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Dissertations / Theses on the topic 'Vortex element method'

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Published: 3 June 2025

Last updated: 31 July 2025

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1

Vlachos, Nickolas Dimitris. "Boundary element method of incompressible flow past deforming geometries." Thesis, University of Bristol, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.297802.

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2

Farrant, Tim. "The boundary element method applied to viscous and vortex shedding flows around cylinders." Thesis, University of Southampton, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.286767.

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3

Chatelain, Philippe Leonard Anthony. "Contributions to the three-dimensional vortex element method and spinning bluff body flows /." Diss., Pasadena, Calif. : California Institute of Technology, 2005. http://resolver.caltech.edu/CaltechETD:etd-02012005-061553.

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4

Arkalgud, Ravi. "Vortex shedding analysis and control using reduced order modelling and viscous cell boundary element method." Thesis, University of Southampton, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.274099.

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5

Simmons, Scott R. "Modification of a vortex-panel method to include surface effects and allow finite-element interface." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-05022009-040717/.

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6

Pack, Alden Roy. "Computational Exploration of Vortex Nucleation in Type II Superconductors Using a Finite Element Method in Ginzburg-Landau Theory." BYU ScholarsArchive, 2017. https://scholarsarchive.byu.edu/etd/7232.

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Using a finite element method, we numerically solve the time-dependent Ginzburg-Landau equations of superconductivity to explore vortex nucleation in type II superconductors. We consider a cylindrical geometry and simulate the transition from a superconducting state to a mixed state. Using saddle-node bifurcation theory we evaluate the superheating field for a cylinder. We explore how surface roughness and thermal fluctuations influence vortex nucleation. This allows us to simulate material inhomogeneities that may lead to instabilities in superconducting resonant frequency cavities used in pa

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7

Gharakhani, Adrin. "A 3-D vortex-boundary element method for the simulation of unsteady, high Reynolds number flows." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11255.

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8

Hall, Benjamin D. "Numerical Simulations of the Aeroelastic Response of an Actively Controlled Flexible Wing." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/34087.

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A numerical simulation for evaluating methods of predicting and controlling the response of an elastic wing in an airstream is discussed. The technique employed interactively and simultaneously solves for the response in the time domain by considering the air, wing, and controller as elements of a single dynamical system. The method is very modular, allowing independent modifications to the aerodynamic, structural, or control subsystems and it is not restricted to periodic motions or simple geometries. To illustrate the technique, we use a High Altitude, Long Endurance aircraft wing. The w

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9

Proulx-Cabana, Vincent. "Algorithmes non-linéaires rapides pour l’aéroélasticité d’ailes rotatives." Electronic Thesis or Diss., Toulouse, ISAE, 2024. http://www.theses.fr/2024ESAE0001.

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Cette thèse décrit les développements d'algorithmes non-linéaires rapides pour la résolution numérique de l'aéroélasticité d'ailes rotatives. L'objectif principal de cette thèse est le développement de la méthode aérodynamique qui est ensuite couplée à un solveur structurel pour produire des simulations aéroélastiques. Pour le modèle aérodynamique, une méthode dite à fidélité médium basée sur les méthodes potentielles est choisie pour capturer des interactions aérodynamiques et des phénomènes négligée par les méthodes à basse fidélité tout en obtenant les résultats à un coût de calcul signific

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10

Wen, Quan. "A Novel Micro Fluid Kinetic Energy Harvester Based on the Vortex-Induced Vibration Principle and the Piezo Effect." Doctoral thesis, Universitätsbibliothek Chemnitz, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-184346.

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In this thesis, a miniaturized energy harvester system is developed. The energy harvester converts fluid kinetic energy into electrical energy without using any rotating components. The working principle of the energy harvester is based on the so called vortex-induced vibration. Such systems have the potential to provide energy for wireless sensor networks in the field of inline measurements for gas, oil or water transportation systems. The theoretical background of the vortex-induced vibration (VIV) is studied. Based on the studies, a fluid-structure interaction simulation is carried out to o

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11

Stewart, Eric C. "Shape and Structural Optimization of Flapping Wings." Diss., Virginia Tech, 2014. http://hdl.handle.net/10919/24808.

