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Characteristics of large volume tomographic particle image velocimetry using helium filled soap bubbles in forced and thermal convection

Kühn, Matthias und Ehrenfried, Klaus und Bosbach, Johannes und Wagner, Claus (2010) Characteristics of large volume tomographic particle image velocimetry using helium filled soap bubbles in forced and thermal convection. 15th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 05.-08. Juli 2010, Lissabon, Portugal.

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Offizielle URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2010/

Kurzfassung

The characteristics of large-scale tomographic PIV in thick measurement volumes (MVs), which are necessary for measuring large-scale structures in convective air flows, are discussed. In thick MVs the number of illuminated particles outside the reconstructed volume increases under different circumstances. The complete intensity of these particles needs to be back projected in the volume during the reconstruction process. By conducting numerical simulations the influence of the back projected intensity of these particles on the measurement accuracy is investigated. Further, in order to make possible processing of large amounts of data a parallel implementation of the tomographic PIV algorithms was developed. In this course an implementation of the simultaneous multiplicative reconstruction algorithm as recently proposed by Atkinson and Soria (Exp Fluids 47:553-568, 2009) for tomographic PIV is discussed and validated for large-scale tomographic PIV. A strategy of processing these routines on high performance computer clusters is also reviewed. Large-scale tomographic Particle Image Velocimetry (tomographic PIV) using Helium filled soap bubbles as tracer particles has been applied to convective air flow in a long rectangular convection cell. The mean flow fields in forced and mixed convection of air in a convection cell for a Reynolds number of 345, 530 and 800 and for the same Re at a Rayleigh number Ra = 1.65*10^8, respectively are analyzed.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Characteristics of large volume tomographic particle image velocimetry using helium filled soap bubbles in forced and thermal convection
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Kühn, Matthiasmatthias.kuehn@dlr.de
Ehrenfried, Klausklaus.ehrenfried@dlr.de
Bosbach, Johannesjohannes.bosbach@dlr.de
Wagner, Clausclaus.wagner@dlr.de
Datum:5 Juli 2010
Referierte Publikation:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
Seitenbereich:Seiten 1-14
Name der Reihe:Coference Proceedings on USB-Stick
Status:veröffentlicht
Stichwörter:Large-scale tomographic PIV; Large volume tomographic PIV; Helium filled soap bubbles; Validation; Ghost particles; MART; SMART; Parallelization; Forced convection; Mixed convection
Veranstaltungstitel:15th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Veranstaltungsort:Lissabon, Portugal
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:05.-08. Juli 2010
HGF - Forschungsbereich:Verkehr und Weltraum (alt)
HGF - Programm:Luftfahrt
HGF - Programmthema:Starrflügler
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L AR - Starrflüglerforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Flugphysik
Standort: Göttingen
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Fluidsysteme
Hinterlegt von: Matthias Kühn
Hinterlegt am:21 Jul 2010 14:15
Letzte Änderung:21 Jul 2010 14:15

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