation Including Visco-Thermal Losses

Vicente Cutanda Henriquez, Peter Møller Juhl

Publikation: Kapitel i bog/rapport/konference-proceedingKonferencebidrag i proceedingsForskning


Sound waves in air experience losses due to viscous friction and thermal exchange, which become particularly relevant in a thin boundary layer over the domain boundaries. The lossless wave equation can still be used when the thickness of the boundary layer is small as compared with the setup dimensions. However, this is not usually true for small devices such as microphones, hearing aids, couplers, MEMS devices, mobile phones, etc., and then the losses need to be modeled. In this paper a numerical implementation of the Boundary Element Method (BEM) which includes visco-thermal losses is presented. The formulation is based on the Kirchoff method, where acoustic, thermal and viscous effects are decoupled everywhere except at the boundaries. This BEM formulation does not impose geometrical restrictions to the setup and can be applied to any axisymmetrical object, as long as the division of the boundary into elements is adequate and the problem has a manageable size. The method can be extended to full three-dimensional BEM.
TitelProceedings of Forum Acusticum 2011
Antal sider6
ForlagEuropean Acoustics Association
Publikationsdatojun. 2011
ISBN (Elektronisk)978-84-694-1520-7
StatusUdgivet - jun. 2011
BegivenhedForum Acusticum 2011 - Aalborg, Danmark
Varighed: 27. jun. 20111. jul. 2011


KonferenceForum Acusticum 2011
NavnForum Acusticum


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  • Baltic-Nordic Acoustics Meeting 2012

    Peter Møller Juhl (Arrangør)

    18. jun. 201220. jun. 2012

    Aktivitet: Deltagelse i faglig begivenhedOrganisering af eller deltagelse i konference

  • Forum Acusticum 2011

    Vicente Cutanda Henriquez (Andet)

    27. jun. 20111. jul. 2011

    Aktivitet: Foredrag og mundtlige bidragForedrag og præsentationer i privat eller offentlig virksomhed