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You searched for subject:(dissipative effects). Showing records 1 – 2 of 2 total matches.

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University of Adelaide

1. Borazjani, Sara. Analytical modelling of two-phase multi-component flow in porous media with dissipative and non-equilibrium effects.

Degree: 2016, University of Adelaide

Hereby I present a PhD thesis by publications. The thesis includes five journal papers, of which two have already been published and three have been submitted for publication and are presently under review. The journals include high-impact-factor ones (Water Resources Research, Applied Mathematics Letters and Transport in Porous Media), and also Journal of Petroleum Science and Engineering, which is a major academic journal in petroleum industry. The thesis develops a new version of so-called splitting theory. The current 2006- version of the theory encompasses analytical modelling of thermodynamicallyequilibrium conservation law systems for two-phase multicomponent flow in porous media. The theory allows the derivation of numerous analytical solutions. The thesis generalizes the splitting method and applies it for flow systems with dissipation, nonequilibrium phase transitions and chemical reactions. It is shown how the general n×n system is split into an (n-1)×(n-1) auxiliary system and one scalar lifting equation. The auxiliary system contains thermodynamic parameters only, while the lifting equation contains transport properties and solves for phase saturation. First application of the splitting method is developed for low-salinity waterflooding. Two major effects are accounted for: the wettability alternation and the induction of fines migration, straining and attachment. One-dimensional (1D) problems of sequential injection of high-salinity water slug, low salinity water slug and high-salinity water chase drive corresponds to one of the most promising modern processes of Enhanced Oil Recovery, which currently is under intensive investigation in major world oil companies. Both auxiliary and lifting problems allow for exact solutions. The exact analytical solution consists of implicit formulae for profiles of phase saturations, salinity and fine particle concentrations. The exact solution allows for deriving explicit formulae in oil recovery. The solution permits the comparative study of the impact of both effects, which are the wettability alternation and the induction of fines migration, on incremental recovery. It was found out that both effects are significant for typical values of the physics constants. The exact solution allows for multi-variant study to optimize the injected water composition in a concrete oilfield. The second application of the splitting method corresponds to 1D displacement of oil by a low-salinity polymer slug followed by a low-salinity water slug and, finally, high salinity water chase drive. This problem corresponds to the Enhanced Oil Recovery Method that merges two traditional methods of polymer- and low-salinity water-floods. The exact analytical solutions are the result of the splitting system. The method was also generalized for the case of several low-salinity slugs and Non- Newtonian properties of the polymer solution. The exact solution yields explicit formulae for propagation of saturation and concentration shocks, dynamics of different flow zones and explicit formulae for… Advisors/Committee Members: Bedrikovetsky, Pavel (advisor), Roberts, Anthony John (advisor), Australian School of Petroleum (school).

Subjects/Keywords: analytical solution; two-phase flow; porous media; dissipative effects; non-equilibrium effects; Research by Publication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Borazjani, S. (2016). Analytical modelling of two-phase multi-component flow in porous media with dissipative and non-equilibrium effects. (Thesis). University of Adelaide. Retrieved from http://hdl.handle.net/2440/106453

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Borazjani, Sara. “Analytical modelling of two-phase multi-component flow in porous media with dissipative and non-equilibrium effects.” 2016. Thesis, University of Adelaide. Accessed July 19, 2019. http://hdl.handle.net/2440/106453.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Borazjani, Sara. “Analytical modelling of two-phase multi-component flow in porous media with dissipative and non-equilibrium effects.” 2016. Web. 19 Jul 2019.

Vancouver:

Borazjani S. Analytical modelling of two-phase multi-component flow in porous media with dissipative and non-equilibrium effects. [Internet] [Thesis]. University of Adelaide; 2016. [cited 2019 Jul 19]. Available from: http://hdl.handle.net/2440/106453.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Borazjani S. Analytical modelling of two-phase multi-component flow in porous media with dissipative and non-equilibrium effects. [Thesis]. University of Adelaide; 2016. Available from: http://hdl.handle.net/2440/106453

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

2. Lacombe, Lionel. On dynamics beyond time-dependent mean-field theories : Dynamique au-delà des théories de champ moyen dépendant du temps.

