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Handling of spatially truncated source fields based on pressure time derivatives in hybrid computational aeroacoustics
Publikationstyp
Journal Article
Date Issued
2017-11-01
Sprache
English
Author(s)
Institut
TORE-URI
Volume
16
Issue
7-8
Start Page
563
End Page
581
Citation
International Journal of Aeroacoustics 7-8 (16): 563-581 (2017-11-01)
Publisher DOI
Scopus ID
In hybrid computational aeroacoustics, the acoustic computation domain is oftentimes larger than the domain of the flow simulation. Consequently, discontinuities of the source field occur on the acoustic mesh, which can diminish the quality of the results. A common way to handle truncated source fields is spatial windowing. The present work focuses on aeroacoustic approaches that use time derivatives of the incompressible base flow pressure as acoustic source terms and their distinctive character with respect to source domain truncation. Especially for those approaches, a novel alternative to spatial windowing is proposed, which uses a simplified pressure field continuation beyond the source domain. Numerical results display that spatial windowing and simplified pressure field continuation can both treat truncated source fields effectively. The windowing approach is computationally cheaper but exhibits issues for small flow computation domains. The simplified pressure field continuation can overcome these and other issues yielding very good results while adding little computational cost.
Subjects
Computational aeroacoustics
hydrodynamic/acoustic splitting
source domain truncation
time derivative source terms