Numerical Acoustic Models Including Viscous and Thermal losses: Review of Existing and New Methods

Publication: Research - peer-reviewArticle in proceedings – Annual report year: 2017

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This work presents an updated overview of numerical methods including acoustic viscous and thermal losses. Numerical modelling of viscothermal losses has gradually
become more important due to the general trend of making acoustic devices smaller. Not including viscothermal acoustic losses in such numerical computations
will therefore lead to inaccurate or even wrong results. Both, Finite Element Method (FEM) and Boundary Element Method (BEM), formulations are available that
incorporate these loss mechanisms. Including viscothermal losses in FEM computations can be computationally very demanding, due to the meshing of very thin boundary layers and the added degrees of freedom[3]. These implications can be avoided using the BEM with losses, but other shortcomings affect this formulation as well.
Through a simple academic test case, well established acoustic implementations and a newly proposed coupled FEM and BEM method including viscothermal dissipation
are compared and investigated.
Original languageEnglish
Title of host publicationProceedings of DAGA 2017
Number of pages4
PublisherDeutsche Gesellschaft für Akustik e.V.
Publication date2017
StatePublished - 2017
Event43. Jahrestagung für Akustik - Kiel, Germany

Conference

Conference43. Jahrestagung für Akustik
LocationChristian-Albrechts-Universität zu Kiel
CountryGermany
CityKiel
Period06/03/201709/03/2017
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