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Dissertations / Theses on the topic 'Mesh Free Method (Mechanics)'

Author: Grafiati
Published: 4 June 2021
Last updated: 6 September 2023

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1

Akyazi, Fatma Dilay. "Element-free Galerkin Method For Plane Stress Problems." Master's thesis, METU, 2010. http://etd.lib.metu.edu.tr/upload/12611685/index.pdf.

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In this study, the Element-Free Galerkin (EFG) method has been used for the analysis of plane stress problems. A computer program has been developed by using FORTRAN language. The moving least squares (MLS) approximation has been used in generating shape functions. The results obtained by the EFG method have been compared with analytical solution and the numerical results obtained by MSC. Patran/Nastran. The comparisons show that the mesh free method gives more accurate results than the finite element approximation with less computational effort.
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2

Wang, Xiaoling. "Mechanical analysis and free energy construction of phase transition in bacterial flagellar filaments /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?MECH%202006%20WANGX.

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3

Wang, Shuang. "A volumetric mesh-free deformation method for surgical simulation in virtual environments." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file, 78 p, 2009. http://proquest.umi.com/pqdweb?did=1885755951&sid=3&Fmt=2&clientId=8331&RQT=309&VName=PQD.

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4

Liang, Xiaodong, and 梁？東. "A comparative study of Galerkin mesh-free and finite element methods." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30147694.

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5

Mejia, Humberto. "Modeling of a Heat-Induced Buckling of Plates Using the Mesh-free Method." FIU Digital Commons, 2014. http://digitalcommons.fiu.edu/etd/1512.

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In the process of engineering design of structural shapes, the flat plate analysis results can be generalized to predict behaviors of complete structural shapes. In this case, the purpose of this project is to analyze a thin flat plate under conductive heat transfer and to simulate the temperature distribution, thermal stresses, total displacements, and buckling deformations. The current approach in these cases has been using the Finite Element Method (FEM), whose basis is the construction of a conforming mesh. In contrast, this project uses the mesh-free Scan Solve Method. This method elimina
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6

Yanagita, Tamaki. "MESH-FREE MODELING OF ULTRASONIC FIELDS GENERATED BY TRANSDUCERS AND ACOUSTIC MICROSCOPES." Diss., The University of Arizona, 2009. http://hdl.handle.net/10150/195234.

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With the gain in momentum of the structural health monitoring field in the last two decades, the popularity of ultrasonic nondestructive testing (NDT) has grown. However, ultrasonic NDT requires an expert to perform the testing and can be time consuming and costly when measured wave patterns in testing become extremely complex. A computer simulation of these tests can be utilized as a guide during actual evaluations or as a tool to train technicians. Presented in this dissertation is the development of models which simulate such acoustic phenomena as may arise in NDT. These models were develop
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7

Offermans, Nicolas. "Towards adaptive mesh refinement in Nek5000." Licentiate thesis, KTH, Mekanik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-217501.

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The development of adaptive mesh refinement capabilities in the field of computational fluid dynamics is an essential tool for enabling the simulation of larger and more complex physical problems. While such techniques have been known for a long time, most simulations do not make use of them because of the lack of a robust implementation. In this work, we present recent progresses that have been made to develop adaptive mesh refinement features in Nek5000, a code based on the spectral element method. These developments are driven by the algorithmic challenges posed by future exascale supercomp
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8

Alizada, Alaskar [Verfasser]. "The eXtended Finite Element Method (XFEM) with Adaptive Mesh Refinement for Fracture Mechanics / Alaskar Alizada." Aachen : Shaker, 2012. http://d-nb.info/1052408818/34.

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9

Ullah, Zahur. "Nonlinear solid mechanics analysis using the parallel selective element-free Galerkin method." Thesis, Durham University, 2013. http://etheses.dur.ac.uk/6978/.

