Conference paper
Numerical Acoustic Models Including Viscous and Thermal losses: Review of Existing and New Methods
Department of Electrical Engineering, Technical University of Denmark1
Acoustic Technology, Department of Electrical Engineering, Technical University of Denmark2
Department of Mechanical Engineering, Technical University of Denmark3
Solid Mechanics, Department of Mechanical Engineering, Technical University of Denmark4
Technical University of Munich5
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.
| Language: | English |
|---|---|
| Publisher: | Deutsche Gesellschaft für Akustik e.V. |
| Year: | 2017 |
| Proceedings: | 43. Jahrestagung für Akustik |
| Types: | Conference paper |
| ORCIDs: | Andersen, Peter Risby , Cutanda Henriquez, Vicente and Aage, Niels |
