Dans ce mémoire, on s’intéresse à la simulation des écoulements liquide-vapeur en transition de phase. Pour décrire ces écoulements, une approche bifluide. Résumé: On s’intéresse dans ce travail à la simulation des écoulements diphasiques. Différents modèles, tous hyperboliques, sont considérés suivant les . Download Citation on ResearchGate | Ecoulement diphasique compressible et immiscible en milieu poreux: analyse mathématique et numérique | L’objectif de .

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This description of the liquid-vapor mixing is associated to the seven-equation model introduced by Baer and Nunziato.

TEL – Thèses en ligne – Modélisation et simulation numérique des écoulements diphasiques

These closure laws comply with an entropy inequality. Furthermore, we establish the linear and nonlinear stabilities of the liquid-vapor equilibrium. The numerical simulation of the strongly unbalanced liquid-vapor flows is at last applied to the safety analysis of the pressurized water nuclear reactors.

Unlike the classic nonconservative framework, these schemes converge towards the same solution. First, a theoretical thermodynamic framework is constructed to describe the liquid-vapor mixing.

The main topic of this work is the simulation of two-phase flows. JavaScript is disabled ecoylement your browser. Metrics Show article metrics. Nicolas Seguin 1 AuthorId: By assuming the two-phase mixture as homogeneous, the treatment of the physical conservation laws makes it possible to obtain an analytical equation of the fluid evolution which expresses the difference between the Fanno and the isothermal evolutions.

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Article Abstract PDF In order to describe these phase transition flows, a two-fluid two-pressure approach is considered. Two Finite Volume schemes are proposed and tested in agreement with the resonant behavior of this model.

Have you forgotten your login? Initial download of the metrics may take a while. One shows that this maximum length is a function ecoullement the mass quality as well as the initial conditions, i.

Wednesday, October 10, – 1: In these cases, the classical description of two-phase flow Thursday, November 15, – The results are systematically verified by considering the limit of a single phase ideal gas flow. Services Same authors – Google Scholar. Modelling and numerical simulation of two-phase flows using the two-fluid two-pressure approach.

The purpose of this work is to propose a derivation of a macroscopic model for a certain class of inertial two-phase, incompressible, Newtonian fluid flow through homogenous porous media. This work focuses on the stationary one-phase Newtonian flow in a class of homogeneous porous media at large enough flow rates leading to a non-linear relationship between the filtration velocity and the pressure gradient.

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The behaviour of an adiabatic two-phase gas-liquid flow through a duct with a constant cross-sectional area is studied from a thermodynamics point of view.

Saturday, September 1, – 8: Files in this item.

This work investigates the properties of this model in order to simulate the phase transition flows occurring in nuclear engineering.

Data correspond to usage on the plateform after Friday, July 18, – The last part corresponds to the analysis of a class of non-conservative hyperbolic models of two-phase flows, based on the two velocity and two pressure two-fluid approach.

Modélisation et simulation numérique des écoulements diphasiques

Vincent Guillemaud 1 Details. Several flow regimes for the two-phase mixing derive from this analysis. Some closure laws for the interfacial velocity and for the interfacial pressure are proposed, allowing to define discontinuous solutions.