subject:(M thode Level Set)

1. Dugast, Florian. Optimisation topologique en convection thermique avec la méthode de Lattice Boltzmann : Topology optimization, Convective problems, Lattice Boltzmann Method, GPU computing, Level- Set Function.

Degree: Docteur es, Energétique, thermique, combustion, 2018, Nantes

URL: http://www.theses.fr/2018NANT4056

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L’optimisation des transferts de chaleur est un enjeu de recherche important pour améliorer les performances des systèmes énergétiques, notamment des échangeurs de chaleur. Cette optimisation… (more)

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L’optimisation des transferts de chaleur est un enjeu de recherche important pour améliorer les performances des systèmes énergétiques, notamment des échangeurs de chaleur. Cette optimisation peut s’appuyer sur différents leviers, comme le choix du régime d’écoulement, ou la modification de la géométrie de l’échangeur. C’est sur ce deuxième angle que nous avons travaillé au cours de cette thèse, en proposant une méthode d’optimisation topologique. Le nombre de paramètres impliqués dans cette méthode est important (plusieurs milliers). Une méthode à gradient est donc employée. Le calcul du gradient de la fonction de coût en fonction des paramètres de design est facilité par l’emploi d’une méthode adjointe. Le problème direct est résolu à l’aide de la méthode de Lattice Boltzmann (LBM). L’implémentation aisée des conditions aux limites dans l’algorithme LBM est un bénéfice pour l’optimisation topologique. De plus, la formulation de la LBM est explicite et hautement parallélisable, notamment sur les cartes graphiques (GPU), utilisées au cours de cette thèse. Ensuite le domaine d’optimisation est composé de fluide et de solide. Leur distribution est définie par une fonction Level- Set (LSF). Cette fonction est continue et le contour zéro définit précisément l’interface fluide/solide. La méthode d’optimisation développée a été testée et validée pour différents objectifs (minimisation de la température moyenne, maximisation de l’échange de chaleur) et contraintes (limitation des pertes de charges, porosité fixée).

Heat transfer enhancement is an important research area to improve the efficiency of energy systems, especially for heat exchangers. There are different ways of optimizing such systems as the choice of flow regime or the modification on the fluid channels geometry. This thesis is focused on the latter option with the development of a topology optimization method. The number of design parameters involved in this technique is important (several thousands) so a gradient-based method is employed. The calculation of the cost function gradient with respect to the design variables is done with an adjoint-state method. The forward problem is solved with the Lattice Boltzmann Method (LBM). The simple implementation of the LBM boundary conditions is an interesting feature for topology optimization. The LBM algorithm is also highly parallelizable and GPU cards have been used in this thesis to obtain fast computational times. The efficiency of the LBM is important because the forward problem must be solved at each optimization step. Then, the optimization domain is composed of either solid of fluid elements. This material distribution is defined by a Level-Set Function (LSF). This is a continuous function in which the zero contour defines the fluid/solid interface, allowing an accurate description of both domains. The proposed optimization method has been tested for different objectives (minimization of the mean temperature, maximization of heat transfer rate) and constraints (pressure drops limitation, fixed porosity).

Advisors/Committee Members: Luo, Lingai (thesis director), Fan, Yilin (thesis director), Josset, Christophe (thesis director).

Subjects/Keywords: Problème convectif; Fonction Level-Set

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

APA (6^th Edition):

Dugast, F. (2018). Optimisation topologique en convection thermique avec la méthode de Lattice Boltzmann : Topology optimization, Convective problems, Lattice Boltzmann Method, GPU computing, Level- Set Function. (Doctoral Dissertation). Nantes. Retrieved from http://www.theses.fr/2018NANT4056

Chicago Manual of Style (16^th Edition):

Dugast, Florian. “Optimisation topologique en convection thermique avec la méthode de Lattice Boltzmann : Topology optimization, Convective problems, Lattice Boltzmann Method, GPU computing, Level- Set Function.” 2018. Doctoral Dissertation, Nantes. Accessed March 07, 2021. http://www.theses.fr/2018NANT4056.

MLA Handbook (7^th Edition):

Dugast, Florian. “Optimisation topologique en convection thermique avec la méthode de Lattice Boltzmann : Topology optimization, Convective problems, Lattice Boltzmann Method, GPU computing, Level- Set Function.” 2018. Web. 07 Mar 2021.

Vancouver:

Dugast F. Optimisation topologique en convection thermique avec la méthode de Lattice Boltzmann : Topology optimization, Convective problems, Lattice Boltzmann Method, GPU computing, Level- Set Function. [Internet] [Doctoral dissertation]. Nantes; 2018. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2018NANT4056.

Council of Science Editors:

Dugast F. Optimisation topologique en convection thermique avec la méthode de Lattice Boltzmann : Topology optimization, Convective problems, Lattice Boltzmann Method, GPU computing, Level- Set Function. [Doctoral Dissertation]. Nantes; 2018. Available from: http://www.theses.fr/2018NANT4056

2. Ovsyannikov, Andrey. Nouveau développement de la méthode Level Set sur la base d'une équation modifiée de suivi d'interface : Further development of Level Set method : modified level set equation and its numerical assessment.

Degree: Docteur es, Mécanique des fluides, 2013, Ecully, Ecole centrale de Lyon

URL: http://www.theses.fr/2013ECDL0013

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Pas de résumé

The level set method was introduced by Osher & Sethian (1988) as a general technique to capture moving interfaces. It has been… (more)

Subjects/Keywords: Méthode Level Set; Suivi d'interface; Level Set method; Numerical assessment

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APA (6^th Edition):

Ovsyannikov, A. (2013). Nouveau développement de la méthode Level Set sur la base d'une équation modifiée de suivi d'interface : Further development of Level Set method : modified level set equation and its numerical assessment. (Doctoral Dissertation). Ecully, Ecole centrale de Lyon. Retrieved from http://www.theses.fr/2013ECDL0013

Chicago Manual of Style (16^th Edition):

Ovsyannikov, Andrey. “Nouveau développement de la méthode Level Set sur la base d'une équation modifiée de suivi d'interface : Further development of Level Set method : modified level set equation and its numerical assessment.” 2013. Doctoral Dissertation, Ecully, Ecole centrale de Lyon. Accessed March 07, 2021. http://www.theses.fr/2013ECDL0013.

MLA Handbook (7^th Edition):

Ovsyannikov, Andrey. “Nouveau développement de la méthode Level Set sur la base d'une équation modifiée de suivi d'interface : Further development of Level Set method : modified level set equation and its numerical assessment.” 2013. Web. 07 Mar 2021.

Vancouver:

Ovsyannikov A. Nouveau développement de la méthode Level Set sur la base d'une équation modifiée de suivi d'interface : Further development of Level Set method : modified level set equation and its numerical assessment. [Internet] [Doctoral dissertation]. Ecully, Ecole centrale de Lyon; 2013. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2013ECDL0013.

Council of Science Editors:

Ovsyannikov A. Nouveau développement de la méthode Level Set sur la base d'une équation modifiée de suivi d'interface : Further development of Level Set method : modified level set equation and its numerical assessment. [Doctoral Dissertation]. Ecully, Ecole centrale de Lyon; 2013. Available from: http://www.theses.fr/2013ECDL0013

3. Desmaison, Olivier. Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur : Numerical modeling of a hybrid arc / laser welding process in a level set framework : application to multipass welding of high thickness steel sheets.

Degree: Docteur es, Mécanique numérique, 2013, Paris, ENMP

URL: http://www.theses.fr/2013ENMP0079

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Le soudage hybride arc / laser représente une solution adéquate à l'assemblage de tôles d'acier de forte épaisseur. La présence d'une source laser en amont… (more)

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Le soudage hybride arc / laser représente une solution adéquate à l'assemblage de tôles d'acier de forte épaisseur. La présence d'une source laser en amont de la torche MIG permet d'accroître la productivité du procédé tout en assurant une excellente qualité de la soudure. Cependant la phénoménologie complexe de ce procédé multiphysique n'est pas encore totalement maîtrisée, ce qui motive le développement d'outils de simulation numérique. La présente étude s'est déroulée dans le cadre d'un projet multipartenaires "SISHYFE" (ANR Matériaux et Procédés).Dans ce but un modèle éléments finis 3D non stationnaire a été développé. Construit à partir de l'approche level set, il est en mesure de simuler un procédé multi-passes de soudage hybride arc / laser. Il a été développé autour de quatre principaux axes. (1) Une modélisation plus réaliste de l'apport de chaleur a conduit à la définition d'un nouveau modèle basé sur le rayonnement thermique pour décrire la source MIG. (2) Grâce au couplage entre l'intégration de termes source de matière et de chaleur dans les équations de conservation et l'actualisation de l'interface gaz / métal, le modèle proposé est capable de simuler le développement d'un cordon de soudure. (3) L'intégration d'une modélisation des écoulements du bain de fusion dans une approche level set a été évaluée et son impact sur la distribution thermique dans le métal analysé. (4) La simulation de la formation des contraintes pendant et après soudage a été possible grâce à l'adaptation d'un solveur thermomécanique.La modélisation finale a permis de simuler une configuration industrielle de soudage hybride arc / laser multi-passes. Des mesures expérimentales effectuées par les partenaires du projet "SISHYFE" ont été utilisées afin d'évaluer le modèle et d'éprouver sa capacité à reproduire l'expérience.

Hybrid arc / laser welding represents the solution for high thickness steel sheets assembly. The laser heat source added to the MIG torch improves the process productivity while respecting quality standards. Nevertheless, the phenomenology of the process remains complex and not totally understood. This is the thrust for the development of numerical simulation. The present study has been carried out as part of the "SISHYFE" Material and Process ANR project.For that purpose, a new non stationary 3D finite element model has been developed. Based on the level set approach, it allows to simulate a multipass hybrid arc/ laser welding process. The work focused on four research axes. (1) A more representative model of the plasma heat source has been defined, based on thermal radiation. (2) The coupling of a material and a heat source term integrated in the conservation equations and the update of the level set gas / metal interface is able to correctly model the formation of the weld bead. (3) The integration of a fluid flow model within the level set approach has been evaluated and its impact on thermal distribution analyzed. (4) The stress formation during and after the process has been modeled through the adaptation…

Advisors/Committee Members: Bellet, Michel (thesis director).

Subjects/Keywords: Soudage; Level Set; Écoulements; Contraintes; Welding; Level Set; Flows; Stresses

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

APA (6^th Edition):

Desmaison, O. (2013). Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur : Numerical modeling of a hybrid arc / laser welding process in a level set framework : application to multipass welding of high thickness steel sheets. (Doctoral Dissertation). Paris, ENMP. Retrieved from http://www.theses.fr/2013ENMP0079

Chicago Manual of Style (16^th Edition):

Desmaison, Olivier. “Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur : Numerical modeling of a hybrid arc / laser welding process in a level set framework : application to multipass welding of high thickness steel sheets.” 2013. Doctoral Dissertation, Paris, ENMP. Accessed March 07, 2021. http://www.theses.fr/2013ENMP0079.

MLA Handbook (7^th Edition):

Desmaison, Olivier. “Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur : Numerical modeling of a hybrid arc / laser welding process in a level set framework : application to multipass welding of high thickness steel sheets.” 2013. Web. 07 Mar 2021.

Vancouver:

Desmaison O. Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur : Numerical modeling of a hybrid arc / laser welding process in a level set framework : application to multipass welding of high thickness steel sheets. [Internet] [Doctoral dissertation]. Paris, ENMP; 2013. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2013ENMP0079.

