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Dissertations / Theses on the topic 'Lagrangian surfaces'

Author: Grafiati
Published: 9 March 2023
Last updated: 10 March 2023

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1

Zhang, Liuyang [Verfasser], Wolfgang [Akademischer Betreuer] Soergel, Ernst [Akademischer Betreuer] Kuwert, and Guofang [Akademischer Betreuer] Wang. "On the gap phenomena of the Willmore and Lagrangian surfaces." Freiburg : Universität, 2021. http://d-nb.info/1233966200/34.

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2

BASTIANELLI, FRANCESCO. "The geometry of second symmetric product of curves." Doctoral thesis, Università degli Studi di Pavia, 2009. http://hdl.handle.net/10281/21080.

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We deal with several problems on the surfaces obtained as second symmetric products of smooth projective curves. In particular, we treat both some attempts at extending the notion of gonality for curves and some classical problems, as the study of the ample cone in the Néron-Severi group. Moreover, we develop a family of examples of Lagrangian surfaces having particular topological properties.
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3

Moruz, Marilena. "Étude des sous-variétés dans les variétés kählériennes, presque kählériennes et les variétés produit." Thesis, Valenciennes, 2017. http://www.theses.fr/2017VALE0003/document.

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Cette thèse est constituée de quatre chapitres. Le premier contient les notions de base qui permettent d'aborder les divers thèmes qui y sont étudiés. Le second est consacré à l'étude des sous-variétés lagrangiennes d'une variété presque kählérienne. J'y présente les résultats obtenus en collaboration avec Burcu Bektas, Joeri Van der Veken et Luc Vrancken. Dans le troisième, je m'intéresse à un problème de géométrie différentielle affine et je donne une classification des hypersphères affines qui sont isotropiques. Ce résultat a été obtenu en collaboration avec Luc Vrancken. Et enfin dans le d
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4

Malic, Goran. "Grothendieck's dessins d'enfants and the combinatorics of Coxeter groups." Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/grothendiecks-dessins-denfants-and-the-combinatorics-of-coxeter-groups(dd51878a-7b63-4bd2-9d27-74f10350d44e).html.

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In this thesis we study the properties of Lagrangian matroids of dessins d'enfants (also known as maps on orientable surfaces) and their behaviour under the action of the absolute Galois group Gal(Q). We show that while the Lagrangian matroid of a dessin itself is not invariant under this action, some of its properties, namely its width and parity, are. We also study the partial duals of a dessin and their Lagrangian matroids and show that certain partial duals can always be defined over their field of moduli. We prove some results on the representations of Lagrangian matroids as well. A relat
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5

Ferraz, Marcus Vinicíus de Souza. "Interação fluido-estrutura no contato lubrificado entre asperezas e plano rígido via elementos finitos." Universidade Federal de Juiz de Fora (UFJF), 2018. https://repositorio.ufjf.br/jspui/handle/ufjf/6693.

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Submitted by Geandra Rodrigues (geandrar@gmail.com) on 2018-04-18T13:51:58Z No. of bitstreams: 1 marcusviniciusdesouzaferraz.pdf: 4103901 bytes, checksum: e4adcd64380c6ba8941b29bcc9d0abfd (MD5)<br>Approved for entry into archive by Adriana Oliveira (adriana.oliveira@ufjf.edu.br) on 2018-04-19T17:48:41Z (GMT) No. of bitstreams: 1 marcusviniciusdesouzaferraz.pdf: 4103901 bytes, checksum: e4adcd64380c6ba8941b29bcc9d0abfd (MD5)<br>Made available in DSpace on 2018-04-19T17:48:41Z (GMT). No. of bitstreams: 1 marcusviniciusdesouzaferraz.pdf: 4103901 bytes, checksum: e4adcd64380c6ba8941b29bcc9d0abfd (
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6

Silverberg, Jon P. "On Lagrangian meshless methods in free-surface flows." Thesis, (1.7 MB), 2005. http://edocs.nps.edu/AR/topic/theses/2005/Jan/05Jan_Silverberg.pdf.