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A variety of meshless methods have been developed in the last fifteen years with an intention to solve practical engineering problems, but are limited to small academic problems due to associated high computational cost as compared to the standard finite element methods (FEM). The main objective of this thesis is the development of an efficient and accurate algorithm based on meshless methods for the solution of problems involving both material and geometrical nonlinearities, which are of practical importance in many engineering applications, including geomechanics, metal forming and biomechan
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10

Mudrich, Jaime. "Development of a Coupling Model for Fluid-Structure Interaction using the Mesh-free Finite Element Method and the Lattice Boltzmann Method." FIU Digital Commons, 2013. http://digitalcommons.fiu.edu/etd/964.

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In the presented thesis work, the meshfree method with distance fields was coupled with the lattice Boltzmann method to obtain solutions of fluid-structure interaction problems. The thesis work involved development and implementation of numerical algorithms, data structure, and software. Numerical and computational properties of the coupling algorithm combining the meshfree method with distance fields and the lattice Boltzmann method were investigated. Convergence and accuracy of the methodology was validated by analytical solutions. The research was focused on fluid-structure interaction solu
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11

Karlsson, Tommy. "Simulations of 2D dynamic brittle fracture by the element-free Galerkin method and linear fracture mechanics." Doctoral thesis, Norwegian University of Science and Technology, Department of Structural Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-1988.

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12

Moroney, Timothy John. "An investigation of a finite volume method incorporating radial basis functions for simulating nonlinear transport." Thesis, Queensland University of Technology, 2006. https://eprints.qut.edu.au/16303/1/Timothy_Moroney_Thesis.pdf.

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The objective of this PhD research programme is to investigate the effectiveness of a finite volume method incorporating radial basis functions for simulating nonlinear transport processes. The finite volume method is the favoured numerical technique for solving the advection-diffusion equations that arise in transport simulation. The method transforms the original problem into a system of nonlinear, algebraic equations through the process of discretisation. The accuracy of this discretisation determines to a large extent the accuracy of the final solution. A new method of discretisatio
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13

Moroney, Timothy John. "An investigation of a finite volume method incorporating radial basis functions for simulating nonlinear transport." Queensland University of Technology, 2006. http://eprints.qut.edu.au/16303/.

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The objective of this PhD research programme is to investigate the effectiveness of a finite volume method incorporating radial basis functions for simulating nonlinear transport processes. The finite volume method is the favoured numerical technique for solving the advection-diffusion equations that arise in transport simulation. The method transforms the original problem into a system of nonlinear, algebraic equations through the process of discretisation. The accuracy of this discretisation determines to a large extent the accuracy of the final solution. A new method of discretisation is
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14

Yavuzbalkan, Erdem. "Free Vibration Analysis Of Anisotropic Laminated Composite Shells Of Revolution." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606505/index.pdf.

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In this thesis, the free vibration analysis of anisotropic laminated composite shells of revolution (ALCSOR) is studied. The governing equations are kinematic, constitutive, and motion equations. Geometrically linear strain-displacement equations of Reissner-Naghdi shell theory in combination with first-order shear deformation theory in which transverse shear and rotatory inertia effects are taken into consideration. The constitutive relations are for macrosopically ALCSOR in which statically equivalent force and moment resultants, instead of internal stresses for a single layer, are introduce
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15

Shojaei, Barjoui Arman. "On the coupling of peridynamics with the classical theory of continuum mechanics in a meshless framework." Doctoral thesis, Università degli studi di Padova, 2018. http://hdl.handle.net/11577/3423156.

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The classical theory of solid mechanics employs partial derivatives in the equation of motion and hence requires the differentiability of the displacement field. Such an assumption breaks down when simulation of problems containing discontinuities, such as cracks, comes into the picture. peridynamics is considered to be an alternative and promising nonlocal theory of solid mechanics that is formulated suitably for discontinuous problems. Peridynamics is well designed to cope with failure analysis as the theory deals with integral equations rather than partial differential equations. Indeed, pe
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16

Pasha, Hasan G. "Estimation of Static Stiffnesses from Free Boundary Dynamic (FRF) Measurements." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1416569956.