Council of Science Editors:

Desmaison O. Modélisation numérique d'un procédé de soudage hybride arc / laser en approche level set : application au soudage multi-passes de tôles d'acier de forte épaisseur : Numerical modeling of a hybrid arc / laser welding process in a level set framework : application to multipass welding of high thickness steel sheets. [Doctoral Dissertation]. Paris, ENMP; 2013. Available from: http://www.theses.fr/2013ENMP0079

4. Titta, Andrea. Simulations level-set d’un amas de bulles cisaillées : écoulement et dynamique des tensioactifs : Level-set simulations of a cluster of sheared bubbles : flow and dynamics of surfactants.

Degree: Docteur es, Mécanique des fluides, 2017, Lyon

URL: http://www.theses.fr/2017LYSE1176

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Les mousses sont des assemblées de bulles de gaz dans une matrice liquide et sont utilisées dans plusieurs applications telles que par exemple l'isolation thermique… (more)

Subjects/Keywords: Tensioactifs; Bulles; Simulations level-set; Surfactants; Bubbles; Level-set simulations; 532

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APA (6^th Edition):

Titta, A. (2017). Simulations level-set d’un amas de bulles cisaillées : écoulement et dynamique des tensioactifs : Level-set simulations of a cluster of sheared bubbles : flow and dynamics of surfactants. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2017LYSE1176

Chicago Manual of Style (16^th Edition):

Titta, Andrea. “Simulations level-set d’un amas de bulles cisaillées : écoulement et dynamique des tensioactifs : Level-set simulations of a cluster of sheared bubbles : flow and dynamics of surfactants.” 2017. Doctoral Dissertation, Lyon. Accessed March 07, 2021. http://www.theses.fr/2017LYSE1176.

MLA Handbook (7^th Edition):

Titta, Andrea. “Simulations level-set d’un amas de bulles cisaillées : écoulement et dynamique des tensioactifs : Level-set simulations of a cluster of sheared bubbles : flow and dynamics of surfactants.” 2017. Web. 07 Mar 2021.

Vancouver:

Titta A. Simulations level-set d’un amas de bulles cisaillées : écoulement et dynamique des tensioactifs : Level-set simulations of a cluster of sheared bubbles : flow and dynamics of surfactants. [Internet] [Doctoral dissertation]. Lyon; 2017. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2017LYSE1176.

Council of Science Editors:

Titta A. Simulations level-set d’un amas de bulles cisaillées : écoulement et dynamique des tensioactifs : Level-set simulations of a cluster of sheared bubbles : flow and dynamics of surfactants. [Doctoral Dissertation]. Lyon; 2017. Available from: http://www.theses.fr/2017LYSE1176

Texas A&M University

5. Sung, Je Sang. Generalized Domination in Graphs with Applications in Wireless Networks.

Degree: PhD, Industrial Engineering, 2013, Texas A&M University

URL: http://hdl.handle.net/1969.1/151958

► The objective of this research is to study practical generalization of domination in graphs and explore the theoretical and computational aspects of models arising in… (more)

▼ The objective of this research is to study practical generalization of domination in graphs and explore the theoretical and computational aspects of models arising in the design of wireless networks. For the construction of a virtual backbone of a wireless ad-hoc network, two different models are proposed concerning reliability and robustness. This dissertation also considers wireless sensor placement problems with various additional constraints that reflect different real-life scenarios. In wireless ad-hoc network, a connected dominating set (CDS) can be used to serve as a virtual backbone, facilitating communication among the members in the network. Most literature focuses on creating the smallest virtual backbone without considering the distance that a message has to travel from a source until it reaches its desired destination. However, recent research shows that the chance of loss of a message in transmission increases as the distance that the message has to travel increases. We propose CDS with bounded diameter, called dominating s-club (DsC) for s ≥ 1, to model a reliable virtual backbone. An ideal virtual backbone should retain its structure after the failure of a certain number of vertices. The issue of robustness under vertex failure is considered by studying k-connected m-dominating set. We describe several structural properties that hold form ≥ k, but fail when m < k. Three different formulations based on vertex-cut inequalities are shown depending on the value of k and m. The computational results show that the proposed lazy-constraint approach compares favorably with existing methods for the minimum connected dominating set problem (for k = m = 1). The experimental results for k = m = 2, 3, 4 are presented as well. In the wireless sensor placement problem, the objective is often to place a minimum number of sensors while monitoring all sites of interest, and this can be modeled by dominating set. In some practical situations, however, there could be a location where a sensor cannot be placed because of environmental restrictions. Motivated by these practical scenarios, we introduce varieties of dominating set and the corresponding optimization problems. For these new problems, we consider the computational complexity, mathematical programming formulation, and analytical bounds on the size of structures of interest. We solve these problems using a general commercial solver and compare its performance with that of simulated annealing. Advisors/Committee Members: Butenko, Sergiy (advisor), Banerjee, Amarnath (committee member), Kianfar, Kiavash (committee member), Sivakumar, Natarajan (committee member).

Subjects/Keywords: Dominating set; virtual backbone; k-connected m-dominating set; selective dominating set

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

APA (6^th Edition):

Sung, J. S. (2013). Generalized Domination in Graphs with Applications in Wireless Networks. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/151958

Chicago Manual of Style (16^th Edition):

Sung, Je Sang. “Generalized Domination in Graphs with Applications in Wireless Networks.” 2013. Doctoral Dissertation, Texas A&M University. Accessed March 07, 2021. http://hdl.handle.net/1969.1/151958.

MLA Handbook (7^th Edition):

Sung, Je Sang. “Generalized Domination in Graphs with Applications in Wireless Networks.” 2013. Web. 07 Mar 2021.

Vancouver:

Sung JS. Generalized Domination in Graphs with Applications in Wireless Networks. [Internet] [Doctoral dissertation]. Texas A&M University; 2013. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/1969.1/151958.

Council of Science Editors:

Sung JS. Generalized Domination in Graphs with Applications in Wireless Networks. [Doctoral Dissertation]. Texas A&M University; 2013. Available from: http://hdl.handle.net/1969.1/151958

University of Houston

6. Zhang, Lan 1985-. NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH.

Degree: PhD, Mathematics, 2014, University of Houston

URL: http://hdl.handle.net/10657/1683

► In this dissertation, we present numerical schemes in simulating immiscible two-phase flow problems. The goal of this work is to find unified solutions for numerical… (more)

Subjects/Keywords: Two-phase flow; Level Set method

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

APA (6^th Edition):

Zhang, L. 1. (2014). NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH. (Doctoral Dissertation). University of Houston. Retrieved from http://hdl.handle.net/10657/1683

Chicago Manual of Style (16^th Edition):

Zhang, Lan 1985-. “NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH.” 2014. Doctoral Dissertation, University of Houston. Accessed March 07, 2021. http://hdl.handle.net/10657/1683.

MLA Handbook (7^th Edition):

Zhang, Lan 1985-. “NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH.” 2014. Web. 07 Mar 2021.

Vancouver:

Zhang L1. NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH. [Internet] [Doctoral dissertation]. University of Houston; 2014. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10657/1683.

Council of Science Editors:

Zhang L1. NUMERICAL SIMULATION OF TWO-PHASE FLOW USING THE LEVEL SET APPROACH. [Doctoral Dissertation]. University of Houston; 2014. Available from: http://hdl.handle.net/10657/1683

Princeton University

7. Beltrani, Vincent Joseph. Exploring Quantum Control Landscapes .

Degree: PhD, 2012, Princeton University

URL: http://arks.princeton.edu/ark:/88435/dsp0137720c756

► Recent developments in the fields of ultrashort pulse generation, frequency-based pulse shaping techniques, and evolutionary machine learning algorithms have made it possible to control chemical… (more)

▼ Recent developments in the fields of ultrashort pulse generation, frequency-based pulse shaping techniques, and evolutionary machine learning algorithms have made it possible to control chemical phenomena at the molecular scale. The unexpected ease of finding successful controls in the laboratory has been ascribed to the favorable topology and structure of the control landscape, which is the physical observable defined as a function of the control variables. In this regard, a set of so called D-MORPH homotopy algorithms for landscape explorations are presented within this work. The first-order D-MORPH algorithm explores control level sets that exist away from the landscape top and bottom. The algorithm also has the ability to climb to the landscape top in order to identify controls producing perfect yields. The second-order D-MORPH algorithm operates to explore the level sets at the landscape top and bottom, which is especially important as these locations have particular physical relevance – the top is the most desired location while at the bottom the goal is to climb away as rapidly as possible. At the top, an attractive control is one that consistently produces high yields even in the presence of some degree of noise. This work shows that a robustness criteria can be built into landscape explorations at the top in order to identify such controls. The Pareto D-MORPH algorithm is used to explore the trade-off between laser resources (e.g., bandwidth) and the ability to discriminate between similar systems. Within this work, the algorithm is geared toward detecting and differentiating between similar chemical species. Finally, many sections of this work address the notion that chemical or material composition itself can be exploited as controls. From this perspective the goal of property optimization in chemistry or material science can be viewed in a control context, and Hamiltonian structure controls may be optimized by drawing on the chemical `stockroom'. The D-MORPH algorithms are extended to the case of dual controls (i.e., field and Hamiltonian structure together) and the freedom is shown to offer prospects for new and exciting control applications. Advisors/Committee Members: Rabitz, Herschel (advisor).

Subjects/Keywords: coherent; control; feedback; landscape; level set; quantum

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APA (6^th Edition):

Beltrani, V. J. (2012). Exploring Quantum Control Landscapes . (Doctoral Dissertation). Princeton University. Retrieved from http://arks.princeton.edu/ark:/88435/dsp0137720c756

Chicago Manual of Style (16^th Edition):

Beltrani, Vincent Joseph. “Exploring Quantum Control Landscapes .” 2012. Doctoral Dissertation, Princeton University. Accessed March 07, 2021. http://arks.princeton.edu/ark:/88435/dsp0137720c756.

MLA Handbook (7^th Edition):

Beltrani, Vincent Joseph. “Exploring Quantum Control Landscapes .” 2012. Web. 07 Mar 2021.

Vancouver:

Beltrani VJ. Exploring Quantum Control Landscapes . [Internet] [Doctoral dissertation]. Princeton University; 2012. [cited 2021 Mar 07]. Available from: http://arks.princeton.edu/ark:/88435/dsp0137720c756.

Council of Science Editors:

Beltrani VJ. Exploring Quantum Control Landscapes . [Doctoral Dissertation]. Princeton University; 2012. Available from: http://arks.princeton.edu/ark:/88435/dsp0137720c756

King Abdullah University of Science and Technology

8. Williams-Rioux, Bertrand. Level Set Projection Method for Incompressible Navier-Stokes on Arbitrary Boundaries.

Degree: Biological and Environmental Sciences and Engineering (BESE) Division, 2012, King Abdullah University of Science and Technology

URL: http://hdl.handle.net/10754/209429

► Second order level set projection method for incompressible Navier-Stokes equations is proposed to solve flow around arbitrary geometries. We used rectilinear grid with collocated cell… (more)

Subjects/Keywords: level set; projection; incompressible; multigrid; navier-stokes

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APA (6^th Edition):

Williams-Rioux, B. (2012). Level Set Projection Method for Incompressible Navier-Stokes on Arbitrary Boundaries. (Thesis). King Abdullah University of Science and Technology. Retrieved from http://hdl.handle.net/10754/209429

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

Chicago Manual of Style (16^th Edition):

Williams-Rioux, Bertrand. “Level Set Projection Method for Incompressible Navier-Stokes on Arbitrary Boundaries.” 2012. Thesis, King Abdullah University of Science and Technology. Accessed March 07, 2021. http://hdl.handle.net/10754/209429.