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Thesis (Master of Engineering in Ocean Engineering)--University of California at Berkeley, 2004.<br>"January 2005." Description based on title screen as viewed on May 25, 2010. DTIC Descriptor(s): Fluid Dynamics, Lagrangian Functions, Equations Of Motion, Acceleration, Formulations, Grids, Continuum Mechanics, Gaussian Quadrature, Derivatives (Mathematics), Compact Disks, Boundary Value Problems, Polynomials, Interpolation, Pressure, Operators (Mathematics). DTIC Identifier(s): Multimedia (CD-Rom), Moving Grids, Meshless Discretization, Lifs (Lagrange Implicit Fraction Step), Lagrangian Dynami
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7

Battista, Thomas Andrew. "Lagrangian Mechanics Modeling of Free Surface-Affected Marine Craft." Diss., Virginia Tech, 2018. http://hdl.handle.net/10919/82928.

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Although ships have been used for thousands of years, modeling the dynamics of marine craft has historically been restricted by the complex nature of the hydrodynamics. The principal challenge is that the vehicle motion is coupled to the ambient fluid motion, effectively requiring one to solve an infinite dimensional set of equations to predict the hydrodynamic forces and moments acting on a marine vehicle. Additional challenges arise in parametric modeling, where one approximates the fluid behavior using reduced-order ordinary differential equations. Parametric models are typically required f
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8

Lê, Thanh-Tâm. "Surfaces lagrangiennes dans les surfaces projectives complexes." Paris 7, 2002. http://www.theses.fr/2002PA077104.

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9

Mazzini, Ana Paula. "Um método de Lagrangianos aumentados e sua aplicação em otimização de malhas." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-29032012-141547/.

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Métodos de Lagrangianos aumentados são muito utilizados para resolver problemas de minimização de funções sujeitas a restrições gerais. Em particular, estudamos um método de Lagrangianos aumentados que utiliza a função PHR, implementado em ALGENCAN, e observamos seu comportamento quando o aplicamos na resolução de um problema encontrado na área de Computação Gráfica. O problema estudado é um problema encontrado na geração de malhas de superfícies, na etapa de pós-processamento, para o qual propomos uma técnica de otimização visando a melhoria dos elementos da malha. Quando se trata de geração
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10

Doukouré, Moussa. "Variabilité des flux turbulents de surface au sein du bassin versant d'Ara au Bénin." Thesis, Grenoble, 2011. http://www.theses.fr/2011GRENU014/document.

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La circulation atmosphérique en Afrique de l'Ouest est caractérisée par des vents de sud-ouest (mousson) pendant la saison humide et par des vents de nord-est (harmattan) pendant la saison sèche. Cette alternance des saisons est due aux variations de pression liée à l'état des surfaces (rugosité, albédo, végétation) en réaction au forçage solaire. Ces mêmes états de surface génèrent une variabilité de flux turbulents de surface et des circulations secondaires qui rendent complexes les analyses des mesures effectuées sur place en vue de documenter les interactions surface-atmosphère. La modélis
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11

Bograd, Steven J. "Lagrangian observations of the near-surface circulation in the North Pacific, 1990-1995." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape15/PQDD_0008/NQ34514.pdf.

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12

De, Souza Ronald Buss. "Satellite and Lagrangian observations of mesoscale surface processes in the southwestern Atlantic Ocean." Thesis, University of Southampton, 2000. https://eprints.soton.ac.uk/42084/.

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This work presents a study of the mesoscale surface processes occurring in the Southwestern Atlantic Ocean. Two regions in this ocean, the Brazil-Malvinas (Falkland) Confluence (BMC) Zone and the South Brazilian Continental Shelf (SBCS) are studied by means of a 14 year long series of low-resolution Multi-Channel Sea Surface Temperature (MCSST) images of the Advanced Very High Resolution Radiometer (AVHRR) together with high-resolution data from the same sensor and Lagrangian (buoy) data for the period between March 1993 and July 1994. The AVHRR and buoy data were available from the project CO
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13

Mao, Zirui. "A Novel Lagrangian Gradient Smoothing Method for Fluids and Flowing Solids." University of Cincinnati / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1553252214052311.

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14

Filippi, Margaux(Martin-Filippi). "Advancing the theory and applications of Lagrangian Coherent Structures methods for oceanic surface flows." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122328.

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Thesis: Sc. D., Joint Program in Applied Ocean Science and Engineering (Massachusetts Institute of Technology, Department of Earth, Atmospheric, and Planetary Sciences; and the Woods Hole Oceanographic Institution), 2019<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 207-218).<br>Ocean surface transport is at the core of many environmental disasters, including the spread of marine plastic pollution, the Deepwater Horizon oil spill and the Fukushima nuclear contamination. Understanding and predicting flow transport, however, remains a scientific challenge
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15

Khemar, Idrisse. "Systèmes intégrables intervenant en géométrie différentielle et en physique mathématique." Phd thesis, Université Paris-Diderot - Paris VII, 2006. http://tel.archives-ouvertes.fr/tel-00277998.

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Notre thèse est divisée en 2 chapitres indépendants correspondant chacun à un article. Dans le premier chapitre, nous définissons une notion de surfaces isotropes dans les octonions, i.e. sur lesquelles certaines formes symplectiques canoniques s'annulent. En utilisant le produit vectoriel dans O, nous définissons une application rho de la grassmanienne des plans de O dans la sphère de dimension 6. Cela nous permet d'associer à chaque surface Sigma de O une fonction rho_Sigma de la surface sur la sphère. Alors, nous montrons que les surfaces isotropes de O telles que cette fonction est harmoni
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16

McAlpine, Jerrold D. "Lagrangian stochastic dispersion modeling in the atmospheric surface layer with an embedded strong flow perturbation." abstract and full text PDF (UNR users only), 2009. http://0-gateway.proquest.com.innopac.library.unr.edu/openurl?url_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:dissertation&res_dat=xri:pqdiss&rft_dat=xri:pqdiss:1464451.

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17

Huang, Lingyan. "Mass transport due to surface waves in a water-mud system." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B35380457.

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18

Cornejo, Velázquez Alejandro. "A fully Lagrangian formulation for fluid-structure interaction between free-surface flows and multi-fracturing solids." Doctoral thesis, Universitat Politècnica de Catalunya, 2020. http://hdl.handle.net/10803/670376.

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It is well known that in civil engineering structures are designed so that they remain,whenever possible, in an elastic regime and with their mechanical properties intact. The truth isthat in reality there are uncertainties either in the execution of the work (geometric errors ormaterial quality) or during its subsequent use (loads not contemplated or its value has beenestimated incorrectly) that can lead to the collapse of the structure. This is why the study of thefailure of structures is inherently interesting and, once is known, its design can be improvedto be the less catastrophic as poss
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19

Jung, Se Yong. "Determining Parameters for a Lagrangian Mechanical System Model of a Submerged Vessel Maneuvering in Waves." Diss., Virginia Tech, 2020. http://hdl.handle.net/10919/97332.

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In this dissertation, an approach for determining parameters for a nonlinear Lagrangian mechanical system model of a submerged vessel maneuvering near waves is presented. The nonlinear model with determined parameters is capable of capturing nonlinear effects neglected by other linear models, and therefore can be applied to improve maneuvering performance and expand the operating envelope for submerged vessels operating in elevated sea states. To begin, a first principles Lagrangian nonlinear maneuvering (LNM) model for a surface-affected submerged vessel derived by using Lagrangian mechanics
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20

Vilar, François. "Utilisation des méthodes Galerkin discontinues pour la résolution de l'hydrodynamique Lagrangienne bi-dimentsionnelle." Thesis, Bordeaux 1, 2012. http://www.theses.fr/2012BOR14605/document.

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Le travail présenté ici avait pour but le développement d'un schéma de type Galerkin discontinu (GD) d'ordre élevé pour la résolution des équations de la dynamique des gaz écrites dans un formalisme Lagrangien total, sur des maillages bi-dimensionnels totalement déstructurés. À cette fin, une méthode progressive a été utilisée afin d'étudier étape par étape les difficultés numériques inhérentes à la discrétisation Galerkin discontinue ainsi qu'aux équations de la dynamique des gaz Lagrangienne. Par conséquent, nous avons développé dans un premier temps des schémas de type Galerkin discontinu j
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21

Huang, Lingyan, and 黃凌燕. "Mass transport due to surface waves in a water-mud system." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B35380457.

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22

Montefuscolo, Felipe. "Métodos numéricos para escoamentos com linhas de contato dinâmicas." Universidade de São Paulo, 2012. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-24042013-150545/.

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O fenômeno de molhamento, estudo de como um líquido se deposita em um sólido, apresenta problemas ainda em aberto, dos pontos de vista da modelagem física e da simulação numérica. O maior interesse acadêmico neste tipo de escoamento é a linha tríplice (ou linha de contato) formada da interação sólido-líquido-gás. A condição de contorno clássica de não escorregamento na interface líquido-sólido leva a uma singularidade no tensor de tensões nesta linha. Além disso, ainda não está estabelecido qual o melhor modelo para descrever o ângulo de contato formado entre a superfície livre e o substrato (
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23

Mandallena, Michel. "Utilisation de méthodes de contrôle optimal pour résoudre des problèmes liés à la furtivité électromagnétique." Grenoble 1, 1993. http://www.theses.fr/1993GRE10160.

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Cette étude concerne la mise en œuvre de méthodes d'optimisation de type contrôle optimal sur les équations de Maxwell, dans le but de résoudre un grand nombre de problèmes liés à la furtivité électromagnétique. Il s'agit ainsi de créer des outils performants d'aide à la conception d'objets discrets. Nous nous sommes limités dans cette thèse à l'étude des problèmes 2D (représentant une configuration 3D cylindrique) pour lesquels nous avons choisi une représentation équations intégrales. De cette formulation, nous avons extrait deux types de paramètres d'optimisation: la forme de la section pla
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24

Quemar, Pierrick. "Modélisation et analyse numérique des écoulements à surface libre." Thesis, Paris 13, 2019. http://www.theses.fr/2019PA131022.

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Dans cette thèse, nous nous intéressons à la résolution numérique des équations tridimensionnelles de Navier–Stokes à surface libre, écrites sous formalisme ALE, par la méthode des éléments finis. Ces équations permettent la représentation d’écoulements environnementaux. L’objectif initial et principal porte sur une analyse précise des limitations existantes des méthodes numériques et de possibles voies d’amélioration, mathématiquement justifiées, afin de réviser et d’améliorer le cœur numérique du code hydrodynamique Telemac-3D, développé par le Laboratoire National d’Hydraulique et Environne
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Tsukamoto, Marcio Michiharu. "Desenvolvimento do método de partículas na representação de corpos flutuantes em ondas altamente não-lineares." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/3/3135/tde-19092006-111325/.

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O método numérico para fluidos incompressíveis desenvolvido no presente estudo é o Moving Particle Semi-Implicit Method (MPS) que enxerga o domínio discretizado em partículas, é baseado em representação lagrangeana e não tem a necessidade de utilização de malhas. O método MPS tem como equações governantes uma forma particular da equação de Navier-Stokes e a equação da continuidade para fluidos incompressíveis e não viscosos. Os métodos de simulação de fluidos mais comumente utilizados são baseados em representação euleriana e utilizam malhas para descrever a geometria do domínio a ser simulado
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26

Allievi, Alejandro. "On nonlinear free surface potential flow by a Bubnov-Galerkin formulation in space and a semi-lagrangian semi-implicit scheme in time." Thesis, University of British Columbia, 1993. http://hdl.handle.net/2429/41452.

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The potential flow initial-boundary value problem describing fluid-structure interaction with fully nonlinear free surface boundary conditions has been studied using a mixed Lagrangian-Eulerian formulation. The boundary-value problem has been solved in the physical domain by means of a Bubnov-Galerkin formulation of the Laplace equation. The initialvalue problem related to the behavior of some of the moving boundaries has been discretized using various numerical techniques. Among these is a series of predictor-corrector methods. These methodologies proved to require considerable numerica
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27

Estacio, Kémelli Campanharo. "Simulação de escoamento de fluidos em superfícies definidas por pontos não organizados." Universidade de São Paulo, 2008. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-04032009-111403/.

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Atualmente diversos produtos são fabricados por meio de injeção de polímeros, num processo denominado moldagem por injeção: material fundido é injetado em um molde no qual resfria e endurece. Contudo, ao contrário de outros processos de produção, a qualidade da peça criada por meio de moldagem por injeção não depende apenas do material e da sua forma geométrica, mas também da maneira na qual o material é processado durante a moldagem. Por esse motivo, o uso de modelagem matemática e simulações numéricas tem aumentado consideravelmente como maneira de auxiliar o processo de produção e tem-se to
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28

Lindgren, Georg. "Physical process effects on catchment-scale pollutant transport-attenuation, coastal loading and abatement efficiency." Doctoral thesis, KTH, Mark- och vattenteknik, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3900.

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Pollutants follow various subsurface and surface water pathways from sources within a catchment to its outlet and may cause detrimental effects on downstream water quality and ecosystems. Along their different transport pathways through a catchment, pollutants may be attenuated subject to different physical and biogeochemical processes. In this thesis, physical process effects on such catchment-scale pollutant transport and attenuation, resulting coastal pollutant loading and its efficient abatement are investigated. For this purpose, pollutant transport-attenuation is modeled both generically
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29

Doukoure, Moussa. "Variabilité des flux turbulents de surface au sein du bassin versant d'Ara au Bénin." Phd thesis, Université de Grenoble, 2011. http://tel.archives-ouvertes.fr/tel-00693477.

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La circulation atmosphérique en Afrique de l'Ouest est caractérisée par des vents de sud-ouest (mousson) pendant la saison humide et par des vents de nord-est (harmattan) pendant la saison sèche. Cette alternance des saisons est due aux variations de pression liée à l'état des surfaces (rugosité, albédo, végétation) en réaction au forçage solaire. Ces mêmes états de surface génèrent une variabilité de flux turbulents de surface et des circulations secondaires qui rendent complexes les analyses des mesures effectuées sur place en vue de documenter les interactions surface-atmosphère. La modélis
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30

Helbling, Marc. "Sculpture virtuelle par système de particules." Thesis, Rouen, INSA, 2010. http://www.theses.fr/2010ISAM0030/document.

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La 3D s'impose comme un nouveau média dont l'adoption généralisée passe par la conception d'outils, accessibles au grand public, de création et de manipulation de formes tridimensionnelles quelconques. Les outils actuels reposent fortement sur la modélisation sous-jacente des formes, généralement surfacique, et sont alors peu intuitifs ou limitatifs dans l'expressivité offerte à l'utilisateur.Nous souhaitons, dans ces travaux, définir une approche ne présentant pas ces défauts et permettant à l'utilisateur de se concentrer sur le processus créatif. En nous inspirant de l'utilisation séculaire
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Ahmad, Alexandre. "Animation de structures déformables et modélisation des interactions avec un fluide basées sur des modèles physiques." Limoges, 2007. https://aurore.unilim.fr/theses/nxfile/default/4f73d6f8-b8f0-4794-924b-8f827db44689/blobholder:0/2007LIMO4046.pdf.

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Je présente dans cette thèse des travaux concernant la simulation d'interactions entre un fluide et des membranes déformables. Ce sujet ne manque pas d'applications puisque l'interaction d'un fluide avec des feuilles, des tissus ou même des nageoires de poisson est un scénario courant. Pourtant, peu de travaux en synthèse d'images se sont intéressés à reproduire ce phénomène. Pour ce faire, je propose un algorithme de réaction de contacts entre un fluide Lagrangien et une membrane déformable qui est indépendant du pas d'intégration temporelle. Afin de pallier les artefacts visuels dus à des tr
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Berke, Peter. "Numerical modeling of the surface and the bulk deformation in a small scale contact: application to the nanoindentation interpretation and to the micro-manipulation." Doctoral thesis, Universite Libre de Bruxelles, 2008. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210393.

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<p align='justify'>L’adaptation des surfaces pour des fonctions prédéterminées par le choix des matériaux métalliques ou des couches minces ayant des propriétés mécaniques avancées peut potentiellement permettre de réaliser des nouvelles applications à petites échelles. Concevoir de telles applications utilisant des nouveaux matériaux nécessite en premier lieu la connaissance des propriétés mécaniques des matériaux ciblés à l’échelle microscopique et nanoscopique. Une méthode souvent appliquée pour caractériser les matériaux à petites échelles est la nanoindentation, qui peut être vue comme un
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Arpaia, Luca. "Adaptive techniques for free surface flow simulations : Application to the study of the 2011 Tohoku Tsunami." Thesis, Bordeaux, 2017. http://www.theses.fr/2017BORD0666.

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Dans cette thèse, nous implémentons les équations de Saint Venant (SV), ou de Shallow Water, sur des grilles non structurées afin de simuler des écoulements de surface libre sur des bathymétries irrégulières, incluant inondation et d'autres phénomènes complexes qui se produisent généralement dans des applications hydrodynamiques. En particulier, nous voudrions simuler avec précision les tsunamis, la propagation d'onde à grande échelle jusqu'à l'inondation très localisé. À cette fin, nous utilisons deux méthodes qui sont comparées en profondeur le long du manuscrit: la méthode des volumes finis
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Bonetto, Alexis. "Etude de l'indentation et de la fatigue des contacts roulants." Thesis, Lyon, 2020. http://www.theses.fr/2020LYSEI030.

