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TIMF - ISSN 2514-4642 - © ISTE Ltd
Thermodynamics of Interfaces and Fluid Mechanics deals with interfaces that are space areas with a low thickness and which separate environments of different properties. They designate phase separation but also thin flames and waves of discontinuity. At a macroscopic scale, they are associated with material surfaces that possess thermodynamic attributes and their own behavior laws.
The analysis of systems with interfaces involves scale changes and the use of specific techniques such as asymptotic developments, the second gradient theory or the phase field model method. Digital simulation is implemented in order to solve the complex systems studied. Testing is an essential step to solve the set problems.
2D varieties of interfaces often coexist with 1D varieties such as ligaments (atomization), contact lines (set drops) or Plateau’s edges (foams).
The articles in the journal deal with all of the mentioned above subjects.
Thermodynamique des interfaces et mécanique des fluides traite des interfaces qui sont des zones de l’espace de faible épaisseur séparant des milieux à propriétés différentes. Elles désignent les séparations de phase, mais aussi les flammes minces et les ondes de discontinuité. A l’échelle macroscopique, on les assimile à des surfaces matérielles douées de propriétés thermodynamiques et possédant leurs propres lois de comportement.
L’analyse des systèmes comprenant des interfaces implique des changements d’échelle et l’utilisation de techniques spécifiques telles que les développements asymptotiques, la théorie du second gradient ou la méthode des champs de phase. La simulation numérique est mise en œuvre pour résoudre les systèmes complexes étudiés. L’expérimentation est une étape indispensable pour résoudre les problèmes posés.
Les variétés 2D que constituent les interfaces coexistent fréquemment avec des variétés 1D telles les ligaments (atomisation), les lignes de contact (gouttes posées) ou les bords de Plateau (mousses).
Les articles de la revue traitent de l’ensemble des disciplines énumérées plus haut.
This article states a numerical method of finished differences, making it possible to calculate the variables describing an average flow, no viscous and no heavy, through a mobile wheel of a wind mill with horizontal axis, to deduce its performances from them, by using a grid with irregular steps. Centered space discretization’s diagrams inside the calculation domain and decentered towards the interior for the nodes placed on the borders are used. The temporal discretization uses an explicit diagram with two steps of time, with about two precisions. Calculations are made in two stages: a prediction stage and a correction stage. They preceded to calculations of the three-dimensional flow initial state, realized thereafter in its bypass sections. Boundary conditions are imposed on the borders of the calculation domain. Calculation convergence is ensured by numerical viscosity implicitly introduced by the time discretization’s diagrams. The internal stability is ensured by a constraint on the step of temporal discretization in accordance with CFL condition Initial conditions are calculated while realizing, on the flow bypass sections, characteristic quantities initially imposed in the calculation domain volume.
The simulation engine system is an important issue in the automotive industry because of speeding up the design process, and limit the use of physical prototypes testing. The platform AMESim allows to access to libraries models for simulating engine or vehicle. Modeling approaches (0D/1D) do not however allow to match the 3D code accuracy levels. From this the study is on OpenFoam (simulation software CFD 3D) in order to reduce the problem in 1D with opening new perspectives of computing time, and prediction quality.
Editorial Board
Editor in Chief
Roger PRUD’HOMME
Sorbonne Université – CNRS
roger.prud_homme@upmc.fr
Co-Editors
Kwassi ANANI
Université de Lomé
Togo
kanani@univ-lome.tg
Abdon ATANGANA
IGS- Bloemfontein
Republic of South Africa
AtanganaA@ufs.ac.za
Amine CHADIL
CNRS, MSME
amine.chadil@cnrs.fr
Christian CHAUVEAU
CNRS – ICARE
christian.chauveau@cnrs-orleans.fr
Alain MAILFERT
Université de Lorraine
alain.mailfert@univ-lorraine.fr
Mahouton Norbert HOUNKONNOU
University of Abomey-Calavi
Benin
norbert_hounkonnou@cipma.net
Sébastien TANGUY
IMFT - Toulouse
tanguy@imft.fr
Pierre TRONTIN
LMFA - Université de Lyon 1
pierre.trontin@univ-lyon1.fr
Stéphane VINCENT
Université Paris-Est Marne-La-Vallée
stephane.vincent@u-pem.fr