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

MLA Handbook (7^th Edition):

Williams-Rioux, Bertrand. “Level Set Projection Method for Incompressible Navier-Stokes on Arbitrary Boundaries.” 2012. Web. 07 Mar 2021.

Vancouver:

Williams-Rioux B. Level Set Projection Method for Incompressible Navier-Stokes on Arbitrary Boundaries. [Internet] [Thesis]. King Abdullah University of Science and Technology; 2012. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10754/209429.

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

Council of Science Editors:

Williams-Rioux B. Level Set Projection Method for Incompressible Navier-Stokes on Arbitrary Boundaries. [Thesis]. King Abdullah University of Science and Technology; 2012. Available from: http://hdl.handle.net/10754/209429

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

Penn State University

9. Raic, Zeljko. Cerebrospinal Fluid and Brain Tissue Segmentation in Hydrocephalic Patients via Three Dimensional Level Set Method.

Degree: 2013, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/19984

► Volume segmentation of medical image data shows great promise in assisting physicians with diagnosis and treatment. This thesis applies an automated level set method in… (more)

Subjects/Keywords: 3D level set; hydrocephalus; volume segmentation; medical image segmentation; level set method

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APA (6^th Edition):

Raic, Z. (2013). Cerebrospinal Fluid and Brain Tissue Segmentation in Hydrocephalic Patients via Three Dimensional Level Set Method. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/19984

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

Chicago Manual of Style (16^th Edition):

Raic, Zeljko. “Cerebrospinal Fluid and Brain Tissue Segmentation in Hydrocephalic Patients via Three Dimensional Level Set Method.” 2013. Thesis, Penn State University. Accessed March 07, 2021. https://submit-etda.libraries.psu.edu/catalog/19984.

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

MLA Handbook (7^th Edition):

Raic, Zeljko. “Cerebrospinal Fluid and Brain Tissue Segmentation in Hydrocephalic Patients via Three Dimensional Level Set Method.” 2013. Web. 07 Mar 2021.

Vancouver:

Raic Z. Cerebrospinal Fluid and Brain Tissue Segmentation in Hydrocephalic Patients via Three Dimensional Level Set Method. [Internet] [Thesis]. Penn State University; 2013. [cited 2021 Mar 07]. Available from: https://submit-etda.libraries.psu.edu/catalog/19984.

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

Council of Science Editors:

Raic Z. Cerebrospinal Fluid and Brain Tissue Segmentation in Hydrocephalic Patients via Three Dimensional Level Set Method. [Thesis]. Penn State University; 2013. Available from: https://submit-etda.libraries.psu.edu/catalog/19984

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

Université de Bordeaux I

10. Voronetska, Kateryna. Simulation numérique directe des écoulements à phases dispersées : Contribution of effect directed analysis approach to the identification of endocrine disrupting chemicals in aquatic systems.

Degree: Docteur es, Mécanique et ingénierie, 2012, Université de Bordeaux I

URL: http://www.theses.fr/2012BOR14507

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Dans l'industrie du pétrole et des moteurs, les écoulements de fluides non-miscibles sont fréquemment rencontrés : écoulements d'hydrocarbures dans les conduites, séparation en production, injection… (more)

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Dans l'industrie du pétrole et des moteurs, les écoulements de fluides non-miscibles sont fréquemment rencontrés : écoulements d'hydrocarbures dans les conduites, séparation en production, injection de carburant dans les moteurs, procédés de raffinage, etc.Pour modéliser ce type d'écoulement, deux approches sont possibles. Soit l'écoulement est décrit de façon macroscopique et les phénomènes locaux (rupture et coalescence des gouttes, glissement des phases, compaction locale, etc.) sont modélisés à l'aide de lois de fermeture analytiques ou empiriques. Soit l'écoulement est modélisé de manière directe à l'échelle de la goutte et on s'attache à décrire précisément l'interface et les interactions entre les phases. C'est cette dernière approche que nous avons proposé d'adopter pour étudier des écoulements à phase dispersée liquide-liquide, et plus particulièrement les phénomènes de rupture et coalescence, collision ou déformation de gouttes. Ainsi, le but principal de ce travail de thèse a été le développement d'un code de simulation numérique directe capable de modéliser un écoulement diphasique liquide-liquide, afin d'étudier en détail les effets de coalescence et de rupture entre les gouttes. Ce travail a nécessité l’utilisation d’une technique de suivi d’interface appropriée et le développement d’un solveur des équations de Navier-Stokes incompressible pour calculer le champ de vitesse, ainsi qu’une méthode de couplage entre ces deux solveurs pour la simulation des écoulements diphasiques. Notre outil numérique a été validé sur de nombreux cas tests académiques et appliqué à l'étude du processus de séparation liquide-liquide.

The flow of immiscible fluids is a frequent issue in the petroleum industry: hydrocarbon in pipelines, separation process for production, fuel injection in engines, refinery treatment processes, etc.There are two possible approaches to model this type of flow. In the first one, the flow is described macroscopically. In this case, local phenomena (breakage or coalescence of droplets, phase slip, local compaction) are modeled thanks to analytic closure laws or empiric laws. In the second approach, the flow is simulated indirectly on a scale of droplet and we want to describe precisely the interface and the interactions between phases. We propose here to consider the second method to study liquid/liquid dispersed flows and especially the phenomena of breakage or coalescence and collision or distortion of the droplets.Thus, the main purpose of this work was the development of a direct numerical simulation code that is capable to model a liquid-liquid two-phase flow, in order to study in detail the effects of droplets coalescence and breakage. To model a two-phase flow, it is necessary to choose an appropriate interface tracking method and to develop a solver for Navier-Stokes incompressible equations to compute the velocity and pressure values. Also, a coupling method that is able to handle the discontinuous quantities at the interface has to be implemented. Our numerical tool has been validated…

Advisors/Committee Members: Caltagirone, Jean-Paul (thesis director).

Subjects/Keywords: Suivi d'interface; Level-Set; Écoulement diphasique; Interface capturing; Level-Set; Two-phase flow

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

APA (6^th Edition):

Voronetska, K. (2012). Simulation numérique directe des écoulements à phases dispersées : Contribution of effect directed analysis approach to the identification of endocrine disrupting chemicals in aquatic systems. (Doctoral Dissertation). Université de Bordeaux I. Retrieved from http://www.theses.fr/2012BOR14507

Chicago Manual of Style (16^th Edition):

Voronetska, Kateryna. “Simulation numérique directe des écoulements à phases dispersées : Contribution of effect directed analysis approach to the identification of endocrine disrupting chemicals in aquatic systems.” 2012. Doctoral Dissertation, Université de Bordeaux I. Accessed March 07, 2021. http://www.theses.fr/2012BOR14507.

MLA Handbook (7^th Edition):

Voronetska, Kateryna. “Simulation numérique directe des écoulements à phases dispersées : Contribution of effect directed analysis approach to the identification of endocrine disrupting chemicals in aquatic systems.” 2012. Web. 07 Mar 2021.

Vancouver:

Voronetska K. Simulation numérique directe des écoulements à phases dispersées : Contribution of effect directed analysis approach to the identification of endocrine disrupting chemicals in aquatic systems. [Internet] [Doctoral dissertation]. Université de Bordeaux I; 2012. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2012BOR14507.

Council of Science Editors:

Voronetska K. Simulation numérique directe des écoulements à phases dispersées : Contribution of effect directed analysis approach to the identification of endocrine disrupting chemicals in aquatic systems. [Doctoral Dissertation]. Université de Bordeaux I; 2012. Available from: http://www.theses.fr/2012BOR14507

11. Al Moussawi, Ali. Reconstruction 3D de vaisseaux sanguins : 3D reconstruction of blood vessels.

Degree: Docteur es, Mathématiques appliquées, 2014, Toulon

URL: http://www.theses.fr/2014TOUL0014

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Ce travail concerne la reconstruction 3D de vaisseaux sanguins à partir de coupes transversales en nombre éventuellement réduit. Si des données sont manquantes, une reconstruction… (more)

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Ce travail concerne la reconstruction 3D de vaisseaux sanguins à partir de coupes transversales en nombre éventuellement réduit. Si des données sont manquantes, une reconstruction cohérente avec un réseau de vaisseaux est obtenue. Cette approche permet en outre de limiter les interventions humaines lors du traitement des images des coupes transversales 2D. Sachant que les images utilisées sont obtenues par scanner,la difficulté est de connecter les vaisseaux sanguins entre deux coupes espacées pour obtenir un graphe qui correspond au cœur des vaisseaux. En associant les vaisseaux sanguins sur les coupes à des masses à transporter, on construit un graphe solution d’un problème de transport ramifié. La reconstruction 3D de la géométrie résulte des données 2D d’imagerie issues des différentes coupes transversales et du graphe. La géométrie 3D des vaisseaux sanguins est représentée par la donnée d’une fonction Level Set définie en tout point de l’espace dont l’iso-valeur zéro correspond aux parois des vaisseaux. On s’intéresse ensuite à résoudre numériquement le modèle de Navier-Stokes en écoulement incompressible sur un maillage cartésien inclus dans la géométrie reconstruite. Ce choix est motivé par la rapidité d’assemblage du maillage et des opérateurs discrets de dérivation, en vue d’éventuelles déformation des vaisseaux. L’inadaptation du maillage avec l’interface de la géométrie amène à considérer une condition limite modifiée permettant un calcul consistant des contraintes aux parois.

This work concerns the 3D reconstruction of blood vessels from a limited number of 2D transversal cuts obtained from scanners. If data are missing, a coherentreconstruction with a vessel network is obtained. This approach allows to limit human interventions in processing images of 2D transversal cuts. Knowing that the images used are obtained by scanner, the difficulty is to connect the blood vessels between some widely spaced cuts in order to produce the graph corresponding to the network of vessels. We identify the vessels on each trnasversal cut as a mass to be transported, we construct a graph solution of a branched transport problem. At this stage, we are able to reconstruct the 3D geometry by using the 2D Level Set Functions given by the transversal cuts and the graph information. The 3D geometry of blood vessels is represented by the data of the Level Set function defined at any point of the space whose 0-level corresponds to the vessel walls. The resulting geometry is usually integrated in a fluid mechanic code solving the incompressible Navier-Stokes equations on a Cartesian grid strictly included in a reconstructed geometry. The inadequacy of the mesh with the interface of the geometry is overcomed thanks to a modified boundary condition leading to an accurate computation of the constraints to the walls.

Advisors/Committee Members: Galusinski, Cédric (thesis director).

Subjects/Keywords: Transport branché; Fonction level set; Reconstruction 3D; Branching transportation; Level set function; 3D reconstruction

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

APA (6^th Edition):

Al Moussawi, A. (2014). Reconstruction 3D de vaisseaux sanguins : 3D reconstruction of blood vessels. (Doctoral Dissertation). Toulon. Retrieved from http://www.theses.fr/2014TOUL0014

Chicago Manual of Style (16^th Edition):

Al Moussawi, Ali. “Reconstruction 3D de vaisseaux sanguins : 3D reconstruction of blood vessels.” 2014. Doctoral Dissertation, Toulon. Accessed March 07, 2021. http://www.theses.fr/2014TOUL0014.

MLA Handbook (7^th Edition):

Al Moussawi, Ali. “Reconstruction 3D de vaisseaux sanguins : 3D reconstruction of blood vessels.” 2014. Web. 07 Mar 2021.

Vancouver:

Al Moussawi A. Reconstruction 3D de vaisseaux sanguins : 3D reconstruction of blood vessels. [Internet] [Doctoral dissertation]. Toulon; 2014. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2014TOUL0014.