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La fatigue de surface est aujourd'hui la principale cause de défaillances des roulements. Ce type de fatigue peut se développer du simple fait de la rugosité des surfaces mais est exacerbée par la présence de défauts de surface tels que les indents. La gestion de la pollution des lubrifiants, à l'origine de l'indentation des surfaces, est très coûteuse et ne peut être parfaite puisque la pollution est à la fois présente dans les huiles neuves, générée de manière continue par les systèmes lubrifiés et introduite lors des opérations sur le système. En conséquence, les huiles charrient systématiq
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35

Rocha, Kelvin Raymond. "A variational approach for viewpoint-based visibility maximization." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/24816.

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Thesis (Ph.D.)--Electrical and Computer Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Allen R. Tannenbaum; Committee Member: Anthony J. Yezzi; Committee Member: Gregory Turk; Committee Member: Joel R. Jackson; Committee Member: Patricio A. Vela
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36

Resseguier, Valentin. "Mixing and fluid dynamics under location uncertainty." Thesis, Rennes 1, 2017. http://www.theses.fr/2017REN1S004/document.

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Cette thèse concerne le développement, l'extension et l'application d'une formulation stochastique des équations de la mécanique des fluides introduite par Mémin (2014). La vitesse petite échelle, non-résolue, est modélisée au moyen d'un champ aléatoire décorrélé en temps. Cela modifie l'expression de la dérivée particulaire et donc les équations de la mécanique des fluides. Les modèles qui en découlent sont dénommés modèles sous incertitude de position. La thèse s'articulent autour de l'étude successive de modèles réduits, de versions stochastiques du transport et de l'advection à temps long
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37

"Lagrangian angles of foliation in R² under curve shortening flow." 2011. http://library.cuhk.edu.hk/record=b5894787.

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Ma, Man Shun.<br>Thesis (M.Phil.)--Chinese University of Hong Kong, 2011.<br>Includes bibliographical references (leaves 75-76).<br>Abstracts in English and Chinese.<br>Chapter 1 --- Introduction --- p.6<br>Chapter 2 --- Basic notions in Riemannian geometry --- p.10<br>Chapter 2.1 --- Basic manifold theory --- p.11<br>Chapter 2.2 --- "Connection, curvature" --- p.19<br>Chapter 2.3 --- Submanifold theory --- p.29<br>Chapter 3 --- Basic facts in symplectic and complex geometry --- p.33<br>Chapter 3.1 --- "Symplectic manifolds, Lagrangian submanifolds" --- p.34<br>Chapter 3.2 --- Kahler an
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Yang, Yue. "Lagrangian and Vortex-Surface Fields in Turbulence." Thesis, 2011. https://thesis.library.caltech.edu/6251/1/Thesis_Yue_Yang.pdf.

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<p>In this thesis, we focus on Lagrangian investigations of isotropic turbulence, wall-bounded turbulence and vortex dynamics. In particular, the evolutionary multi-scale geometry of Lagrangian structures is quantified and analyzed. Additionally, we also study the dynamics of vortex-surface fields for some simple viscous flows with both Taylor--Green and Kida--Pelz initial conditions.</p> <p>First, we study the non-local geometry of finite-sized Lagrangian structures in both stationary, evolving homogenous isotropic turbulence and also with a frozen turbulent velocity field. The multi-scale
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Huang, Chi-Yang, and 黃啟暘. "Surface-Wave Propagation on a Gentle Bottom with Lagrangian Form." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/86006916683934806032.

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碩士<br>國立中山大學<br>海洋環境及工程學系研究所<br>88<br>The main purpose of this paper is to analyze the surface progressive gravity waves propagating on a gentle sloping beach in two dimension. Instead of using the method of Eulerian system by the previous investigators, we introduce the governing equations completely in the Lagrangian system directly. All the characteristics of the wave system is expressed by a suitable perturbation expansion in the bottom slope under linearizing the problem in wave amplitude, then all the governing equations are systematically expanded to order. The solution of the wave
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Li, Meng-Syue, and 李孟學. "Lagrangian Analysis for Nonlinear Surface Waves Propagation on a Gentle Sloping Bottom." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/18338233927433443682.