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17

Mårtensson, Jonathan. "Method development for investigation of real effects on flow around vanes." Thesis, Linköping University, Applied Thermodynamics and Fluid Mechanics, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-57605.

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<p>In the development of turbo machinery components it's desirable to not spend more time than necessary when setting up aero-thermal calculations to investigate uncertainties in the design. This report aims to describe general thoughts used in the development of an ICEM-mesh script and the possible configurations in the script file which enables the user to build mesh-grids with/without clearance gap at the hub and/or shroud for different blade geometries. It also aims to illustrate the performance analysis made on the Vinci LH2 turbine, a next generation upper stage engine to the Ariane 5 ro
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18

Sambasivan, Shiv Kumar. "A sharp interface Cartesian grid hydrocode." Diss., University of Iowa, 2010. https://ir.uiowa.edu/etd/593.

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Dynamic response of materials to high-speed and high-intensity loading conditions is important in several applications including high-speed flows with droplets, bubbles and particles, and hyper-velocity impact and penetration processes. In such high-pressure physics problems, simulations encounter challenges associated with the treatment of material interfaces, particularly when strong nonlinear waves like shock and detonation waves impinge upon them. To simulate such complicated interfacial dynamics problems, a fixed Cartesian grid approach in conjunction with levelset interface tracking is a
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19

Acharya, Arjun R. "Free energy differences : representations, estimators, and sampling strategies." Thesis, University of Edinburgh, 2004. http://hdl.handle.net/1842/602.

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In this thesis we examine methodologies for determining free energy differences (FEDs) of phases via Monte Carlo simulation. We identify and address three generic issues that arise in FED calculations; the choice of representation, the choice of estimator, and the choice of sampling strategy. In addition we discuss how the classical framework may be extended to take into account quantum effects. Key words: Phase Mapping, Phase Switch, Lattice Switch, Simulated Tempering, Multi-stage, Weighted Histogram Analysis Method, Fast Growth, Jarzynski method, Umbrella, Multicanonical, Path Integral Mont
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20

Biswas, Souvik. "Simulation of thermo-mechanical deformation in high speed rolling of long steel products." Link to electronic thesis, 2003. http://www.wpi.edu/Pubs/ETD/Available/etd-1027103-203032/.

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Thesis (M.S.)--Worcester Polytechnic Institute.<br>Keywords: product geometry; hot rolling; high speed rolling; rolling simulation; bar and rod rolling; free surface; finite element analysis. Includes bibliographical references (p. 69-75).
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21

Valsamis, Jean-Baptiste. "A study of liquid bridge dynamics: an application to micro-assembly." Doctoral thesis, Universite Libre de Bruxelles, 2010. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/210117.

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Micro-assembly processes suffer from some breaches due to the continuing trend towards an increase in the production capabilities as well as in the size reduction of the components manipulated. Usual manipulating schemes have reached their limit and capillary forces constitute a valuable alternative strategy.<p><p>The goal of this work is to describe the dynamics of liquid bridges in the application of micro-assembly processes. The description is obtained using the Kelvin-Voigt model, with a spring, a damper, and a mass connected in parallel, supported by numerical simulations, analytical appr
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22

Kleusberg, Elektra. "Wind turbine simulations using spectral elements." Licentiate thesis, KTH, Stabilitet, Transition, Kontroll, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-207630.