Council of Science Editors:

Al Moussawi A. Reconstruction 3D de vaisseaux sanguins : 3D reconstruction of blood vessels. [Doctoral Dissertation]. Toulon; 2014. Available from: http://www.theses.fr/2014TOUL0014

12. Zhao, Jiaxin. Génération de maillage à partir d'images 3D en utilisant l'adaptation de maillage anisotrope et une équation de réinitialisation : Direct multiphase mesh generation from 3D images using anisotropic mesh adaptation and a redistancing equation.

Degree: Docteur es, Mécanique numérique et Matériaux, 2016, Paris Sciences et Lettres (ComUE)

URL: http://www.theses.fr/2016PSLEM004

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Ces dernières années, les techniques d'imagerie ont fait l'objet de beaucoup d'améliorations. Elles permettent de fournir des images numériques 2D ou 3D précises de zones… (more)

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Ces dernières années, les techniques d'imagerie ont fait l'objet de beaucoup d'améliorations. Elles permettent de fournir des images numériques 2D ou 3D précises de zones parfois invisibles à l’œil nu. Ces techniques s'appliquent dans de nombreux domaines comme l'industrie cinématographique, la photographie ou l'imagerie médicale... Dans cette thèse, l'imagerie sera utilisée pour effectuer des simulations numériques en la couplant avec un solveur éléments finis. Nous présenterons, en premier lieu, la morphologie mathématique et la méthode d'immersion d'image. Elles permettront l'extraction d'informations permettant la transformation d'une image dans un maillage exploitable. Puis, une méthode itérative d'adaptation de maillage basée sur un estimateur d'erreur sera utilisée afin de construire un maillage optimal. Ainsi, un maillage sera construit uniquement avec les données d'une image. Nous proposerons également une nouvelle méthodologie pour construire une fonction régulière a l'aide d'une méthode de réinitialisation de la distance signée. Deux avantages sont à noter : l'utilisation de la fonction régularisée permet une bonne adaptation de maillage. De plus, elle est directement utilisable par le solveur éléments finis. Les simulations numériques sont donc réalisées en couplant éléments finis stabilisés, adaptation de maillage anisotrope et réinitialisation. L'objectif de cette thèse est donc de simplifier le calcul numérique à partir d'image, d'améliorer la précision numérique, la construction d'un maillage automatique et de réaliser des calculs numériques parallèles efficaces. Les applications envisagées peuvent être dans le domaine médical, de la physique des matériaux ou du design industriel.

Imaging techniques have well improved in the last decades. They may accurately provide numerical descriptions from 2D or 3D images, opening perspectives towards inner information, not seen otherwise, with applications in different fields, like medicine studies, material science or urban environments. In this work, a technique to build a numerical description under the mesh format has been implemented and used in numerical simulations when coupled to finite element solvers. Firstly, mathematical morphology techniques have been introduced to handle image information, providing the specific features of interest for the simulation. The immersed image method was then proposed to interpolate the image information on a mesh. Then, an iterative anisotropic mesh adaptation operator was developed to construct the optimal mesh, based on the estimated error concerning the image interpolation. The mesh is thus directly constructed from the image information. We have also proposed a new methodology to build a regularized phase function, corresponding to the objects we wish to distinguish from the image, using a redistancing method. Two main advantages of having such function are: the gradient of the regularized function performs better for mesh adaptation; the regularized function may be directly used for the finite element solver.…

Advisors/Committee Members: Coupez, Thierry (thesis director), Rocha da Silva, Luisa Alexandra (thesis director).

Subjects/Keywords: Adaptation de maillage; Fonction Level-Set; Réinitialisation; Mesh adaptation; Level-Set Function; Redistancing; 004.015

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

APA (6^th Edition):

Zhao, J. (2016). Génération de maillage à partir d'images 3D en utilisant l'adaptation de maillage anisotrope et une équation de réinitialisation : Direct multiphase mesh generation from 3D images using anisotropic mesh adaptation and a redistancing equation. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2016PSLEM004

Chicago Manual of Style (16^th Edition):

Zhao, Jiaxin. “Génération de maillage à partir d'images 3D en utilisant l'adaptation de maillage anisotrope et une équation de réinitialisation : Direct multiphase mesh generation from 3D images using anisotropic mesh adaptation and a redistancing equation.” 2016. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed March 07, 2021. http://www.theses.fr/2016PSLEM004.

MLA Handbook (7^th Edition):

Zhao, Jiaxin. “Génération de maillage à partir d'images 3D en utilisant l'adaptation de maillage anisotrope et une équation de réinitialisation : Direct multiphase mesh generation from 3D images using anisotropic mesh adaptation and a redistancing equation.” 2016. Web. 07 Mar 2021.

Vancouver:

Zhao J. Génération de maillage à partir d'images 3D en utilisant l'adaptation de maillage anisotrope et une équation de réinitialisation : Direct multiphase mesh generation from 3D images using anisotropic mesh adaptation and a redistancing equation. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2016. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2016PSLEM004.

Council of Science Editors:

Zhao J. Génération de maillage à partir d'images 3D en utilisant l'adaptation de maillage anisotrope et une équation de réinitialisation : Direct multiphase mesh generation from 3D images using anisotropic mesh adaptation and a redistancing equation. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2016. Available from: http://www.theses.fr/2016PSLEM004

Brno University of Technology

13. Yerpeissov, Serik. Automatická segmentace medicínských dat s pomocí algoritmu Level Set: Automatic medical image segmentation using Level Set algorithm.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/41770

► This thesis contains two main parts, theoretical and implementation. In the theoretical part, there are described the different segmentation methods. Mainly it is about description… (more)

Subjects/Keywords: Level set; Java; ImageJ; Segmentace; Eclipse; Level set; Java; ImageJ; Segmentation; Eclipse

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

APA (6^th Edition):

Yerpeissov, S. (2019). Automatická segmentace medicínských dat s pomocí algoritmu Level Set: Automatic medical image segmentation using Level Set algorithm. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/41770

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

Chicago Manual of Style (16^th Edition):

Yerpeissov, Serik. “Automatická segmentace medicínských dat s pomocí algoritmu Level Set: Automatic medical image segmentation using Level Set algorithm.” 2019. Thesis, Brno University of Technology. Accessed March 07, 2021. http://hdl.handle.net/11012/41770.

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

MLA Handbook (7^th Edition):

Yerpeissov, Serik. “Automatická segmentace medicínských dat s pomocí algoritmu Level Set: Automatic medical image segmentation using Level Set algorithm.” 2019. Web. 07 Mar 2021.

Vancouver:

Yerpeissov S. Automatická segmentace medicínských dat s pomocí algoritmu Level Set: Automatic medical image segmentation using Level Set algorithm. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11012/41770.

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

Council of Science Editors:

Yerpeissov S. Automatická segmentace medicínských dat s pomocí algoritmu Level Set: Automatic medical image segmentation using Level Set algorithm. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/41770

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

Brno University of Technology

14. Románek, Jakub. Metody segmentace biomedicínských obrazových signálů v Javě: Methods for biomedical image signal segmentation in Java.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/9038

► This thesis contains two main parts, theoretical and implementation. In the theoretical part, there are described the different segmentation methods. Mainly it is about description… (more)

Subjects/Keywords: Level set; Java; ImageJ; Segmentace; Swing; Eclipse; Level set; Java; ImageJ; Segmentation; Swing; Eclipse

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

APA (6^th Edition):

Románek, J. (2018). Metody segmentace biomedicínských obrazových signálů v Javě: Methods for biomedical image signal segmentation in Java. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/9038

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

Chicago Manual of Style (16^th Edition):

Románek, Jakub. “Metody segmentace biomedicínských obrazových signálů v Javě: Methods for biomedical image signal segmentation in Java.” 2018. Thesis, Brno University of Technology. Accessed March 07, 2021. http://hdl.handle.net/11012/9038.

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

MLA Handbook (7^th Edition):

Románek, Jakub. “Metody segmentace biomedicínských obrazových signálů v Javě: Methods for biomedical image signal segmentation in Java.” 2018. Web. 07 Mar 2021.

Vancouver:

Románek J. Metody segmentace biomedicínských obrazových signálů v Javě: Methods for biomedical image signal segmentation in Java. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11012/9038.

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

Council of Science Editors:

Románek J. Metody segmentace biomedicínských obrazových signálů v Javě: Methods for biomedical image signal segmentation in Java. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/9038

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

University of Waterloo

15. Honke, Michael. Simulation of the Ferrofluid Interface.

Degree: 2020, University of Waterloo

URL: http://hdl.handle.net/10012/15859

► Ferrofluids were initially invented as an additive for rocket fuels. The commercial applications of ferrofluids have since expanded, and have become popularized as desktop toys… (more)

▼ Ferrofluids were initially invented as an additive for rocket fuels. The commercial applications of ferrofluids have since expanded, and have become popularized as desktop toys as well as an art form. Since 1987, ferrofluid simulations have been developed for engineering and physics applications. The Rosensweig instability, a visually appealing behaviour of ferrofluids, has been one of the focuses for ferrofluid simulation. While some simulations were successful, they have either placed restrictive assumptions on the problem, used non-physical models, or failed to reproduce this phenomenon due to high computational expense. One recent exception was a concurrent work from 2019 by Huang et al. that used a particle based fluid simulation method. They successfully reproduced this phenomenon without these issues, but adopted a different computational approach. We present a methodology for simulating ferrofluid with its accompanying Rosensweig instability using finite difference schemes within a grid based simulation. This is the first simulator to use a grid based methodology to approximately reproduce the Rosensweig instability. After Huang et al., our simulator is the second to approximately reproduce the Rosensweig instability with a nonrestrictive physically faithful model. The simulator accommodates any magnetic field and initial configuration of the fluid. Due to the high level of interface detail required by the Rosensweig instability we developed improved curvature estimation and surface tracking methods. We use a normal-aligned height function curvature stencil paired with a modified version of the particle level set. Instead of using particles for error detection, they are directly seeded on the interface to track it. These particles can then be used directly to determine the interface location for curvature estimation. The new particle level set is also able run on a GPU for a twenty to thirty times performance improvement compared to its CPU counterpart. This coupling of methods produces curvature estimates that are two to five times more accurate than when operating independently of each other. After verifying the curvature and surface tracking methods, the ferrofluid simulator is demonstrated by inducing motion into a ferrofluid droplet using an applied magnetic field. Lastly, the Rosensweig instability is produced for a pool of ferrofluid sitting in a dish above a dipole magnet.

Subjects/Keywords: ferrofluids; simulation; magnetism; interface; surface tracking; Rosensweig instability; normal field instability; curvature measurement; curvature estimation; fluid simulation; particle level set; level set; direct particle level set

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

APA (6^th Edition):

Honke, M. (2020). Simulation of the Ferrofluid Interface. (Thesis). University of Waterloo. Retrieved from http://hdl.handle.net/10012/15859

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

Chicago Manual of Style (16^th Edition):

Honke, Michael. “Simulation of the Ferrofluid Interface.” 2020. Thesis, University of Waterloo. Accessed March 07, 2021. http://hdl.handle.net/10012/15859.

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

MLA Handbook (7^th Edition):

Honke, Michael. “Simulation of the Ferrofluid Interface.” 2020. Web. 07 Mar 2021.

Vancouver:

Honke M. Simulation of the Ferrofluid Interface. [Internet] [Thesis]. University of Waterloo; 2020. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10012/15859.

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

Council of Science Editors:

Honke M. Simulation of the Ferrofluid Interface. [Thesis]. University of Waterloo; 2020. Available from: http://hdl.handle.net/10012/15859

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

16. Vitorio Junior, Paulo Cezar. Análise Level Set da otimização topológica de estruturas planas utilizando o Método dos Elementos de Contorno.

