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Sur les modèles stochastiques lagrangiens de suivi de particules dans un champ turbulent et leur application en écoulements gaz-solide confinés

Abstract : This work lies on the Lagrangian approach of particle dispersion in a turbulent flow. The fluid turbulent motion at the discrete particle location is predicted using a stochastic model based on the knowledge of the autocorrelation coefficient of the fluid " seen " by the particle. The proposed stochastic model ARMA(2,1) is consistent with Wang and Stock's analytical form (1993) describing the autocorrelation function of the fluid seen. A parametric study of the particle dispersion in a homogeneous, isotropic stationary turbulent flow has shown that a non-linear drag force can make the particle anisotropy more pronounced. Our study has been extended to gas-solid pipe flows. Several dispersion models have been compared. We have put emphasis that in the case of small particles it is very important to correctly model the non homogeneous character of the turbulent flow.
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https://hal.univ-lorraine.fr/tel-01746584
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Submitted on : Thursday, March 29, 2018 - 10:40:45 AM
Last modification on : Saturday, October 16, 2021 - 11:22:03 AM

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  • HAL Id : tel-01746584, version 1

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Anélie Pétrissans. Sur les modèles stochastiques lagrangiens de suivi de particules dans un champ turbulent et leur application en écoulements gaz-solide confinés. Autre. Université Henri Poincaré - Nancy 1, 2001. Français. ⟨NNT : 2001NAN10194⟩. ⟨tel-01746584⟩

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