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Understanding the flow around wind turbines is a highly relevant research question due to the increased interest in harvesting energy from renewable sources. This thesis approaches the topic by means of numerical simulations using the actuator line method and the incompressible Navier–Stokes equations in the spectral element code Nek5000. The aim is to gain enhanced understanding of the wind turbine wake structure and wind turbine wake interaction. A verification study of the method and implementation is performed against the finite volume solver EllipSys3D using two types of turbines, an idea
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23

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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24

Lovón, Oscar Bayardo Ramos. "Formulação h-adaptativa do método dos elementos de contorno para elasticidade bidimensional com ênfase na propagação da fratura." Universidade de São Paulo, 2006. http://www.teses.usp.br/teses/disponiveis/18/18134/tde-25092006-092346/.

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Neste trabalho desenvolveu-se uma formulação adaptativa do método de elementos de contorno (MEC) para a análise de problemas de fratura elástica linear. Foi utilizado o método da colocação para a formulação das equações integrais de deslocamento e de tensão. Para a discretização das equações integrais foram utilizados elementos lineares que possibilitaram a obtenção das expressões exatas das integrais (integração analítica) sobre elementos de contorno e fratura. Para a montagem do sistema de equações algébricas foram utilizadas apenas equações de deslocamento, apenas equações de forças de supe
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25

Oudich, Hamza. "Analytical Investigation of Planetary Gears Instabilities and the Impact of Micro-Macro Geometry Modifications." Thesis, KTH, Farkostteknik och Solidmekanik, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-276775.

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Due to their large torque-speed ratio and transmission efficiency, planetary gears are widely used in the automotive industry. However, high amplitude vibrations remain their critical weakness, which limits their usage especially when new strict noise legislations come into action. A new approach to handle the instability problems of planetary gears encountered in real industrial context is presented in this work. First, the dynamic response of a planetary gear failing to pass the noise regulations is theoretically investigated through an analytical model. The equations of motion were solved u
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26

Eicholtz, Matthew R. "Design and analysis of an inertial properties measurement device for manual wheelchairs." Thesis, Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34677.

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The dynamics of rigid body motion are dependent on the inertial properties of the body - that is, the mass and moment of inertia. For complex systems, it may be necessary to derive these results empirically. Such is the case for manual wheelchairs, which can be modeled as a rigid body frame connected to four wheels. While 3D modeling software is capable of estimating inertial parameters, modeling inaccuracies and ill-defined material properties may introduce significant errors in this estimation technique and necessitate experimental measurements. To that end, this thesis discusses the design
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27

Saloustros, Savvas. "Tracking localized cracks in the computational analysis of masonry structures." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461714.

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Numerical methods aid significantly the engineering efforts towards the conservation of existing masonry structures and the design of new ones. Among them, macro-mechanical finite element methods based on the smeared crack approach are commonly preferred as an affordable choice for the analysis of large masonry structures. Nevertheless, they usu-ally result in a non-realistic representation of damage as smeared over large areas of the structure, which hampers the correct interpretation of the damage pattern. Additionally, a more critical pathology of this approach is the mesh-dependency, which
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28

Bourasseau, Sébastien. "Contribution à une méthode de raffinement de maillage basée sur le vecteur adjoint pour le calcul de fonctions aérodynamiques." Thesis, Nice, 2015. http://www.theses.fr/2015NICE4138/document.

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L’adaptation de maillage est un outil puissant pour l’obtention de simulations aérodynamiques précises à coût limité. Dans le cas particulier des simulations visant au calcul de fonctions aérodynamiques (efforts, moments, rendements...), plusieurs méthodes dites de raffinement ciblé (ou, en anglais, « goal-oriented ») basées sur le vecteur adjoint de la fonction d’intérêt ont été proposées. L’objectif de la thèse est l’extension d’une méthode de ce type basée sur la dérivée totale dJ/dX de la grandeur aérodynamique d’intérêt, J, par rapport aux coordonnées du maillage volumique, X. Les trois m
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Nguyen-Dinh, Maxime. "Qualification des simulations numériques par adaptation anisotropique de maillages." Phd thesis, Université Nice Sophia Antipolis, 2014. http://tel.archives-ouvertes.fr/tel-00987202.

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La simulation numérique est largement utilisée pour évaluer les performances aérodynamiques des aéronefs ainsi qu'en optimisation de forme. Ainsi l'objectif de ces simulations est souvent le calcul de fonctions aérodynamiques. L'objet de cette thèse est d'étudier des méthodes d'adaptation de maillages basées sur la dérivée totale de ces fonctions par rapport aux coordonnées du maillage (notée dJ/dX). Celle-ci pouvant être calculée par la méthode adjointe discrète. La première partie de cette étude concerne l'application de méthodes d'adaptation de maillages appliquées à des écoulements de flui
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Jan, Yannick. "Modélisation de la propagation de fissure sur des structures minces, soumises à des sollicitations intenses et rapides, par la méthode X-FEM." Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI066/document.

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Actuellement, les méthodes classiques (éléments finis, endommagement, critère de rupture) pour analyser la tenue des structures sous des chargements extrêmes sont très dépendantes de la taille de maille du modèle et nécessitent à la fois un savoir-faire spé- cifique dans le domaine et des études de sensibilité au maillage. De nouvelles approches basées sur la méthode des éléments finis étendus permettent de traiter des propagations de fissure sur des structures de petites tailles et volumiques. Cependant, la propagation sur de grandes longueurs avec des modèles volumiques demande une puissance
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31

Lu, Yu-Yu. "Experimental Study of Installation Effects on Cooling Fan Noise." Thesis, KTH, Marcus Wallenberg Laboratoriet MWL, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-302269.

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Owing to the ever-changing developments of battery and electric powertrain, vehicle electrification is the trend in the future. Without the presence of a combustion engine, masking effect from it reduces and noises from other components become perceivable. Among all, the cooling fan is one of the major noise sources. The design of cooling fan modules is usually carried out in the early stage before building prototype vehicles. Therefore, it is essential to come up with a method for selecting optimal fan design without performing complete vehicle testing. This is a Master's degree project in co
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32

Leitão, Franklin Delano Cavalcanti. "Métodos sem malha: aplicações do Método de Galerkin sem elementos e do Método de Interpolação de Ponto em casos estruturais." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8611.

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Apesar de serem intensamente estudados em muitos países que caminham na vanguarda do conhecimento, os métodos sem malha ainda são pouco explorados pelas universidades brasileiras. De modo a gerar uma maior difusão ou, para a maioria, fazer sua introdução, esta dissertação objetiva efetuar o entendimento dos métodos sem malha baseando-se em aplicações atinentes à mecânica dos sólidos. Para tanto, são apresentados os conceitos primários dos métodos sem malha e o seu desenvolvimento histórico desde sua origem no método smooth particle hydrodynamic até o método da partição da unidade, sua forma ma
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33

Noël, Frédéric. "Mailleur auto-adaptatif pour des surfaces gauches en vue de la conception intégrée." Grenoble INPG, 1994. http://www.theses.fr/1994INPG0110.

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Les sciences de l'ingenieur font souvent appel a des maillages. Cette representation geometrique demeure difficile a controler lorsque le domaine maille correspond a une surface gauche. Reposant sur un lien efficace entre un maillage et un modele geometrique (base sur un formalisme de type non uniform rational b-spline), cette etude propose des outils de manipulation geometrique ou topologique des maillages surfaciques. Elle met aussi en evidence des problemes inherents a la liaison c. A. O. -calculs de structures et indique des outils de base pour la gestion de ces problemes. Sans necessiter
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34

Barbié, Laureline. "Raffinement de maillage multi-grille local en vue de la simulation 3D du combustible nucléaire des Réacteurs à Eau sous Pression." Thesis, Aix-Marseille, 2013. http://www.theses.fr/2013AIXM4742.

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Le but de cette étude est d'améliorer les performances, en termes d'espace mémoire et de temps de calcul, des simulations actuelles de l'Interaction mécanique Pastille-Gaine (IPG), phénomène complexe pouvant avoir lieu lors de fortes montées en puissance dans les réacteurs à eau sous pression. Parmi les méthodes de raffinement de maillage, méthodes permettant de simuler efficacement des singularités locales, une approche multi-grille locale a été choisie car elle présente l'intérêt de pouvoir utiliser le solveur en boîte noire tout en ayant un faible nombre de degrés de liberté à traiter par n
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Rigon, Daniele. "Development and assessment of energy methods for structural durability." Doctoral thesis, Università degli studi di Padova, 2019. http://hdl.handle.net/11577/3423171.

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Fatigue life assessment is the key task of the design of mechanical components subjected to service loads for avoiding failure occurring in the form of incipient cracks which may cause damages to the entire mechanical system or even worse to people. The nowadays industrial applications increasingly require mechanical components having complex geometry subjected to complex loading conditions. Considering the guidelines of the fatigue design of welded joints as an example, the standards report several stress-based fatigue design curves each one related to the most common welded structural deta
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Gibert, Gaël. "Propagation de fissures en fatigue par une approche X-FEM avec raffinement automatique de maillage." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEI088.

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Dans cette thèse, une nouvelle approche est présentée, combinant la méthode des éléments finis étendus (X-FEM) et un raffinement adaptatif et automatique de maillage (AMR). La méthode X-FEM, développée durant les deux dernières par une importante communauté, a prouvé son efficacité pour gérer l'évolution de discontinuités dans de nombreux problèmes de mécanique de la rupture. Comme cette méthode permet de décrire la fissure indépendamment du maillage de la structure, un raffinement hiérarchique relativement simple peut être appliqué sur ce dernier pour adapter localement l'échelle de discrétis
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Hamzaoui, Idir. "Effet de la convection naturelle et forcée lors des transitions de phases : Application à la croissance cristalline." Electronic Thesis or Diss., Lyon, 2019. http://www.theses.fr/2019LYSEI132.

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L'influence de la convection naturelle lors du changement de phase solide-liquide est traitée dans ce travail de thèse. La configuration géométrique considérée tout au long de cette étude à été choisie de manière à correspondre au creuset du montage expérimental de référence 'Afrodite'. Différents modèles numériques (3D,2D et 2D1/2) ont été proposés pour traiter des cas de convection naturelle, de changement de phase solide-liquide de corps pur et de solidification avec ségrégation d'alliages métalliques. L'incapacité des modèles 2D classiques, qui ne prennent pas en considération la dissipati
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Altaie, Huda. "Nouvelle technique de grilles imbriquées pour les équations de Saint-Venant 2D." Thesis, Université Côte d'Azur (ComUE), 2018. http://www.theses.fr/2018AZUR4220/document.

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Les écoulements en eau peu profonde se rencontrent dans de nombreuses situations d’intérêts : écoulements de rivières et dans les lacs, mais aussi dans les mers et océans (courants de marée, tsunami, etc.). Ils sont modélisés par un système d’équations aux dérivées partielles, où les inconnues sont la vitesse de l’écoulement et la hauteur d’eau. On peut supposer que la composante verticale de la vitesse est petite devant les composantes horizontales et que ces dernières sont indépendantes de la profondeur. Le modèle est alors donné par les équations de shallow water (SWEs). Cette thèse se conc
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Nguyen, Tien Anh. "Instrumentation électronique et diagnostic de modules de puissance à semi-conducteur." Phd thesis, École normale supérieure de Cachan - ENS Cachan, 2013. http://tel.archives-ouvertes.fr/tel-00910357.

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Les objectifs de la thèse sont d'élaborer des systèmes d'instrumentation électronique qui permettent une analyse et un diagnostic fins de l'état d'intégrité et du processus de vieillissement des composants de puissance à semi-conducteur. Ces travaux visent à évaluer la variation de la conductivité de la métallisation à l'aide de capteurs à Courant Foucault (CF) mais aussi à estimer l'effet du vieillissement des puces et de leur assemblage sur la distribution de courant dans les puces afin de mieux comprendre les mécanismes de défaillance. Des éprouvettes simplifiées mais également des modules
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Beckstein, Pascal. "Methodenentwicklung zur Simulation von Strömungen mit freier Oberfläche unter dem Einfluss elektromagnetischer Wechselfelder." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-232474.

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Im Bereich der industriellen Metallurgie und Kristallzüchtung treten bei zahlreichen Anwendungen, wo magnetische Wechselfelder zur induktiven Beeinflussung von leitfähigen Werkstoffen eingesetzt werden, auch Strömungen mit freier Oberfläche auf. Das Anwendungsspektrum reicht dabei vom einfachen Aufschmelzen eines Metalls in einem offenen Tiegel bis hin zur vollständigen Levitation. Auch der sogenannte RGS-Prozess, ein substratbasiertes Kristallisationsverfahren zur Herstellung siliziumbasierter Dünnschichtmaterialien, ist dafür ein Beispiel. Um bei solchen Prozessen die Interaktion von Magnetf
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Dai, Meizhong. "Numerical simulation of free surface flow using a moving, unstructured mesh method." 2005. https://scholarworks.umass.edu/dissertations/AAI3193893.

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An unstructured, three-dimensional, moving-mesh algorithm is developed for free-surface flow simulations with large deformations. This method moves the surface mesh to follow the free surface in a Lagrangian manner, therefore it can exactly track the evolving surface. In order to simulate large deformation and maintain good mesh quality at the same time, robust mesh reconnection and smoothing algorithms are implemented. The mesh reconnection algorithm performs local topological changes to improve the quality of a structure of several tetrahedra sharing a common edge. A dynamic programming tech
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Rajathachal, Karthik M. "Application Of Polynomial Reproducing Schemes To Nonlinear Mechanics." Thesis, 2009. https://etd.iisc.ac.in/handle/2005/1093.

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The application of polynomial reproducing methods has been explored in the context of linear and non linear problems. Of specific interest is the application of a recently developed reproducing scheme, referred to as the error reproducing kernel method (ERKM), which uses non-uniform rational B-splines (NURBS) to construct the basis functions, an aspect that potentially helps bring in locall support, convex approximation and variation diminishing properties in the functional approximation. Polynomial reproducing methods have been applied to solve problems coming under the class of a simplified
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Rajathachal, Karthik M. "Application Of Polynomial Reproducing Schemes To Nonlinear Mechanics." Thesis, 2009. http://hdl.handle.net/2005/1093.

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The application of polynomial reproducing methods has been explored in the context of linear and non linear problems. Of specific interest is the application of a recently developed reproducing scheme, referred to as the error reproducing kernel method (ERKM), which uses non-uniform rational B-splines (NURBS) to construct the basis functions, an aspect that potentially helps bring in locall support, convex approximation and variation diminishing properties in the functional approximation. Polynomial reproducing methods have been applied to solve problems coming under the class of a simplified
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Kyle, Jonathan Paul. "The Rheology of Nanoparticle Additives: An Investigation Utilizing Mesh Free Methods." Thesis, 2014. https://doi.org/10.7916/D8610XW2.

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This dissertation applies mesh free computational methods to investigate the rheological impact of arbitrarily shaped nanoparticle additives in shearing interfaces. Specifically, Smoothed Particle Hydrodynamics is used for its flexibility in modeling moving fluid-structure interfaces, the ability to model non-Newtonian fluids, as well as having the capability to add any additional physics deemed appropriate. With this modeling technique, a sufficient theory for the non-Einstein like rheological modification seen with certain nanoparticle additives is achieved based on surface tension effects b
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Singh, Manish Kumar. "Implicit Gradient Reconstruction for Unstructured Mesh Finite Volume Method." Thesis, 2022. https://etd.iisc.ac.in/handle/2005/5934.