Degree: Mestrado, Estruturas, 2014, University of São Paulo

URL: http://www.teses.usp.br/teses/disponiveis/18/18134/tde-24092014-150115/ ;

►

A otimização topológica de estruturas está relacionada à concepção de projetos que executem suas funções com nível de segurança adequado empregando a quantidade mínima de… (more)

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A otimização topológica de estruturas está relacionada à concepção de projetos que executem suas funções com nível de segurança adequado empregando a quantidade mínima de material. Neste trabalho, determina-se a geometria ótima de estruturas planas por meio do acoplamento do Método dos Elementos de Contorno (MEC) ao Método Level Set (MLS). O algoritmo é composto por 3 etapas: problema mecânico, otimização topológica e reconstrução da estrutura. O problema mecânico é resolvido pelas equações algébricas do MEC. A otimização topológica é determinada pelo MLS, este representa a geometria do corpo e suas evoluções por meio da função Level Set (LS) avaliada em seu nível zero. Na reconstrução realiza-se o remalhamento, pois a cada iteração a estrutura é modificada. O acoplamento proposto resulta na geometria ótima da estrutura sem a necessidade da aplicação de filtros. Os exemplos analisados mostram que algoritmo desenvolvido capta adequadamente a geometria ótima das estruturas. Com esse trabalho, avança-se no campo das aplicações do acoplamento MEC-MLS e no desenvolvimento de soluções inovadoras para problemas complexos de engenharia.

In general, the topological optimization of structures is related to design projects that perform their functions with appropriate security levels using the minimum amount of material. This research determines the optimal geometry of 2D structures by coupling the Boundary Blement Method (BEM) to Level Set Method (LSM). The algorithm consists of 3 steps: mechanical model, topology optimization and structure reconstruction. The mechanical model is solved by BEM algebraic equations. The topology optimization is determined using the MLS, the geometry of the body is determined by the Level Set (LS) function evaluated at the zero level. The reconstruction achieves the remeshing, because for each iteration of the structure is modified. The proposed coupling results in the optimal geometry of the structure without the filters application. The examples show that the algorithm developed captures adequately the optimal geometry of the structures. With this dissertation, it is possible advance in the field of applications of the BEM - LSM and develop innovative solutions to complex engineering problems.

Advisors/Committee Members: Leonel, Edson Denner.

Subjects/Keywords: Boundary Element Method; Level Set method; Método dos Elementos de Contorno; Método Level Set; Otimização topológica; Topology optimization

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

APA (6^th Edition):

Vitorio Junior, P. C. (2014). Análise Level Set da otimização topológica de estruturas planas utilizando o Método dos Elementos de Contorno. (Masters Thesis). University of São Paulo. Retrieved from http://www.teses.usp.br/teses/disponiveis/18/18134/tde-24092014-150115/ ;

Chicago Manual of Style (16^th Edition):

Vitorio Junior, Paulo Cezar. “Análise Level Set da otimização topológica de estruturas planas utilizando o Método dos Elementos de Contorno.” 2014. Masters Thesis, University of São Paulo. Accessed March 07, 2021. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-24092014-150115/ ;.

MLA Handbook (7^th Edition):

Vitorio Junior, Paulo Cezar. “Análise Level Set da otimização topológica de estruturas planas utilizando o Método dos Elementos de Contorno.” 2014. Web. 07 Mar 2021.

Vancouver:

Vitorio Junior PC. Análise Level Set da otimização topológica de estruturas planas utilizando o Método dos Elementos de Contorno. [Internet] [Masters thesis]. University of São Paulo; 2014. [cited 2021 Mar 07]. Available from: http://www.teses.usp.br/teses/disponiveis/18/18134/tde-24092014-150115/ ;.

Council of Science Editors:

Vitorio Junior PC. Análise Level Set da otimização topológica de estruturas planas utilizando o Método dos Elementos de Contorno. [Masters Thesis]. University of São Paulo; 2014. Available from: http://www.teses.usp.br/teses/disponiveis/18/18134/tde-24092014-150115/ ;

17. Jedouaa, Meriem. Une méthode efficace de capture d'interface pour la simulation de suspensions d'objets rigides et de vésicules immergées dans un fluide : An efficient interface capturing method to simulate dense suspensions of rigid bodies and vesicles immersed in a fluid.

Degree: Docteur es, Mathématiques Appliquées, 2017, Grenoble Alpes

URL: http://www.theses.fr/2017GREAM042

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Dans ce travail, nous nous sommes intéressés à la simulation numérique de suspensions denses d'objets immergés dans un fluide. En s'inspirant d'une méthode de segmentation… (more)

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Dans ce travail, nous nous sommes intéressés à la simulation numérique de suspensions denses d'objets immergés dans un fluide. En s'inspirant d'une méthode de segmentation d'image, nous avons développé une méthode efficace de capture d'interface permettant d'une part de localiser les structures immergées et d'autre part de gérer les contacts numériques entre les structures.Le domaine fluide/structure est représenté à l'aide de trois fonctions labels et deux fonctions distances qui permettent de localiser chaque structure et son plus proche voisin.Les interfaces sont capturées par une seule fonction level set, celle-ci est ensuite transportée par la vitesse du fluide ou par la vitesse de chaque structure. Un algorithme de multi-label fast marching permet de réinitialiser à chaque pas de temps les fonctions labels et distances dans un périmètre proche des interfaces.La gestion des contacts numériques est effectuée grâce à une force répulsive à courte portée prenant en compte l'interaction entre les objets les plus proches.Dans un premier temps, la méthode est appliquée à l'évolution de solides rigides immergés.Un modèle de pénalisation global couplé aux fonctions labels permet de calculer en une seule fois l'ensemble des vitesses des structures rigides. Les résultats obtenus montrent l'efficacité de la méthode à gérer un grand nombre de solides.Nous avons ensuite appliqué la méthode des suspensions de vésicules immergées. Ce type de simulation requiert le calcul des forces élastiques et de courbures exercées sur les membranes. Grâce au modèle proposé, seulement une force élastique et une force de courbure sont calculées pour l'ensemble des membranes à l'aide de la fonction level set et des fonctions labels.

In this work, we propose a method to efficiently capture an arbitrary number of fluid/solid or fluid/fluid interfaces, in a level-set framework. This technique, borrowed from image analysis, is introduced in the context of the interaction of several bodies immersed in a fluid. A configuration of the bodies in the fluid/structure domain is described by three label maps providing the first and second neighbours, and their associated distance functions. Only one level set function captures the union of all interfaces and is transported with the fluid velocity or with a global velocity field which takes into account the velocity of each structure. A multi-label fast marching method is then performed in a narrow-band around the interfaces allowing to update the label and distance functions. Within this framework, the numerical treatment of contacts between the structures is achieved by a short-range repulsive force depending on the distance between the closest bodies.The method is validated through the simulation of a dense suspension of rigid bodies immersed in an incompressible fluid. A global penalization model uses the label maps to follow the solid bodies altogether without a separate computation of each body velocity. Consequently, the method shows its efficiency when dealing with a large number of rigid bodies.…

Advisors/Committee Members: Maitre, Emmanuel (thesis director), Bruneau, Charles-Henri (thesis director).

Subjects/Keywords: Interaction fluide/structure; Méthode level set; Modèle de collision; Fluid/structure interaction; Level set method; Multiple bodies; Collision model

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

APA (6^th Edition):

Jedouaa, M. (2017). Une méthode efficace de capture d'interface pour la simulation de suspensions d'objets rigides et de vésicules immergées dans un fluide : An efficient interface capturing method to simulate dense suspensions of rigid bodies and vesicles immersed in a fluid. (Doctoral Dissertation). Grenoble Alpes. Retrieved from http://www.theses.fr/2017GREAM042

Chicago Manual of Style (16^th Edition):

Jedouaa, Meriem. “Une méthode efficace de capture d'interface pour la simulation de suspensions d'objets rigides et de vésicules immergées dans un fluide : An efficient interface capturing method to simulate dense suspensions of rigid bodies and vesicles immersed in a fluid.” 2017. Doctoral Dissertation, Grenoble Alpes. Accessed March 07, 2021. http://www.theses.fr/2017GREAM042.

MLA Handbook (7^th Edition):

Jedouaa, Meriem. “Une méthode efficace de capture d'interface pour la simulation de suspensions d'objets rigides et de vésicules immergées dans un fluide : An efficient interface capturing method to simulate dense suspensions of rigid bodies and vesicles immersed in a fluid.” 2017. Web. 07 Mar 2021.

Vancouver:

Jedouaa M. Une méthode efficace de capture d'interface pour la simulation de suspensions d'objets rigides et de vésicules immergées dans un fluide : An efficient interface capturing method to simulate dense suspensions of rigid bodies and vesicles immersed in a fluid. [Internet] [Doctoral dissertation]. Grenoble Alpes; 2017. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2017GREAM042.

Council of Science Editors:

Jedouaa M. Une méthode efficace de capture d'interface pour la simulation de suspensions d'objets rigides et de vésicules immergées dans un fluide : An efficient interface capturing method to simulate dense suspensions of rigid bodies and vesicles immersed in a fluid. [Doctoral Dissertation]. Grenoble Alpes; 2017. Available from: http://www.theses.fr/2017GREAM042

18. Saad, Ali. Modélisation par level set des macroségrégations induites par le retrait à la solidification : Numerical Modelling of Macrosegregation Formed During Solidification With Shrinkage Using a Level Set Approach.

Degree: Docteur es, Sciences et génie des matériaux, 2016, Paris Sciences et Lettres (ComUE)

URL: http://www.theses.fr/2016PSLEM026

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La macroségrégation est un défaut connu dans les procédés de coulées industrielles. La genèse de ce défaut est la conséquence de l'interaction complexe entre la… (more)

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La macroségrégation est un défaut connu dans les procédés de coulées industrielles. La genèse de ce défaut est la conséquence de l'interaction complexe entre la microségrégation ou la distribution des espèces chimiques à l'échelle de la microstructure et les mouvements des phases liquide et solides. Les hétérogéneités de concentration en solutés à l'échelle de la pièce peuvent être rédhibitoires vis-à-vis de la qualité du produit.Dans ce travail, on propose un modèle numérique pour simuler et prédire la formation des macroségrégations en coeur des pièces d'alliages multi-constitués, induites par des variations thermiques et solutales dans la phase liquide. Dans un premier temps, on considère que le métal solidifie à volume constant. Dans ce contexte, la convection thermosolutale est étudiée ainsi que son influence sur la formation des canaux ségrégées à différentes échelles de modélisation. Dans un deuxième temps, le modèle vise à prédire les macroségrégations en présence de changement de volume du métal, dont la cause principale est le retrait à la solidification, pouvant être à l'origine du phénomène de ségrégation inverse. La surface entre le métal et le gaz environnant au cours du retrait évolue pendant le retrait en fonction du chemin de solidification qui varie avec la macroségrégation. Cette évolution d'interface est suivi par la méthode level set. Des prédictions de concentration moyenne, couplées aux bases de données thermodynamiques pour mieux prédire les chemins de solidification des alliages multi-constitués, sont analysées et comparées avec des résultats expérimentaux. Finalement, des calculs de solidification en microgravité sont présentées, simulant un essai expérimental dans le contexte du projet CCEMLCC lancé par l'Agence Spatiale Européenne. Les résultats en fin de solidification montrent un accord acceptable quant à la forme et l'élongation des échantillons solidifiés. Ces calculs sont faits avec des approximations binaire, ternaire et quaternaire d'une même nuance d'acier utilisée dans les essais en microgravité.

