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Les of Turbulent Thermal Convection

  • Antonella Abbà
  • Carlo Cercignani
  • Lorenzo Valdettaro
  • Paolo Zanini
Conference paper
Part of the ERCOFTAC Series book series (ERCO, volume 5)

Abstract

We describe results obtained from Large Eddy Simulations (LES) of turbulent natural convection flow in an infinite horizontal fluid layer heated from below. We use a dynamic subgrid scale model in scaling formulation, and discuss an anisotropic modification of it. The largest Rayleigh number successfully simulated is 108 with an aspect ratio of 7. Average properties of the resulting flow are computed and compared with DNS data in the literature. An a priori test is done, that allows us to compare the models. The probability distribution functions of temperature fluctuations at different Rayleigh numbers are compared. Finally, flow structures at largest simulated Rayleigh number are investigated.

Keywords

Nusselt Number Rayleigh Number Large Eddy Simulation Direct Numerical Simulation Thermal Boundary Layer 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media Dordrecht 1997

Authors and Affiliations

  • Antonella Abbà
    • 1
  • Carlo Cercignani
    • 1
  • Lorenzo Valdettaro
    • 1
  • Paolo Zanini
    • 1
  1. 1.Department of MathematicsPolitecnico di MilanoMilanoItaly

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