Exhaust duct flow noise simulation: A case study

Jukka Tanttari, Antti Lehtinen, Esa Nousiainen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsProfessional


    Exhaust noise is an important component in piston engine power plant environmental noise. It originates from engine as well as from turbulent gas flow in exhaust duct. Flow-related part has been less important but has caught more attention recently. A case study concerning noise of a part of a real exhaust duct was conducted. Simulations were done in several phases with increasing level of model capability and complexity. Steady state CFD provided information of the noise generation regions and levels. Transient CFD, resolving the turbulent structures, was then used to obtain more realistic information of the levels and frequency content. Finally, results from transient CFD were used as a FSP excitation for structural FE-model of the duct connected to exterior sound field. In-duct pressures estimated by transient CFD were in a very good agreement with experimental data from 50 to 500 Hz. It was also noticed that FSP excitation sets very strict demands on structural models because of potential spatial aliasing due to high wave-numbers involved. Correct description of both temporal as well as spatial characteristics of the excitation is essential for valid vibro-acoustic model.
    Original languageEnglish
    Title of host publicationProceedings of BNAM 2014
    PublisherEuropean Acoustics Association (EAA)
    ISBN (Print)978-87-995400-1-3
    Publication statusPublished - 2014
    MoE publication typeD3 Professional conference proceedings
    EventBaltic-Nordic Acoustic Meeting, BNAM 2014 - Tallinn, Estonia
    Duration: 2 Jun 20144 Jun 2014


    ConferenceBaltic-Nordic Acoustic Meeting, BNAM 2014
    Abbreviated titleBNAM 2014


    • aero-vibro-acoustics
    • duct acoustics
    • computational fluid dynamics


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