Macrosegregation is key defect in industrial casting processes. During solidification, solute redistribution at the scale of microstructure, also known as microsegregation, take place with complex interactions, in order to form one or more solid phases. These interactions between microsegregation and movements of liquid and solid phases may lead to macrosegregations. These solute heterogeneities spanning on a larger scale, may result in a bad casting quality. In this thesis, we propose a numerical model to simulate and predict macrosegregations occurring in the centre of multicomponent alloys, caused by thermal and solutal variations in the liquid phase. First, we assume that the metallic alloy solidifies with a constant volume. In this context, we study the influence of thermosolutal convection on the formation of channel segregations, at different modelling scales. The second part of this modelling work consider solidification while the metallic alloy's volume is decreasing, mainly…

Advisors/Committee Members: Gandin, Charles-André (thesis director), Bellet, Michel (thesis director).

Subjects/Keywords: Modélisation; Solidification; Ségrégation; Level set; Eléments finis; Métallurgie; Modelling; Solidification; Segregation; Level set; Finite elements; Metallurgy; 620.11

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

APA (6^th Edition):

Saad, A. (2016). Modélisation par level set des macroségrégations induites par le retrait à la solidification : Numerical Modelling of Macrosegregation Formed During Solidification With Shrinkage Using a Level Set Approach. (Doctoral Dissertation). Paris Sciences et Lettres (ComUE). Retrieved from http://www.theses.fr/2016PSLEM026

Chicago Manual of Style (16^th Edition):

Saad, Ali. “Modélisation par level set des macroségrégations induites par le retrait à la solidification : Numerical Modelling of Macrosegregation Formed During Solidification With Shrinkage Using a Level Set Approach.” 2016. Doctoral Dissertation, Paris Sciences et Lettres (ComUE). Accessed March 07, 2021. http://www.theses.fr/2016PSLEM026.

MLA Handbook (7^th Edition):

Saad, Ali. “Modélisation par level set des macroségrégations induites par le retrait à la solidification : Numerical Modelling of Macrosegregation Formed During Solidification With Shrinkage Using a Level Set Approach.” 2016. Web. 07 Mar 2021.

Vancouver:

Saad A. Modélisation par level set des macroségrégations induites par le retrait à la solidification : Numerical Modelling of Macrosegregation Formed During Solidification With Shrinkage Using a Level Set Approach. [Internet] [Doctoral dissertation]. Paris Sciences et Lettres (ComUE); 2016. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2016PSLEM026.

Council of Science Editors:

Saad A. Modélisation par level set des macroségrégations induites par le retrait à la solidification : Numerical Modelling of Macrosegregation Formed During Solidification With Shrinkage Using a Level Set Approach. [Doctoral Dissertation]. Paris Sciences et Lettres (ComUE); 2016. Available from: http://www.theses.fr/2016PSLEM026

Brno University of Technology

19. Janštová, Michaela. Segmentace kortikálních částí obratlů: Segmentation of cortical parts of vertebrae.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/68160

► This thesis deals with a segmentation of cortical parts of vertebrae from CT image datas in programming software called MATALB. Issues about segmentation techniques are… (more)

Subjects/Keywords: Segmentace; obratel; kortikální část; „level-set”; DRLSE; kontura; CT; Segmentation; vertebrae; cortical part; „level-set”; DRLSE; contour; CT

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

APA (6^th Edition):

Janštová, M. (2019). Segmentace kortikálních částí obratlů: Segmentation of cortical parts of vertebrae. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/68160

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

Chicago Manual of Style (16^th Edition):

Janštová, Michaela. “Segmentace kortikálních částí obratlů: Segmentation of cortical parts of vertebrae.” 2019. Thesis, Brno University of Technology. Accessed March 07, 2021. http://hdl.handle.net/11012/68160.

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

MLA Handbook (7^th Edition):

Janštová, Michaela. “Segmentace kortikálních částí obratlů: Segmentation of cortical parts of vertebrae.” 2019. Web. 07 Mar 2021.

Vancouver:

Janštová M. Segmentace kortikálních částí obratlů: Segmentation of cortical parts of vertebrae. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11012/68160.

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

Council of Science Editors:

Janštová M. Segmentace kortikálních částí obratlů: Segmentation of cortical parts of vertebrae. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/68160

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

Brno University of Technology

20. Rybnikář, Petr. Rešeršní studie metod rozpoznávání gest rukou snímaných kamerou: Retrieval study of hands gestures recognizing methods captured with camera.

Degree: 2019, Brno University of Technology

URL: http://hdl.handle.net/11012/176844

► The aim of this bachelor thesis was to get acquainted with basis methods of of image processing, which can be used for recognizing hands gestures… (more)

Subjects/Keywords: Detekce objektů; rozpoznávání; zpracování obrazu; level set; segmentace obrazu; MATLAB; Object detection; recognizing; image processing; level set; image segmentation; MATLAB

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

APA (6^th Edition):

Rybnikář, P. (2019). Rešeršní studie metod rozpoznávání gest rukou snímaných kamerou: Retrieval study of hands gestures recognizing methods captured with camera. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/176844

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

Chicago Manual of Style (16^th Edition):

Rybnikář, Petr. “Rešeršní studie metod rozpoznávání gest rukou snímaných kamerou: Retrieval study of hands gestures recognizing methods captured with camera.” 2019. Thesis, Brno University of Technology. Accessed March 07, 2021. http://hdl.handle.net/11012/176844.

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

MLA Handbook (7^th Edition):

Rybnikář, Petr. “Rešeršní studie metod rozpoznávání gest rukou snímaných kamerou: Retrieval study of hands gestures recognizing methods captured with camera.” 2019. Web. 07 Mar 2021.

Vancouver:

Rybnikář P. Rešeršní studie metod rozpoznávání gest rukou snímaných kamerou: Retrieval study of hands gestures recognizing methods captured with camera. [Internet] [Thesis]. Brno University of Technology; 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/11012/176844.

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

Council of Science Editors:

Rybnikář P. Rešeršní studie metod rozpoznávání gest rukou snímaných kamerou: Retrieval study of hands gestures recognizing methods captured with camera. [Thesis]. Brno University of Technology; 2019. Available from: http://hdl.handle.net/11012/176844

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

21. Jung, Yeonhee. An efficient analysis of resin transfer molding process using extended finite element method : Une analyse efficace du procédé RTM à l’aide de la méthode XFEM.

Degree: Docteur es, Mécanique et Ingénierie, 2013, Saint-Etienne, EMSE; Seoul National University

URL: http://www.theses.fr/2013EMSE0701

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Le procédé de fabrication par RTM (Resin Transfer Molding) a été étudié numériquement à l’aide de la méthode XFEM (eXtended Finite Element Method) combinée avec… (more)

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Le procédé de fabrication par RTM (Resin Transfer Molding) a été étudié numériquement à l’aide de la méthode XFEM (eXtended Finite Element Method) combinée avec la méthode Level set. La méthode XFEM permet d’obtenir une bonne précision numérique de la pression près du front d’écoulement, où son gradient est discontinu. Les fonctions de forme enrichies de la méthode XFEM sont proposées à l’aide des valeurs de Level set en vue de décrire correctement l’interpolation avec le front d’écoulement. En plus, la méthode de Level set est utilisée pour transporter le front d’écoulement à chaque pas de temps durant le remplissage du moule. Les valeurs de Level set sont calculées à l’aide d’une méthode de Galerkin implicite. Le solveur multi-frontal d’IPSAP a été utilisé pour la résolution du système. Cette étude a été validée en comparaison avec les solutions analytiques.En outre, une méthode de localisation avec XFEM et la méthode Level set a été proposée afin d’améliorer l’efficacité de calcul. Elle permet de réduire le domaine de calcul près du front d’écoulement. Par conséquent, le temps de calcul est fortement réduit grâce à cette méthode. Un test d’efficacité a été fait avec des modèles simples en écoulement laminaire ou radial.Quelques exemples d’application sont présentés pour illustrer la capacité de cette méthode. Une pale d’éolienne a également traitée comme application industrielle. Enfin, une interface d’utilisateur graphique a été développée en vue de fournir une facilité des pré- et post-processus.

Numerical simulation for Resin Transfer Molding (RTM) manufacturing process is attempted by using the eXtended Finite Element Method (XFEM) combined with the level set method. XFEM allows to obtaining a good numerical precision of the pressure near the resin flow front, where its gradient is discontinuous. The enriched shape functions of XFEM are derived by using the level set values so as to correctly describe the interpolation with the resin flow front. In addition, the level set method is used to transport the resin flow front at each time step during the mold filling. The level set values are calculated by an implicit characteristic Galerkin FEM. The multi-frontal solver of IPSAP is adopted to solve the system. This work is validated by comparing the obtained results with analytic solutions.Moreover, a localization method of XFEM and level set method is proposed to increase the computing efficiency. The computation domain is reduced to the small region near the resin flow front. Therefore, the total computing time is strongly reduced by it. The efficiency test is made with simple channel or radial flow models. Several application examples are analyzed to demonstrate ability of this method. A wind turbine blade is also treated as industrial application. Finally, a Graphic User Interface (GUI) tool is developed so as to make easy the pre/post-processing of the simulation.

Advisors/Committee Members: Han, Woo-Suck (thesis director), Kim, Seung Jo (thesis director).

Subjects/Keywords: Procédé RTM; XFEM; Level set; Simulation numérique; Méthode de localisation; RTM Process; XFEM; Level Set Method; Localization Method; Numerical Analysis

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

APA (6^th Edition):

Jung, Y. (2013). An efficient analysis of resin transfer molding process using extended finite element method : Une analyse efficace du procédé RTM à l’aide de la méthode XFEM. (Doctoral Dissertation). Saint-Etienne, EMSE; Seoul National University. Retrieved from http://www.theses.fr/2013EMSE0701

Chicago Manual of Style (16^th Edition):

Jung, Yeonhee. “An efficient analysis of resin transfer molding process using extended finite element method : Une analyse efficace du procédé RTM à l’aide de la méthode XFEM.” 2013. Doctoral Dissertation, Saint-Etienne, EMSE; Seoul National University. Accessed March 07, 2021. http://www.theses.fr/2013EMSE0701.

MLA Handbook (7^th Edition):

Jung, Yeonhee. “An efficient analysis of resin transfer molding process using extended finite element method : Une analyse efficace du procédé RTM à l’aide de la méthode XFEM.” 2013. Web. 07 Mar 2021.

Vancouver:

Jung Y. An efficient analysis of resin transfer molding process using extended finite element method : Une analyse efficace du procédé RTM à l’aide de la méthode XFEM. [Internet] [Doctoral dissertation]. Saint-Etienne, EMSE; Seoul National University; 2013. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2013EMSE0701.

