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RPM - the fast Random Particle-Mesh method to realize unsteady turbulent sound sources and velocity fields for CAA applications.

Ewert, Roland (2007) RPM - the fast Random Particle-Mesh method to realize unsteady turbulent sound sources and velocity fields for CAA applications. In: AIAA Pap. 2007-3506. 13th AIAA/CEAS Aeroacoustics Conference, 2007-05-21 - 2007-05-23, Rome, Italy.

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Kurzfassung

The simulation of broadband noise with CAA techniques is discussed. Unsteady broadband sound sources are modeled in the time-domain with a highly efficient computational method. The generated fluctuations reproduce very accurately autocorrelations and integral length-scales such as that provided by a RANS simulation of the time-averaged turbulent flow problem. It is argued that an approach based on synthetically generated sources has to be seen as an algorithmic extension of traditional statistical broadband methods in the frequency domain. Fluctuating quantities are generated by spatially filtering convective white-noise. The discrete realization of convective white-noise is based on random particles that are advanced using an area-weighted mean of the mean-flow from neighboring mesh points. The spatial filtering is realized by interpolating the random values with a particle shape function onto the neighboring mesh points and applying subsequently a sequence of 1D filtering operations. Sample results for different aeroacoustic applications of the method are presented.

Dokumentart:Konferenzbeitrag (Paper)
Titel:RPM - the fast Random Particle-Mesh method to realize unsteady turbulent sound sources and velocity fields for CAA applications.
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Ewert, RolandNICHT SPEZIFIZIERT
Datum:2007
Erschienen in:AIAA Pap. 2007-3506
Referierte Publikation:Nein
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:CAA, RPM, Tam & Auriault Jet Noise Theory
Veranstaltungstitel:13th AIAA/CEAS Aeroacoustics Conference
Veranstaltungsort:Rome, Italy
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:2007-05-21 - 2007-05-23
Veranstalter :AIAA/CEAS
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:L VU - Luftverkehr und Umwelt (alt)
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L VU - Luftverkehr und Umwelt
DLR - Teilgebiet (Projekt, Vorhaben):L - Leiser Luftverkehr (alt)
Standort: Braunschweig
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik
Hinterlegt von: Dr.-Ing. Roland Ewert
Hinterlegt am:17 Jan 2008
Letzte Änderung:12 Dez 2013 20:29

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