Degree: Docteur es, Physique de la matière, 2016, Université Toulouse III – Paul Sabatier

Cette thèse présente différentes approches quantiques pour l'exploration de processus dynamiques dans des systèmes multiélectroniques, en particulier après une forte excitation qui peut aboutir à des effets dissipatifs. Les théories de champ moyen sont un outil utile à cet égard. Malgré l'existence de nombreux travaux réalisés ces deux dernières décennies, ces théories peinent à reproduire complètement la corrélation à deux corps. La thermalisation est un des effets des collisions électron-électron. Après un chapitre introductif, on présentera dans le chapitre 2 le formalisme de plusieurs méthodes étudiées dans cette thèse, ayant pour but la description de ces effets en ajoutant un terme de collision au champ moyen. Ces méthodes sont appelées Stochastic Time-Dependent Hartree Fock (STDHF), Extended TDHF (ETDHF) et Collisional TDHF (CTDHF). Cette dernière méthode représente d'une certaine façon le résultat principal de cette thèse. L'implémentation numérique de chacune de ces méthodes sera aussi examinée en détail. Dans les chapitres 3, 4 et 5, nous appliquerons à différents systèmes les méthodes présentées dans le chapitre 2. Dans le chapitre 3, nous étudions d'abord un canal de réaction rare, ici la probabilité d'un électron de s'attacher à un petit agrégat d'eau. Un bon accord avec les données expérimentales a été observé. Dans le chapitre 4, un modèle fréquemment utilisé en physique nucléaire est résolu exactement et comparé quantitativement à STDHF. L'évolution temporelle des observables à un corps s'accorde entre les deux méthodes, plus particulièrement en ce qui concerne le comportement thermique. Néanmoins, pour permettre une bonne description de la dynamique, il est nécessaire d'avoir une grande statistique, ce qui peut être un frein à l'utilisation de STDHF sur de larges systèmes. Pour surpasser cette difficulté, dans le chapitre 5 nous testons CTDHF, qui a été introduit dans le chapitre 2, sur un modèle à une dimension (et sans émission électronique). Le modèle se compose d'électrons dans un potentiel de type jellium avec une interaction auto-cohérente sous la forme d'une fonctionnelle de la densité. L'avantage de ce modèle à une dimension est que les calculs STDHF sont possibles numériquement, ce qui permet une comparaison directe aux calculs CTDHF. Dans cette étude de validité du concept, CTDHF s'accorde remarquablement bien avec STDHF. Cela pose les jalons pour une description efficace de la dissipation dans des systèmes réalistes en trois dimensions par CTDHF.

This thesis presents various quantal approaches for the exploration of dynamical processes in multielectronic systems, especially after an intense excitation which can possibly lead to dissipative effects. Mean field theories constitute useful tools in that respect. Despite the existence of numerous works during the past two decades, they have strong difficulties to capture full 2-body correlations. Thermalization is one of these effects that stems from electron-electron collisions. After an introductory chapter, we present in Chapter 2 the…

Advisors/Committee Members: Dinh, Phuong Mai (thesis director).

Subjects/Keywords: Théorie de la fonctionnelle de la densité; Matrice densité; Extended time-dependent Hartree-Fock; Stochastic time-dependent Hartree-Fock; Collisional time-dependent Hartree-Fock; Effets dissipatifs; Au-delà du champ moyen; Density Functional Theory; Density Functional Theory; Density Functional Theory; Density Functional Theory; Density Functional Theory; Dissipative effects; Dissipative effects

Record DetailsSimilar RecordsGoogle PlusoneFacebookTwitterCiteULikeMendeleyreddit

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6th Edition):

Lacombe, L. (2016). On dynamics beyond time-dependent mean-field theories : Dynamique au-delà des théories de champ moyen dépendant du temps. (Doctoral Dissertation). Université Toulouse III – Paul Sabatier. Retrieved from http://www.theses.fr/2016TOU30185

Chicago Manual of Style (16th Edition):

Lacombe, Lionel. “On dynamics beyond time-dependent mean-field theories : Dynamique au-delà des théories de champ moyen dépendant du temps.” 2016. Doctoral Dissertation, Université Toulouse III – Paul Sabatier. Accessed July 19, 2019. http://www.theses.fr/2016TOU30185.

MLA Handbook (7th Edition):

Lacombe, Lionel. “On dynamics beyond time-dependent mean-field theories : Dynamique au-delà des théories de champ moyen dépendant du temps.” 2016. Web. 19 Jul 2019.

Vancouver:

Lacombe L. On dynamics beyond time-dependent mean-field theories : Dynamique au-delà des théories de champ moyen dépendant du temps. [Internet] [Doctoral dissertation]. Université Toulouse III – Paul Sabatier; 2016. [cited 2019 Jul 19]. Available from: http://www.theses.fr/2016TOU30185.

Council of Science Editors:

Lacombe L. On dynamics beyond time-dependent mean-field theories : Dynamique au-delà des théories de champ moyen dépendant du temps. [Doctoral Dissertation]. Université Toulouse III – Paul Sabatier; 2016. Available from: http://www.theses.fr/2016TOU30185

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