Council of Science Editors:

Jung Y. An efficient analysis of resin transfer molding process using extended finite element method : Une analyse efficace du procédé RTM à l’aide de la méthode XFEM. [Doctoral Dissertation]. Saint-Etienne, EMSE; Seoul National University; 2013. Available from: http://www.theses.fr/2013EMSE0701

22. Karpouzas, Georgios. A hybrid method for shape and topology optimization in fluid mechanics.

Degree: 2019, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ)

URL: http://hdl.handle.net/10442/hedi/46428

► Adjoint optimisation is an exciting and fast growing research and application field in Computational Fluid Dynamics (CFD). It is widely used in shape, topology, flow… (more)

▼ Adjoint optimisation is an exciting and fast growing research and application field in Computational Fluid Dynamics (CFD). It is widely used in shape, topology, flow control, error estimation, inverse, and robust design optimisation problems. The present thesis focuses on the first two categories: shape and topology optimisation. The two methods in question historically have very distinct characteristics and, as a result of these differences, the usage of one or the other method may have clear advantages and/or disadvantages in the context of individual optimization problems. The method chosen for a specific optimisation problem can, thus, have distinct advantages over the other in terms of how much improvement in design can be practically achieved. Our ultimate aim is to overcome, to a significant extent, these limitations by hybridising the two methods.To achieve this end, it is necessary to understand both the strengths and weaknesses of the available methodologies and how they arise in the context of the optimisation system. First, the accuracy issue regarding the modelling of the solid regions in porositybased topology optimisation is examined and it is found that many of the problems relate to the lack of an exact interface between the solid and fluid regions. Extending the topology optimisation framework to incorporate a welldefined interface, using the levelset method, alleviates some of these problems. However, the correct implementation of nearwall turbulence modelling remains an issue. Using the volumeaveraged total pressure losses as an objective function, levelset based topology optimisation is used to optimize the design of: i) a rightangled duct; ii) a heating, ventilation, and airconditioning (HVAC) duct; iii) the inlet and outlet ducts of a gearpump; and iv) a cold air intake system (CAIS) of a car.In the second part of this thesis, a novel method called Generalised Internal Boundary (GIB) is derived, implemented and validated, which allows for the imposition of exact boundary conditions internal to the computational domain. This is achieved without changing the topology/connectivity of the computational mesh, which dramatically improves the algorithms’ performance.To realise their full potential, the new boundaries must be able to physically deform and move. However, transitioning elements over the interface from solid to fluid (and vice versa) introduces discontinuities in the timehistory of the solution fields. These timehistories are critical to the solution of governing equations incorporating timederivatives. Thus, it is necessary to reconstruct the old time values of the fields so they appear smooth, yet conservative, from the perspective of the conservation equations. In this context, an ArbitraryLagrangianEulerian (ALE) framework that incorporates the conservative reconstruction of old timefield values in the presence of strongly discontinuous cell transition events is proposed. The results of the proposed method were compared against the bodyfitted approach of the flow around a moving…

Subjects/Keywords: Συνεχής συζυγής μέθοδος; Μέθοδος level-Set; Γενικευμένα εσωτερικά όρια (GIB ); Continuous conjugation method; Level-Set method; GIB method

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

APA (6^th Edition):

Karpouzas, G. (2019). A hybrid method for shape and topology optimization in fluid mechanics. (Thesis). National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Retrieved from http://hdl.handle.net/10442/hedi/46428

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

Chicago Manual of Style (16^th Edition):

Karpouzas, Georgios. “A hybrid method for shape and topology optimization in fluid mechanics.” 2019. Thesis, National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ). Accessed March 07, 2021. http://hdl.handle.net/10442/hedi/46428.

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

MLA Handbook (7^th Edition):

Karpouzas, Georgios. “A hybrid method for shape and topology optimization in fluid mechanics.” 2019. Web. 07 Mar 2021.

Vancouver:

Karpouzas G. A hybrid method for shape and topology optimization in fluid mechanics. [Internet] [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2019. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10442/hedi/46428.

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

Council of Science Editors:

Karpouzas G. A hybrid method for shape and topology optimization in fluid mechanics. [Thesis]. National Technical University of Athens (NTUA); Εθνικό Μετσόβιο Πολυτεχνείο (ΕΜΠ); 2019. Available from: http://hdl.handle.net/10442/hedi/46428

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

INP Toulouse

23. El Itawi, Hassan. Crossing of a liquid-liquid interface by a droplet under centrifugal effect for a micro-encapsulation process : Traversée d'une interface liquide-liquide par une goutte sous l'effet centrifuge pour un procédé de micro-encapsulation.

Degree: Docteur es, Dynamique des fluides, 2020, INP Toulouse

URL: http://www.theses.fr/2020INPT0039

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Les applications concernées par la micro-encapsulation ne cessent de croître et couvrent des secteurs d’activités industrielles aussi variés que l’agriculture, la pharmacie, l'industrie alimentaire ou… (more)

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Les applications concernées par la micro-encapsulation ne cessent de croître et couvrent des secteurs d’activités industrielles aussi variés que l’agriculture, la pharmacie, l'industrie alimentaire ou encore la cosmétique. Ce travail s’inscrit dans le développement d’un procédé de micro-encapsulation basé sur des gouttes de taille submillimétrique traversant une interface liquide-liquide sous l’influence d’une force extérieure, ici la force centrifuge. L'objectif de ce travail est de comprendre les mécanismes hydrodynamiques et la dynamique des interfaces avant, pendant et après la traversée d'une interface liquide par une goutte, conduisant à son enrobage. Dans ce but, des approches numériques et expérimentales ont été combinées et complétées par des modèles théoriques. Une méthode numérique résout les équations de Navier-Stokes, discrétisées par une approche en volumes finis, en se basant sur les méthodes « Level-Set » et « Ghost Fluid » pour capturer la dynamique des interfaces en présence et gérer les discontinuités aux interfaces ; elle permet d’accéder au champ de vitesse autour de la goutte déformable lors de la traversée de l’interface. Un dispositif expérimental, permettant de former des gouttes aqueuses de tailles (100-1400 μm) et de forcer leur passage au travers d’une interface liquide grâce à une force centrifuge pouvant atteindre ≈ 2500g, a été conçu afin d’observer toutes les étapes du procédé grâce à une caméra rapide synchronisée avec la rotation de la cellule d'encapsulation, afin d’analyser les conditions de traversée et les différents régimes d’entraînement de fluide. La traversée ou le rebond d’une goutte à l’interface sont fonction de la compétition entre les forces interfaciales, le poids de la goutte et les forces inertielles, et relèvent de phénomènes complexes dépendant de nombreux paramètres adimensionnels. Les deux approches ont permis de définir les conditions de traversée en fonction des nombres adimensionnels pertinents ξ12ξ13 and Bo13, et de développer une loi d'échelle de la longueur maximale de la colonne se formant pendant la traversée ainsi que du volume d’enrobage de la goutte en résultant. Ce travail a permis de déterminer les conditions optimales, à l'échelle d'une inclusion unique, pour encapsuler une goutte selon ce procédé, condition préalable au développement d’un pilote industriel associé à une production en continu.

The applications concerned by microencapsulation are constantly growing and cover sectors of industrial activities as varied as agriculture, pharmacy, food industry and even cosmetics. This work is a part of the development of a microencapsulation process based on sub-millimeter-sized drops crossing a liquid-liquid (L-L) interface under the influence of an external force, in this case centrifugal force. The objective of this work is to understand the hydrodynamics and interface mechanisms before, during and after the passage of a drop through a L-L interface, and leading to its coating. For this purpose, numerical and experimental approaches have been…

Advisors/Committee Members: Le Sauze, Nathalie (thesis director), Massiera, Gladys (thesis director).

Subjects/Keywords: Encapsulation; Écoulement multiphasique; Méthode « Level-Set »; Traversée d’interface; Goutte; Encapsulation; Multiphase flow; Interface crossing; Level-set method; Droplet

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

APA (6^th Edition):

El Itawi, H. (2020). Crossing of a liquid-liquid interface by a droplet under centrifugal effect for a micro-encapsulation process : Traversée d'une interface liquide-liquide par une goutte sous l'effet centrifuge pour un procédé de micro-encapsulation. (Doctoral Dissertation). INP Toulouse. Retrieved from http://www.theses.fr/2020INPT0039

Chicago Manual of Style (16^th Edition):

El Itawi, Hassan. “Crossing of a liquid-liquid interface by a droplet under centrifugal effect for a micro-encapsulation process : Traversée d'une interface liquide-liquide par une goutte sous l'effet centrifuge pour un procédé de micro-encapsulation.” 2020. Doctoral Dissertation, INP Toulouse. Accessed March 07, 2021. http://www.theses.fr/2020INPT0039.

MLA Handbook (7^th Edition):

El Itawi, Hassan. “Crossing of a liquid-liquid interface by a droplet under centrifugal effect for a micro-encapsulation process : Traversée d'une interface liquide-liquide par une goutte sous l'effet centrifuge pour un procédé de micro-encapsulation.” 2020. Web. 07 Mar 2021.

Vancouver:

El Itawi H. Crossing of a liquid-liquid interface by a droplet under centrifugal effect for a micro-encapsulation process : Traversée d'une interface liquide-liquide par une goutte sous l'effet centrifuge pour un procédé de micro-encapsulation. [Internet] [Doctoral dissertation]. INP Toulouse; 2020. [cited 2021 Mar 07]. Available from: http://www.theses.fr/2020INPT0039.

Council of Science Editors:

El Itawi H. Crossing of a liquid-liquid interface by a droplet under centrifugal effect for a micro-encapsulation process : Traversée d'une interface liquide-liquide par une goutte sous l'effet centrifuge pour un procédé de micro-encapsulation. [Doctoral Dissertation]. INP Toulouse; 2020. Available from: http://www.theses.fr/2020INPT0039

Purdue University

24. Griffin-Oliver, Courtney Janai. Set and element-level compatibility of spatial and location-word stimuli paired to eye-movement, vocal, and keypress response modalities.

Degree: MS, Psychological Sciences, 2016, Purdue University

URL: https://docs.lib.purdue.edu/open_access_theses/946

► Set-level and element-level compatibility are two ways to differentiate between different components of stimulus-response compatibility. Element-level compatibility (the difference between incongruent and congruent mappings)… (more)

Subjects/Keywords: Behavioral Psychology; Element-level compatibility; Eye movement; Set-level compatibility; Psychology; Social and Behavioral Sciences

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APA (6^th Edition):

Griffin-Oliver, C. J. (2016). Set and element-level compatibility of spatial and location-word stimuli paired to eye-movement, vocal, and keypress response modalities. (Thesis). Purdue University. Retrieved from https://docs.lib.purdue.edu/open_access_theses/946

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

Chicago Manual of Style (16^th Edition):

Griffin-Oliver, Courtney Janai. “Set and element-level compatibility of spatial and location-word stimuli paired to eye-movement, vocal, and keypress response modalities.” 2016. Thesis, Purdue University. Accessed March 07, 2021. https://docs.lib.purdue.edu/open_access_theses/946.

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

MLA Handbook (7^th Edition):

Griffin-Oliver, Courtney Janai. “Set and element-level compatibility of spatial and location-word stimuli paired to eye-movement, vocal, and keypress response modalities.” 2016. Web. 07 Mar 2021.

Vancouver:

Griffin-Oliver CJ. Set and element-level compatibility of spatial and location-word stimuli paired to eye-movement, vocal, and keypress response modalities. [Internet] [Thesis]. Purdue University; 2016. [cited 2021 Mar 07]. Available from: https://docs.lib.purdue.edu/open_access_theses/946.

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

Council of Science Editors:

Griffin-Oliver CJ. Set and element-level compatibility of spatial and location-word stimuli paired to eye-movement, vocal, and keypress response modalities. [Thesis]. Purdue University; 2016. Available from: https://docs.lib.purdue.edu/open_access_theses/946

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

University of California – Berkeley

25. Kazi, Michaeel Majeed. Smooth Interface Reconstruction from Volume Fraction Data Using Variational Techniques and Level Set Methods.

Degree: Mathematics, 2013, University of California – Berkeley

URL: http://www.escholarship.org/uc/item/2466j56f

► The volume fraction data structure describes the location of a given material within space. It partitions a domain into a set of discrete cells, and… (more)

Subjects/Keywords: Applied mathematics; Level Set Methods; minimal surfaces; multiphase; reconstruction; Volume fractions

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APA (6^th Edition):

Kazi, M. M. (2013). Smooth Interface Reconstruction from Volume Fraction Data Using Variational Techniques and Level Set Methods. (Thesis). University of California – Berkeley. Retrieved from http://www.escholarship.org/uc/item/2466j56f

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

Chicago Manual of Style (16^th Edition):

Kazi, Michaeel Majeed. “Smooth Interface Reconstruction from Volume Fraction Data Using Variational Techniques and Level Set Methods.” 2013. Thesis, University of California – Berkeley. Accessed March 07, 2021. http://www.escholarship.org/uc/item/2466j56f.

