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 siphasique model is validated on the basis of experimental data obtained for quasi steady-state discharges of pure nitrogen and water-nitrogen mixture through a complex pressure relief line involving several abrupt enlargements.

Vincent Guillemaud 1 AuthorId: On the basis of its differential form and the second principle of thermodynamic, the properties of this flow are discussed.

Modélisation et simulation numérique des écoulements diphasiques

Several numerical experiments are investigated: Volume 53, Number 6November-December The theory allows to understand and to justify the existence of the so-called multichoked flow. Thursday, November 15, – Several hyperbolic models are considered here. The starting point of the diphasiqeu Our interest in this work is the stationary one-phase Newtonian flow in a class of homogeneous porous media at large enough flow rates requiring the introduction of the inertial forces at the pore-scale.

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Tuesday, September 11, – 9: The main topic of this work is the simulation of two-phase flows. Files in this item. These closure laws comply with an entropy inequality. By assuming the two-phase mixture as homogeneous, the treatment of the physical conservation laws makes ecoulemebt possible to obtain an analytical equation of the fluid evolution which expresses the difference between the Fanno and the isothermal evolutions.

The results are systematically verified by considering the limit of a single phase ideal gas flow. This description of the liquid-vapor mixing is associated to the seven-equation model introduced by Baer and Nunziato.

The convective part is approximated by Finite Volume schemes and the relaxation terms are taken into account with the help of a splitting method. Friday, April 9, – 1: Using a fractional step approach, a Finite Volume method is at last constructed to simulate this model.

Finally, the implementation of a turbulence model and the introduction of a reconstruction process for the interfacial area are investigated in order to refine the description of the interfacial transfers. Vincent Guillemaud 1 Details.

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

Have you forgotten your login? Using this numerical method, a careful comparison between the one- and two-pressure two-fluid models is presented. Furthermore, a new relaxation scheme is proposed to approach the interfacial transfers.

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Modelling and numerical simulation of two-phase flows using the two-fluid two-pressure approach. Current usage metrics About article metrics Return to article.

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

In these cases, the classical description of two-phase flow Initial download of the metrics may take a while. Some closure laws for the interfacial velocity and for the interfacial pressure are proposed, allowing to define discontinuous solutions. Metrics Show article metrics. Furthermore, we establish the linear and nonlinear stabilities of the liquid-vapor equilibrium.

Provided with these schemes, the whole numerical method preserves the liquid-vapor equilibria. 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.

In the first part, recent Finite Volume schemes are compared for diphaskque approximation of the Homogeneous Equilibrium Model, in particular when the simulation involves low densities. Services Same authors – Google Scholar. Nicolas Seguin 1 AuthorId: Wednesday, October 10, – 1: