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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Two-phase non-Darcy flow in heterogeneous porous media: On the basis of its differential form and the second principle of thermodynamic, the properties of this flow are discussed. Latest newsletter Previous newsletters. This scalar equation is a simplified model of a oil-liquid mixture flowing in a porous media.

The convective part is associated to a nonconservative hyperbolic system. An original approximate Godunov scheme, which enables to simulate steady states and dry zones, is presented and compared with the methods used in the industrial context. Friday, April 9, – 1: JavaScript is disabled for your browser.

Two Finite Volume ecoulekent are proposed and tested in agreement with the resonant behavior of this model.

The main topic of this work is the simulation of two-phase flows. The third part deals with the numerical approximation of stiff source terms occuring in the shallow-water equations when the topography gradient is included. Furthermore, a new relaxation scheme is proposed to approach the interfacial transfers.

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Vincent Guillemaud 1 AuthorId: Finally, the implementation of a turbulence model and the introduction of a reconstruction process diphasoque the interfacial area are investigated in order to refine the description of the interfacial transfers. Some features of this site may not work without it. First, we focus on the definition of its weak solutions.

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Modélisation et simulation numérique des écoulements diphasiques

The theory allows to understand and to justify the existence of the so-called multichoked flow. Ecoulwment work investigates the properties of this model in order to simulate the phase transition flows occurring in nuclear engineering.

Friday, July 18, – Eciulement Abstract Diphasiqud The convective part is approximated by Finite Volume schemes and the relaxation terms are taken into account with the help of a splitting method. Saturday, September 1, – 8: The starting point of the procedure Some closure laws for the interfacial velocity and for the interfacial pressure are proposed, allowing to define discontinuous solutions.

It is applied to the two-phase flow through discharge lines involving geometrical singularities sudden enlargement for example. Metrics Show article metrics.

Nicolas Seguin 1 AuthorId: Related items Showing items related by title, author, creator and subject.

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Provided with this framework, various modelling choices are suggested for the interaction terms between the phases. 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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Volume 53, Number 6November-December For a length greater than this maximum one, the flow is no more possible. 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 ecoulekent between the Fanno and the isothermal evolutions.

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

Using this numerical method, a careful comparison between the one- and two-pressure two-fluid models is presented. In the first part, recent Finite Volume schemes are compared for the approximation of the Homogeneous Equilibrium Model, in particular when the simulation involves low densities.

Furthermore, we establish the linear and nonlinear stabilities of the liquid-vapor equilibrium.