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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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. Furthermore, a new relaxation scheme is proposed to approach the interfacial transfers. This description of the liquid-vapor mixing is associated to the seven-equation model introduced by Baer and Nunziato. This work investigates the properties of this model in order to simulate the phase transition flows occurring in nuclear engineering.
The main topic of this work is the simulation of two-phase flows. The theory dlphasique to understand and to justify the existence of the so-called multichoked flow.
Several numerical experiments are investigated: Furthermore, we establish dipbasique linear and nonlinear stabilities of the liquid-vapor equilibrium. Have you forgotten your login? Two Finite Volume schemes are proposed and tested in agreement with the resonant behavior of this model.
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. Thursday, November 15, – The convective part is approximated by Finite Volume schemes and the relaxation terms are taken into account with the help of a splitting method. Files in this item. Unlike the classic nonconservative framework, these schemes converge towards the same solution. The numerical simulation of the strongly unbalanced liquid-vapor flows is at last applied to the safety analysis of the pressurized water nuclear reactors.
On the basis of its differential form and the second principle of thermodynamic, the properties of this flow are discussed.
These closure laws comply with an entropy inequality. Modelling and numerical simulation of two-phase flows using the two-fluid two-pressure approach. Current usage metrics About article metrics Return to article.
The existence and uniqueness of the weak entropy solution of a conservation law is proved afterwards. In these cases, the classical description of two-phase flow Volume 53, Number 6November-December Nicolas Seguin 1 Details.
Modélisation et simulation numérique des écoulements diphasiques
Services Same authors – Google Scholar. For a length greater than this maximum one, the flow is no more possible. Two-phase non-Darcy flow in heterogeneous porous media: Article Abstract PDF Friday, April 9, – 1: 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.
In order to describe these phase transition diphasqiue, a two-fluid two-pressure approach is considered. This thesis is devoted to the modelling and numerical simulation of liquid-vapor flows.
Latest newsletter Previous newsletters. Provided with this framework, various modelling choices are suggested for the interaction terms between the phases. 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. Tuesday, September 11, – 9: Nicolas Seguin 1 AuthorId: Using a fractional step approach, a Finite Volume method is at last constructed to simulate this model.
Some features of this site may not work without it. Diphasiqhe this numerical method, a careful comparison between the one- and two-pressure two-fluid models is presented.
TEL – Thèses en ligne – Modélisation et simulation numérique des écoulements diphasiques
First, various nonconservative adaptations of standard Riemann solvers are diphadique to approach the convective part. Friday, July 18, – The determination of the Fanno limit shows the existence of a maximum length of the duct. One shows that this maximum length is a function of the mass quality as well as the initial conditions, i.
Vincent Guillemaud 1 Details. Saturday, September 1, – 8: Some closure laws for the interfacial velocity and for the interfacial pressure are proposed, allowing to define discontinuous solutions.
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.