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

MLA Handbook (7^th Edition):

Kazi, Michaeel Majeed. “Smooth Interface Reconstruction from Volume Fraction Data Using Variational Techniques and Level Set Methods.” 2013. Web. 07 Mar 2021.

Vancouver:

Kazi MM. Smooth Interface Reconstruction from Volume Fraction Data Using Variational Techniques and Level Set Methods. [Internet] [Thesis]. University of California – Berkeley; 2013. [cited 2021 Mar 07]. Available from: http://www.escholarship.org/uc/item/2466j56f.

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

Council of Science Editors:

Kazi MM. Smooth Interface Reconstruction from Volume Fraction Data Using Variational Techniques and Level Set Methods. [Thesis]. University of California – Berkeley; 2013. Available from: http://www.escholarship.org/uc/item/2466j56f

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

Penn State University

26. Baran, Matthew Stephen. A Computational Study of Robustness in Level Set Surface Reconstruction.

Degree: 2012, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/13717

► This thesis examines the performance of the local level set method on the surface reconstruction problem for unorganized point clouds in three dimensions. Many laser-ranging,… (more)

Subjects/Keywords: Surface reconstruction; Level set method; Point Cloud; Robustness

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APA (6^th Edition):

Baran, M. S. (2012). A Computational Study of Robustness in Level Set Surface Reconstruction. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/13717

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

Chicago Manual of Style (16^th Edition):

Baran, Matthew Stephen. “A Computational Study of Robustness in Level Set Surface Reconstruction.” 2012. Thesis, Penn State University. Accessed March 07, 2021. https://submit-etda.libraries.psu.edu/catalog/13717.

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

MLA Handbook (7^th Edition):

Baran, Matthew Stephen. “A Computational Study of Robustness in Level Set Surface Reconstruction.” 2012. Web. 07 Mar 2021.

Vancouver:

Baran MS. A Computational Study of Robustness in Level Set Surface Reconstruction. [Internet] [Thesis]. Penn State University; 2012. [cited 2021 Mar 07]. Available from: https://submit-etda.libraries.psu.edu/catalog/13717.

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

Council of Science Editors:

Baran MS. A Computational Study of Robustness in Level Set Surface Reconstruction. [Thesis]. Penn State University; 2012. Available from: https://submit-etda.libraries.psu.edu/catalog/13717

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

Brigham Young University

27. Bryson, Joshua A. Soap Bubbles and Solid Spheres: Collisions and Interactions.

Degree: MS, 2011, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4015&context=etd

► Under the right conditions, a moving sphere may successfully enter, and leave, a soap bubble without rupturing that bubble. The physics behind this phenomena are… (more)

Subjects/Keywords: soap bubbles; lapace equation; level set method; weber number; Mechanical Engineering

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APA (6^th Edition):

Bryson, J. A. (2011). Soap Bubbles and Solid Spheres: Collisions and Interactions. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4015&context=etd

Chicago Manual of Style (16^th Edition):

Bryson, Joshua A. “Soap Bubbles and Solid Spheres: Collisions and Interactions.” 2011. Masters Thesis, Brigham Young University. Accessed March 07, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4015&context=etd.

MLA Handbook (7^th Edition):

Bryson, Joshua A. “Soap Bubbles and Solid Spheres: Collisions and Interactions.” 2011. Web. 07 Mar 2021.

Vancouver:

Bryson JA. Soap Bubbles and Solid Spheres: Collisions and Interactions. [Internet] [Masters thesis]. Brigham Young University; 2011. [cited 2021 Mar 07]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4015&context=etd.

Council of Science Editors:

Bryson JA. Soap Bubbles and Solid Spheres: Collisions and Interactions. [Masters Thesis]. Brigham Young University; 2011. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=4015&context=etd

Brigham Young University

28. Patty, Spencer R. 3D Image Reconstruction and Level Set Methods.

Degree: MS, 2011, Brigham Young University

URL: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3811&context=etd

► We give a concise explication of the theory of level set methods for modeling motion of an interface as well as the numerical implementation of… (more)

Subjects/Keywords: Level Set Method; PDE; Differential Geometry; Computer Vision; 3D Reconstruction; Mathematics

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

APA (6^th Edition):

Patty, S. R. (2011). 3D Image Reconstruction and Level Set Methods. (Masters Thesis). Brigham Young University. Retrieved from https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3811&context=etd

Chicago Manual of Style (16^th Edition):

Patty, Spencer R. “3D Image Reconstruction and Level Set Methods.” 2011. Masters Thesis, Brigham Young University. Accessed March 07, 2021. https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3811&context=etd.

MLA Handbook (7^th Edition):

Patty, Spencer R. “3D Image Reconstruction and Level Set Methods.” 2011. Web. 07 Mar 2021.

Vancouver:

Patty SR. 3D Image Reconstruction and Level Set Methods. [Internet] [Masters thesis]. Brigham Young University; 2011. [cited 2021 Mar 07]. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3811&context=etd.

Council of Science Editors:

Patty SR. 3D Image Reconstruction and Level Set Methods. [Masters Thesis]. Brigham Young University; 2011. Available from: https://scholarsarchive.byu.edu/cgi/viewcontent.cgi?article=3811&context=etd

University of Ontario Institute of Technology

29. Khattak, Saad Rustam. A variational approach to mapping: an exploration of map representation for SLAM.

Degree: 2012, University of Ontario Institute of Technology

URL: http://hdl.handle.net/10155/273

► Simultaneous Localization and Mapping (SLAM) algorithms are used by autonomous robots to build or update maps of an environment while maintaining their position simultaneously. A… (more)

Subjects/Keywords: SLAM; Level set; Distance fields; Implicit surfaces; Mapping

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

APA (6^th Edition):

Khattak, S. R. (2012). A variational approach to mapping: an exploration of map representation for SLAM. (Thesis). University of Ontario Institute of Technology. Retrieved from http://hdl.handle.net/10155/273

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

Chicago Manual of Style (16^th Edition):

Khattak, Saad Rustam. “A variational approach to mapping: an exploration of map representation for SLAM.” 2012. Thesis, University of Ontario Institute of Technology. Accessed March 07, 2021. http://hdl.handle.net/10155/273.

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

MLA Handbook (7^th Edition):

Khattak, Saad Rustam. “A variational approach to mapping: an exploration of map representation for SLAM.” 2012. Web. 07 Mar 2021.

Vancouver:

Khattak SR. A variational approach to mapping: an exploration of map representation for SLAM. [Internet] [Thesis]. University of Ontario Institute of Technology; 2012. [cited 2021 Mar 07]. Available from: http://hdl.handle.net/10155/273.

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

Council of Science Editors:

Khattak SR. A variational approach to mapping: an exploration of map representation for SLAM. [Thesis]. University of Ontario Institute of Technology; 2012. Available from: http://hdl.handle.net/10155/273

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

University of Manchester

30. Etienam, Clement Oku. Structural and Shape Reconstruction using Inverse Problems and Machine Learning Techniques with Application to Hydrocarbon Reservoirs.

Degree: 2019, University of Manchester

URL: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318055

► This thesis introduces novel ideas in subsurface reservoir model calibration known as History Matching in the reservoir engineering community. The target of history matching is… (more)

▼ This thesis introduces novel ideas in subsurface reservoir model calibration known as History Matching in the reservoir engineering community. The target of history matching is to mimic historical pressure and production data from the producing wells with the output from the reservoir simulator for the sole purpose of reducing uncertainty from such models and improving confidence in production forecast. Ensemble based methods such as the Ensemble Kalman Filter (EnKF) and Ensemble Smoother with Multiple Data Assimilation (ES-MDA) as been proposed for history matching in literature. EnKF/ES-MDA is a Monte Carlo ensemble nature filter where the representation of the covariance is located at the mean of the ensemble of the distribution instead of the uncertain true model. In EnKF/ES-MDA calculation of the gradients is not required, and the mean of the ensemble of the realisations provides the best estimates with the ensemble on its own estimating the probability density. However, because of the inherent assumptions of linearity and Gaussianity of petrophysical properties distribution, EnKF/ES-MDA does not provide an acceptable history-match and characterisation of uncertainty when tasked with calibrating reservoir models with channel like structures. One of the novel methods introduced in this thesis combines a successive parameter and shape reconstruction using level set functions (EnKF/ES-MDA-level set) where the spatial permeability fieldsâ€™ indicator functions are transformed into signed distances. These signed distances functions (better suited to the Gaussian requirement of EnKF/ES-MDA) are then updated during the EnKF/ES-MDA inversion. The method outperforms standard EnKF/ES-MDA in retaining geological realism of channels during and after history matching and also yielded lower Root-Mean-Square function (RMS) as compared to the standard EnKF/ES-MDA. To improve on the petrophysical reconstruction attained with the EnKF/ES-MDA-level set technique, a novel parametrisation incorporating an unsupervised machine learning method for the recovery of the permeability and porosity field is developed. The permeability and porosity fields are posed as a sparse field recovery problem and a novel SELE (Sparsity-Ensemble optimization-Level-set Ensemble optimisation) approach is proposed for the history matching. In SELE some realisations are learned using the K-means clustering Singular Value Decomposition (K-SVD) to generate an overcomplete codebook or dictionary. This dictionary is combined with Orthogonal Matching Pursuit (OMP) to ease the ill-posed nature of the production data inversion, converting our permeability/porosity field into a sparse domain. SELE enforces prior structural information on the model during the history matching and reduces the computational complexity of the Kalman gain matrix, leading to faster attainment of the minimum of the cost function value. From the results shown in the thesis; SELE outperforms conventional EnKF/ES-MDA in matching the historical production data, evident in the lower RMS value… Advisors/Committee Members: THEODOROPOULOS, KONSTANTINOS K, BABAEI, MASOUD M, Villegas, Rossmary, Theodoropoulos, Konstantinos, Babaei, Masoud.

Subjects/Keywords: Inverse problem; Machine Learning; Ensemble Kalman Filter; Level set; History Matching

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

APA (6^th Edition):

Etienam, C. O. (2019). Structural and Shape Reconstruction using Inverse Problems and Machine Learning Techniques with Application to Hydrocarbon Reservoirs. (Doctoral Dissertation). University of Manchester. Retrieved from http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318055

Chicago Manual of Style (16^th Edition):

Etienam, Clement Oku. “Structural and Shape Reconstruction using Inverse Problems and Machine Learning Techniques with Application to Hydrocarbon Reservoirs.” 2019. Doctoral Dissertation, University of Manchester. Accessed March 07, 2021. http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318055.

MLA Handbook (7^th Edition):

Etienam, Clement Oku. “Structural and Shape Reconstruction using Inverse Problems and Machine Learning Techniques with Application to Hydrocarbon Reservoirs.” 2019. Web. 07 Mar 2021.

Vancouver:

Etienam CO. Structural and Shape Reconstruction using Inverse Problems and Machine Learning Techniques with Application to Hydrocarbon Reservoirs. [Internet] [Doctoral dissertation]. University of Manchester; 2019. [cited 2021 Mar 07]. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318055.

Council of Science Editors:

Etienam CO. Structural and Shape Reconstruction using Inverse Problems and Machine Learning Techniques with Application to Hydrocarbon Reservoirs. [Doctoral Dissertation]. University of Manchester; 2019. Available from: http://www.manchester.ac.uk/escholar/uk-ac-man-scw:318055

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Open Access Theses and Dissertations