Dissertation/ Thesis
Dispersion of non spherical particles in a turbulent flow ; Dispersion de particules non-sphériques en écoulement turbulent
| العنوان: | Dispersion of non spherical particles in a turbulent flow ; Dispersion de particules non-sphériques en écoulement turbulent |
|---|---|
| المؤلفون: | Ouchene, Rafik |
| المساهمون: | Laboratoire d'Energétique et Mécanique Théorique et Appliquée (LEMTA ), Université de Lorraine (UL)-Centre National de la Recherche Scientifique (CNRS), Université de Lorraine, Anne Tanière, Mohammed Khalij |
| المصدر: | https://hal.univ-lorraine.fr/tel-01754568 ; Autre [cond-mat.other]. Université de Lorraine, 2015. Français. ⟨NNT : 2015LORR0275⟩. |
| بيانات النشر: | HAL CCSD |
| سنة النشر: | 2015 |
| المجموعة: | Université de Lorraine: HAL |
| مصطلحات موضوعية: | Hydrodynamic forces, Drag, Lift, Torque, Ellipsoidal particles, DNS, Turbulence, Dispersion, Force hydrodynamique, Traînée, Portance, Couple, Particules ellipsoïdales, Particules (matière), Résistance à l'avancement (hydrodynamique), Relations de dispersion, [PHYS.COND.CM-GEN]Physics [physics]/Condensed Matter [cond-mat]/Other [cond-mat.other] |
| الوصف: | The present work is a part of a program research ANR PLAYER (started from January 2012), the aim of the project is to extend the simulations of gaz-particles flow to the non-spherical particles with a large range of inertia. The main objectives of this project consist, firstly, on the founding of hydrodynamic forces and torques occurring on these non-spherical particles. As results, we focus on the additional degrees of freedom that must be considered, shape effects and effects of inertia. Secondly, we are interested on the study of particle-turbulence interaction and particle-particle interaction. The aim of this Phd thesis consists on the studying of the dispersion of solide non-spherical particles in turbulent channel flow at mesoscopic scale. In order to achieve this work, we considered a one way coupling and we used a technique of Particles Lagrangian Tracking coupled with a Direct Numerical Simulation of the turbulent channel flow (DNS/PLT). This technique requires a well prediction of hydrodynamic forces and torques occurring on each particle. In addition, this technique requires a coupling of translational and rotational motions. Firstly, a Direct Numerical Simulation is used with a body-fitted method in CFD code Ansys-Fluent to simulate flow around ellipsoids. Based on the obtained results, models of correlation for hydrodynamic coeffients (drag, lift and torque) are proposed. The major results of this part is the accuracy models for a large ranges of particles Reynolds number, aspect ratio and orientations. Indeed these models take the particle Reynolds number Rep [belongs] [1-240], the shape (aspect ratio w [belongs] [0.2-32]) and the orientation of the particle into account. Secondly, these models of correlation as well as translational and rotational motions are implemented in the in-house DNS code. After a rigorous validation of the code using a different test cases, simulations of dispersion of ellipsoidals particles in a tubulent channel flow is performed for a moderate Reynolds number. Three ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | French |
| Relation: | NNT: 2015LORR0275; tel-01754568; https://hal.univ-lorraine.fr/tel-01754568; https://hal.univ-lorraine.fr/tel-01754568/document; https://hal.univ-lorraine.fr/tel-01754568/file/DDOC_T_2015_0275_OUCHENE.pdf |
| الاتاحة: | https://hal.univ-lorraine.fr/tel-01754568 https://hal.univ-lorraine.fr/tel-01754568/document https://hal.univ-lorraine.fr/tel-01754568/file/DDOC_T_2015_0275_OUCHENE.pdf |
| Rights: | info:eu-repo/semantics/OpenAccess |
| رقم الانضمام: | edsbas.C8EEBBEF |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |