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Date:
04 May 2012
Largescale tomographic PIV in forced and mixed convection using a parallel SMART version
 Matthias Kühn,
 Klaus Ehrenfried,
 Johannes Bosbach,
 Claus Wagner
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Largescale tomographic particle image velocimetry (tomographic PIV) was used to study largescale flow structures of turbulent convective air flow in an elongated rectangular convection cell. Three flow cases have been investigated, that is, pure forced convection and mixed convection at two different Archimedes numbers. The Reynolds number was constant at Re = 1.04 × 10^{4} for all cases, while the Archimedes numbers were Ar = 2.1 and 3.6 for the mixed convection cases, corresponding to Rayleigh numbers of Ra = 1.6 × 10^{8} and 2.8 × 10^{8}, respectively. In these investigations, the size of the measurement volume was as large as 840 mm × 500 mm × 240 mm. To allow for statistical analysis of the measured instantaneous flow fields, a large number of samples needed to be evaluated. Therefore, an efficient parallel implementation of the tomographic PIV algorithm was developed, which is based on a version of the simultaneous multiplicative reconstruction technique (SMART). Our algorithm distinguishes itself amongst other features by the fact that it does not store any weighting coefficients. The measurement of forced convection reveals an almost twodimensional roll structure, which is orientated in the longitudinal cell direction. Its mean velocity field exhibits a core line with a wavy shape and a wavelength, which corresponds to the height and depth of the cell. In the instantaneous fields, the core line oscillates around its mean position. Under the influence of thermal buoyancy forces, the global structure of the flow field changes significantly. At lower Archimedes numbers, the resulting rolllike structure is shifted and deformed as compared to pure forced convection. Additionally, the core line oscillates much more strongly around its mean position due to the interaction of the roll structure with the rising hot air. If the Archimedes number is further increased, the rolllike structure breaks up into four counterrotating convection rolls as a result of the increased influence of buoyancy forces. Moreover, largescale tomographic PIV reveals that the orientation of these rolls reflects a ‘W’like shape in the horizontal X–Zplane of the convection cell.
References
Ahlers G, Grossmann S, Lohse D (2009) Heat transfer and large scale dynamics in turbulent RayleighBénard convection. Rev Mod Phys 81:503–537CrossRef
Andersen AH, Kak AC (1984) Simultaneous algebraic reconstruction technique (SART): a superior implementation of the ART algorithm. Ultrason Img 6:81–94CrossRef
Atkinson C, Soria J (2009) An efficient simultaneous reconstruction technique for tomographic particle image velocimetry. Exp Fluids 47:553–568CrossRef
Atkinson C, Coudert S, Foucaut JM, Stanislas M, Soria J (2011) The accuracy of tomographic particle image velocimetry for measurements of a turbulent boundary layer. Exp Fluids 50:1031–1056CrossRef
Bosbach J, Penneçot J, Wagner C, Raffel M, Lerche T, Repp S (2006) Experimental and numerical simulations of turbulent ventilation in aircraft cabins. Energy 31:694–705CrossRef
Bosbach J, Kühn M, Wagner C (2009) Large scale particle image velocimetry with helium filled soap bubbles. Exp Fluids 46:539–547CrossRef
Buchmann NA, Atkinson C, Jeremy MC, Soria J (2011) Tomographic particle image velocimetry investigation of the flow in a modelled human carotid artery bifurcation. Exp Fluids 50:1131–1151CrossRef
Chapman B, Jost G, van der Pas R (2007) Using OpenMP—portable shared memory parallel programming. The MIT Press, Cambridge
Discetti S, Astarita T (2012) A fast multiresolution approach to tomographic PIV. Exp Fluids 52:765–777CrossRef