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博士<br>國立中山大學<br>海洋環境及工程學系研究所<br>101<br>The purpose of this thesis is applying Lagrangian approach to analyze shoreward progressive waves over a gently sloping bottom. A series of laboratorial experiments were executed to validate the analytical results. Then, the theory is extended to the prediction of wave breaking and the resulting breaking criteria are shown to be more accurate than regression formula in the literature. In the analysis, a two-parameter perturbation were used that employs both bottom slope α and wave steepness ε , and the solution is expanded up to the order. Based on this
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ZHUANG, JIN-CHAN, and 莊金榮. "Rheological effect on turbulent diffusive processes Lagrangian analysis of sediment laden free surface flow." Thesis, 1986. http://ndltd.ncl.edu.tw/handle/13777010441415953247.

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42

Tseng, Kuang-ming, and 曾光明. "Statistical analysis of the surface circulation in the northern South China Sea using Lagrangian buoys." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/8kv3an.

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碩士<br>國立中山大學<br>海洋生物科技暨資源學系研究所<br>95<br>The surface circulation of the northern South China Sea (NSCS) for the period of 1986-2006 is studied using the data of more than 505 satellite-tracked drifters from NOAA/AOML database and the data from ten drifters which were released by our lab in the Penghu channel and in the Luzon Strait in 2006. In this study, the spatial structure and the temporal variability of the surface currents, at mesoscale to seasonal cycle, are described in terms of Eulerian and Lagrangian statistics from the drifter velocities that have been processed. Maps of mean current
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43

Neto, Diogo Mariano Simões. "Numerical Simulation of Frictional Contact Problems using Nagata Patches in Surface Smoothing." Doctoral thesis, 2014. http://hdl.handle.net/10316/26743.

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Tese de doutoramento em Engenharia Mecânica, na especialidade de Tecnologias de Produção, apresentada ao Departamento de Engenharia Mecânica da Faculdade de Ciências e Tecnologia da Universidade de Coimbra<br>All movements in the world involve contact and friction, from walking to car driving. The contact mechanics has application in many engineering problems, including the connection of structural members by bolts or screws, design of gears and bearings, sheet metal or bulk forming, rolling contact of car tyres, crash analysis of structures, as well as prosthetics in biomedical engineering. D
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Talavatifard, Habiballah. "Application of L1 Minimization Technique to Image Super-Resolution and Surface Reconstruction." Thesis, 2013. http://hdl.handle.net/1969.1/149512.

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A surface reconstruction and image enhancement non-linear finite element technique based on minimization of L1 norm of the total variation of the gradient is introduced. Since minimization in the L1 norm is computationally expensive, we seek to improve the performance of this algorithm in two fronts: first, local L1- minimization, which allows parallel implementation; second, application of the Augmented Lagrangian method to solve the minimization problem. We show that local solution of the minimization problem is feasible. Furthermore, the Augmented Lagrangian method can successfully be used
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Schaffer-Jin, Yulan. "Investigations on groundwater dewatering by using vertical circulation wells: Numerical simulation method development and field validation." Thesis, 2014. http://hdl.handle.net/11858/00-1735-0000-0022-5DE5-4.

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Die künstliche Grundwasserabsenkung stellt eine wichtige Maßnahme für die Entwässerung von Baugruben und bergbaulich genutzten Flächen dar. Eine erfolgreiche und zielgerichtete Absenkung des Grundwasserspiegels setzt ein zweckmäßiges Design und die richtige Auswahl der genutzten Absenkungstechniken voraus. Dabei sind insbesondere die Dimension des abzusenkenden Bereichs, die Untergrundbeschaffenheit sowie zu erfüllende umweltschutzrechtliche Regelungen zu berücksichtigen. Zur Grundwasserabsenkung kommen üblicherweise verschiedene Ausführungen und Anordnungen von Pumpbrunnen zum Einsatz. Konven
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Rioux-Lavoie, Damien. "Méthode SPH implicite d’ordre 2 appliquée à des fluides incompressibles munis d’une frontière libre." Thèse, 2017. http://hdl.handle.net/1866/19377.

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L’objectif de ce mémoire est d’introduire une nouvelle méthode smoothed particle hydrodynamics (SPH) implicite purement lagrangienne, pour la résolution des équations de Navier- Stokes incompressibles bidimensionnelles en présence d’une surface libre. Notre schéma de discrétisation est basé sur celui de Kéou Noutcheuwa et Owens [19]. Nous avons traité la surface libre en combinant la méthode multiple boundary tangent (MBT) de Yildiz et al. [43] et les conditions aux limites sur les champs auxiliaires de Yang et Prosperetti [42]. Ce faisant, nous obtenons un schéma de discrétisation
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