Identifications of sources of sound in low Mach number flows by the use of flow field eigenmodes
2006 (English)In: 13th International Congress on Sound and Vibration 2006, 2006, 2967-2974 p.Conference paper (Refereed)
We present a method to study sound generation processes in low Mach Number flows. Instead of the full flow field obtained from e.g a DNS, we consider a base flow together with a time-dependent perturbation ,where the perturbation satisfy the Navier-Stokes equations linearized around the base-flow. In a reduced model the perturbation is approximated by a linear combination of the cigenmodes of a corresponding eigenvalue problem. The behavior in time is determined by the corresponding eigenvalues. Curie's equation is used to calculate the acoustic field. By studying the source terms in Curie's equation, it is possible to identify mechanisms for sources of sound. This makes it possible to study how the different sources of sound depend on different structures of the flow field. We apply the methodology on a two- dimensional flow over a cavity with smoothed corners. Results of acoustic pressure in the far field and source strengths for different superpositions of eigenmodes are presented.
Place, publisher, year, edition, pages
2006. 2967-2974 p.
Fluid Mechanics and Acoustics
IdentifiersURN: urn:nbn:se:kth:diva-87914ScopusID: 2-s2.0-84883411932ISBN: 978-162748150-2OAI: oai:DiVA.org:kth-87914DiVA: diva2:502030
The Thirteenth International Congress on Sound and Vibration (ICSV 13), Vienna, Austria
QC 201202292012-02-142012-02-142014-11-05Bibliographically approved