Elsinga GE, Scarano F, Wieneke B, Oudheusden BW (2006) Tomographic particle image velocimetry. Exp Fluids 41:933–947CrossRef
Graftieaux L, Michard M, Grosjean N (2001) Combining PIV, POD and vortex identification algorithm for the study of unsteady turbulent swirling flows. Meas Sci Technol 12:1422–1429CrossRef
Gropp W, Lusk E, Skjellum A (1999) Using MPI—portable parallel programming with the messagepassing interface, 2nd edn. The MIT Press, Cambridge
Herman GT, Lent A (1976) Iterative reconstruction algorithms. Comp Biol Med 6:273–294CrossRef
Kühn M, Ehrenfried K, Bosbach J, Wagner C (2008) Feasibility study of tomographic particle image velocimetry for large scale convective air flow. In: 14th international symposium on applications of laser techniques to fluid mechanics, Lisbon, Portugal
Kühn M, Bosbach J, Wagner C (2009) Experimental parametric study of forced and mixed convection in a passenger aircraft cabin mockup. Build Environ 44:961–970CrossRef
Kühn M, Ehrenfried K, Bosbach J, Wagner C (2010) Characteristics of large volume tomographic particle image velocimetry using helium filled soap bubbles in forced and thermal convection. In: 15th International symposium on applications of laser techniques to fluid mechanics, Lisbon, Portugal
Kühn M, Ehrenfried K, Bosbach J, Wagner C (2011) Largescale tomographic particle image velocimetry using heliumfilled soap bubbles. Exp Fluids 50:929–948CrossRef
Mishra D, Muralidhar K, Munshi P (1999) A robust MART algorithm for tomographic applications. Numer Heat Transfer B 35:485–506CrossRef
Mueller K (1998) Fast and accurate threedimensional reconstruction from conebeam projection data using algebraic methods. PhD thesis, The Ohio State University, Columbus, OH, USA
Raffel M, Willert CE, Wereley ST, Kompenhans J (2007) Particle image velocimetry—a practical guide, 2nd edn. Springer, Berlin
Scarano F (2002) Iterative image deformation methods in PIV. Meas Sci Technol 13:R1–R19CrossRef
Scarano F, Poelma C (2009) Threedimensional vorticity patterns of cylinder wakes. Exp Fluids 47:69–83CrossRef
Schanz D, Gesemann S, Schröder A, Wienecke B, Michaelis D (2010) Tomographic reconstruction with nonuniform optical transfer functions (OTF) In: 15th international symposium on applications of laser techniques to fluid mechanics, Lisbon, Portugal
Schmeling D, Westhoff A, Kühn M, Bosbach J, Wagner C (2010) Flow structure formation of turbulent mixed convection in a closed rectangular cavity. In: Dillmann A, Heller G, Klaas M, Kreplin HP, Nitsche W, Schröder W (eds) New results in numerical and experimental fluid mechanics VII. Notes on numerical fluid mechanics and multidisciplinary design (NNFM), vol 112. Springer, Berlin, pp 571–578
Schmeling D, Westhoff A, Kühn M, Bosbach J, Wagner C (2011) Largescale flow structures and heat transport of turbulent forced and mixed convection in a closed rectangular cavity. Int J Heat Fluid Flow 32:889–900CrossRef
Westhoff A, Bosbach J, Schmeling D, Wagner C (2010) Experimental study of lowfrequency oscillations and largescale circulations in turbulent mixed convection. Int J Heat Fluid Flow 31:794–804CrossRef
Wieneke B (2008) Volume selfcalibration for 3D particle image velocimetry. Exp Fluids 45:549–556CrossRef
Worth NA, Nickels TB (2008) Acceleration of TomoPIV by estimating the initial volume intensity distribution. Exp Fluids 45:847–856CrossRef
 Title
 Largescale tomographic PIV in forced and mixed convection using a parallel SMART version
 Journal

Experiments in Fluids
Volume 53, Issue 1 , pp 91103
 Cover Date
 20120701
 DOI
 10.1007/s0034801213019
 Print ISSN
 07234864
 Online ISSN
 14321114
 Publisher
 SpringerVerlag
 Additional Links
 Topics
 Industry Sectors
 Authors

 Matthias Kühn ^{(1)}
 Klaus Ehrenfried ^{(1)}
 Johannes Bosbach ^{(1)}
 Claus Wagner ^{(1)}
 Author Affiliations

 1. Institute of Aerodynamics and Flow Technology, German Aerospace Center (DLR), Bunsenstraße 10, 37073, Göttingen, Germany