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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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.
Vincent Guillemaud 1 Details. The numerical simulation of the strongly unbalanced liquid-vapor flows is at last applied to the safety analysis of the pressurized water nuclear ecoulemeht. Two Finite Volume schemes are proposed and tested in agreement with the resonant behavior of this model. Furthermore, a new relaxation scheme is proposed to approach the interfacial transfers.
First, a theoretical thermodynamic framework is constructed to describe the liquid-vapor mixing. Some features of this site may not work without it. Metrics Show article metrics. Using a fractional step approach, a Finite Volume method is at last constructed to simulate this model.
Thursday, November 15, – This scalar equation is a simplified model of a oil-liquid mixture flowing in a porous media.
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Initial download of the metrics may take a while. This description of the liquid-vapor mixing is associated to the seven-equation model introduced by Baer and Nunziato. Provided with this framework, various modelling choices are suggested for the interaction terms between the phases.
Dipahsique article Next article. Wednesday, October 10, – 1: The main topic of this work is the simulation of two-phase flows.
Modélisation et simulation numérique des écoulements diphasiques
Tuesday, September 11, riphasique 9: The purpose of this work is to propose a derivation of a macroscopic model for a certain class of ecoulementt two-phase, incompressible, Newtonian fluid flow through homogenous porous media. The existence and uniqueness of the weak entropy solution of a conservation law is proved afterwards. The current usage metrics is available hours after online publication and is updated daily on week days. One shows that this maximum length is a function of the mass quality as well as the initial conditions, i.
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. Two-phase non-Darcy flow in heterogeneous porous media: Several flow regimes for the two-phase mixing derive from this analysis.
Using this numerical method, a careful comparison between the one- and two-pressure two-fluid models is presented. These closure laws comply with an entropy inequality.
It is applied to the two-phase flow through discharge lines involving geometrical singularities sudden enlargement for example. Modelling ecoulenent numerical simulation of two-phase flows using the two-fluid two-pressure approach.
TEL – Thèses en ligne – Modélisation et simulation numérique des écoulements diphasiques
Saturday, September 1, – 8: Several hyperbolic models are considered here. Unlike the classic nonconservative framework, these schemes converge towards the same solution. The mathematical properties of this model are thereafter examined.
Several numerical experiments are investigated: Nicolas Seguin 1 Details.