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Large-scale Coherent Structures in Turbulent Mixed Convective Air Flow

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Part of the Notes on Numerical Fluid Mechanics and Multidisciplinary Design book series (NNFM,volume 124)


We report on an experimental study of mixed convective air flow in a cuboidal container with an inlet and outlet slot at \(\mathcal {A} r = 3.3\), \(\mathcal {R} e= 1.0 \times 10^4\), \(\mathcal {R} a= 2.4 \times 10^8\) at a fluid pressure of \(P = 11.6\,{\mathsf {bar}}\). Particle image velocimetry were performed with the objective to identify the dynamics of the large-scale circulations. In addition, we applied temperature measurements to determine the heat transport. Due to the unsteady nature of mixed convection in the present configuration, the velocity vector fields were subjected to a proper orthogonal decomposition in order to extract the predominant coherent structures. The analysis uncovers two structures consisting of three and four thermally induced large-scale circulations, which are arranged in longitudinal direction. Further, we found that the dynamics and the topology of the convection rolls strongly influences the heat transport between the container‘s inlet and outlet.


  • Turbulent mixed convection
  • Proper orthogonal decomposition
  • Coherent structures
  • Large-scale circulation
  • Heat transport

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Westhoff, A., Bosbach, J., Wagner, C. (2014). Large-scale Coherent Structures in Turbulent Mixed Convective Air Flow. In: Dillmann, A., Heller, G., Krämer, E., Kreplin, HP., Nitsche, W., Rist, U. (eds) New Results in Numerical and Experimental Fluid Mechanics IX. Notes on Numerical Fluid Mechanics and Multidisciplinary Design, vol 124. Springer, Cham.

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