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Étude par simulation numérique directe du comportement et de la dispersion de particules solides en écoulement non homogène isotherme ou anisotherme

Abstract : This dissertation is devoted to the investigation of the motion of solid particles in an isothermal and non isothermal inhomogeneous turbulent gas flow using direct numerical simulation. By means of this numerical tool, it was possible to analyse the inertia and crossing trajectory effects on the thermal and dynamical characteristics of the dispersed phase as well as on those of the fluid seen. A better understanding of the influence of these two effects is an important issue in the development of Eulerian-Eulerian and Eulerian-Lagrangian models. The study was conducted by extracting dispersed phase statistics such as concentration, mean and root mean square of the particle velocity, fluid-particle covariances, and triple particle velocity correlations. The characteristics of the fluid seen which were examined are the drift velocity, the Reynolds stresses, and the decorrelation time scales of the fluctuating velocity of the fluid seen. Concerning non isothermal flows, we present the thermal statistics of the dispersed phase as well as those of the fluid seen obtained in a downward channel flow. These aspects are investigated keeping in mind the objective of the present study, i.e. understand the thermal behaviour of the dispersed phase and provide information about crucial parameters which appear in the modelling of such flows.
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Submitted on : Wednesday, April 22, 2009 - 11:34:41 PM
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  • HAL Id : tel-01754330, version 2

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Boris Arcen. Étude par simulation numérique directe du comportement et de la dispersion de particules solides en écoulement non homogène isotherme ou anisotherme. Autre. Université Henri Poincaré - Nancy 1, 2006. Français. ⟨NNT : 2006NAN10163⟩. ⟨tel-01754330v2⟩

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