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In the present work, an Implicit Gradient Reconstruction (IGR) method is proposed in the context of Finite Volume Methodology (FVM). There are three computationally intensive steps involved in a typical finite volume framework for a spatially second-order accurate upwind scheme. These are solution reconstruction, solution limiting and flux finding. Solution re- construction involves determination of gradients while solution limiting requires comparison of double precision numbers. Further, computation of gradient and solution limiting is cell based procedure while flux finding is edge/fa
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"A Mesh-Free Finite Element Solution for Unilateral Contact Problems." Doctoral diss., 2010. http://hdl.handle.net/2286/R.I.8783.

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abstract: Current trends in the Computer Aided Engineering (CAE) involve the integration of legacy mesh-based finite element software with newer solid-modeling kernels or full CAD systems in order to simplify laborious or highly specialized tasks in engineering analysis. In particular, mesh generation is becoming increasingly automated. In addition, emphasis is increasingly placed on full assembly (multi-part) models, which in turn necessitates an automated approach to contact analysis. This task is challenging due to increases in algebraic system size, as well as increases in the number of
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Cartwright, BK. "The study of ship motions in regular waves using a mesh-free numerical method." Thesis, 2012. https://eprints.utas.edu.au/15896/1/front-_Cartwright-thesis.pdf.

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Mesh-free methods are becoming popular in the maritime engineering fields for their ability to handle non-benign fluid flows. Predictions of ship motions made using mesh-free methods need to be validated for benign conditions, such as regular waves, before progressing to nonbenign conditions. This thesis aims to validate the response of a ship in regular waves by the Smoothed Particle Hydrodynamics (SPH) mesh-free method. Specifically, the SPH technique uses a set of interpolation points, designated SPH particles, located at nodes that track the centre of discrete fluid volumes with time
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Graça, Ana Augusta Bernardo da. "Meshless methods for nonlinear continuum mechanics." Doctoral thesis, 2018. http://hdl.handle.net/10773/24098.

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In the past two decades, meshless methods have been successfully implemented to solve numerous problems in engineering and science. The main characteristic of these methods is that the approximation functions do not require an established node connectivity (mesh) as is the case with Finite Element Methods (FEM). This new class of methods has shown great potential in the situations where the mesh becomes a critical issue. For instance, in the presence of large deformations, sometimes it is necessary to rede ne the mesh during simulation. Remeshing represents additional computational cos
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Tsan-LinHsu and 許璨麟. "Procedure for the Estimation of Fracture Mechanics Parameters by Using Finite Element Method with Free Meshes." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/v76n53.

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碩士<br>國立成功大學<br>機械工程學系<br>105<br>A numerical procedure based on the virtual crack closure technique (VCCT) is developed to post-process finite element solutions for calculating the fracture mechanics parameters including the strain energy release rate and the stress intensity factors. A basic requirement in applying the VCCT is the satisfaction of the self-similar growth assumption. For the cases of the three-dimensional problem, the requirement is typically met by restricting the elements in front of and behind the crack tip to be rectangular and of the same size, for which the implementation
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Nakayama, Haruka. "Application of Dynamic Mesh Method in CFD to Engineering Designs of Needle-Free Liquid Jet Injector and Diaphragm-less Shock Tube." Thesis, 2013. http://spectrum.library.concordia.ca/977593/1/Nakayama_MASc_final.pdf.

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Many engineering devices have dynamic components and hence, their computational models are no longer fixed in space and time. In these cases, dynamic mesh method is often applied to analyze their motion or unsteady fluid dynamics around/inside them. This study deals with the engineering application of CFD particularly using dynamic mesh methods to simulate firstly the compressible transient flow in a needle-less liquid jet injector for biomedical application and secondly, the performance of a diaphragm-less shock tube design for investigation of high-speed compressible gas dynamics. The CFD so
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