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Genre/Form: | Thèses et écrits académiques |
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Additional Physical Format: | Analyse expérimentale : simulation directe et des grandes échelles d'un panache thermique tridimensionnel en rotation / Minh-Vuong Pham Lille : Atelier national de reproduction des thèses, 2005 Microfiches. (@Lille-Thèses) (ABES)259566152 |
Material Type: | Thesis/dissertation |
Document Type: | Book |
All Authors / Contributors: |
Minh-Vuong Pham; Son Doan-Kim; Frédéric Plourde; Ecole nationale supérieure de mécanique et d'aérotechnique (Chasseneuil-du-Poitou, Vienne, département).; Université de Poitiers. UFR des sciences fondamentales et appliquées.; École doctorale des sciences pour l'ingénieur et aéronautique - SPI&A (Poitiers).; Université de Poitiers. |
OCLC Number: | 491580845 |
Description: | 1 vol. ([8]-172 p.) ; 30 cm. |
Responsibility: | Minh-Vuong Pham ; [sous la direction de] Son Doan-Kim et Frédéric Plourde. |
Abstract:
Analysis of the thermal plume flows, with or without rotation of its source, constitutes the principal objective of this present report based either on experimental investigations or on direct (DNS) and large-eddy simulations (LES). Under static condition, it was shown that the movement is driven by expulsion and contraction phases in the lateral direction. These mechanisms are directly generated by convection of coherent original thermal structures which develops vicinity of the thermal plume. Several subgrid models were proposed in the LES and a lagrangian "thermal" model was proposed and the whole of the principal characteristics of a turbulent thermal plume was perfectly described. The rotation of the heated source generates a shear layer which accelerates the breaking down of coherent structures. The classical laws are still valid under rotating conditions however their characteristics are modified when the rotating velocities are above a critical value. Entrainment mechanisms, through contraction and expulsion phases, are also amplified under the influence of rotation.
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