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This dissertation presents shape and structural optimization studies on flapping wings for micro air vehicles. The design space of the optimization includes the wing planform and the structural properties that are relevant to the wing model being analyzed. The planform design is parameterized using a novel technique called modified Zimmerman, which extends the concept of Zimmerman planforms to include four ellipses rather than two. Three wing types are considered: rigid, plate-like deformable, and membrane. The rigid wing requires no structural design variables. The structural design variables

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12

Harazim, Petr. "Dynamická analýza válcových komínů stojících za sebou." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226461.

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The diploma thesis deals with the response of a steel smokestack structure to wind loads. A detailed computational model implementing the finite element method was created in accordance with the available drawing documentation. The new smokestack was placed next to an existing one, thus it can be assumed that these two structures will affect each other. The thesis also elaborates on the problems of aerodynamic and aeroelastic stability of the earlier smokestack; in particular, the occurrence of vortex shedding in resonance with eigenfrequency of the structure, with the use of the program ANSYS

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13

Marín, Félix Ernesto Salazar. "Ferramenta computacional baseada em cluster para análise de vibração induzida por vórtices de risers verticais." reponame:Repositório Institucional da UFABC, 2016.

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Orientador: Prof. Dr. Juan Pablo Julca Ávila<br>Dissertação (mestrado) - Universidade Federal do ABC, Programa de Pós-Graduação em Engenharia Mecânica, 2016.<br>Os risers de produção são estruturas tubulares cilíndricas usadas para o escoamento de petróleo e gás desde os poços de petróleo localizados no chão marinho até uma unidade flutuante de produção de petróleo. Quando imersos em correntezas, estas estruturas vibram devido à excitação no topo, ao escoamento interno e ao desprendimento alternado de vórtices à jusante. Este fenômeno é conhecido como Vibração Induzida por Vórtices (VIV). Quan

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14

Aguirre, Miguel Angel. "Simulação numérica de tornados usando o método dos elementos finitos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2017. http://hdl.handle.net/10183/174397.

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O presente trabalho tem como objetivo estudar escoamentos de tornados e sua ação sobre corpos imersos empregando ferramentas numéricas da Engenharia do Vento Computacional (EVC). Os tornados constituem-se atualmente em uma das causas de desastres naturais no Brasil, especialmente nas regiões sul e sudeste do país, como também em alguns países vizinhos. Os efeitos gerados são geralmente localizados e de curta duração, podendo ser devastadores dependendo da escala do tornado. Tais características dificultam a realização de estudos detalhados a partir de eventos reais, o que levou ao desenvolvime

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15

VARELLO, ALBERTO. "Advanced higher-order one-dimensional models for fluid-structure interaction analysis." Doctoral thesis, Politecnico di Torino, 2013. http://hdl.handle.net/11583/2517517.

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The aim of this work is the development of a refined reduced order model suitable for numerical applications in solid and fluid mechanics with a remarkable reduction in computational cost. Nowadays, numerical reduced order models are widely exploited in many areas, such as aerospace, mechanical and biomechanical engineering for structural analysis, fluid dynamic analysis and coupled (aeroelastic) fluid-structure interaction analysis. One-dimensional (1D) structural models, commonly known as beams, are for instance used in many applications to analyze the structural behavior of slender bodies,

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16

Flatschart, Ricardo Becht. "Simulação numérica paralela do escoamento ao redor de risers." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3132/tde-23112016-101531/.

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Neste trabalho, a resposta dinâmica de um riser marítimo devido à geração e desprendimento alternado de vórtices é investigada numericamente. O riser é dividido em seções bidimensionais ao longo de seu comprimento. O Método dos Vórtices Discretos é empregado para a determinação das forças hidrodinâmicas que agem nestas seções bidimensionais. As seções hidrodinâmicas são resolvidas independentemente, e o acoplamento entre as mesmas é feito através da solução da estrutura no domínio do tempo pelo Método dos Elementos Finitos. Os resultados numéricos são comparados com resultados obtidos experime

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17

El, Anadouli Mohamed. "Étude des instabilités imparfaites de Couette-Taylor." Vandoeuvre-les-Nancy, INPL, 1994. http://www.theses.fr/1994INPL117N.

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Ce mémoire est consacré à l'étude des instabilités imparfaites de l'écoulement de Couette-Taylor en géométrie fine et à faible vitesse de rotation. Dans le premier chapitre, nous effectuons l'analyse de la stabilité linéaire pour différents rapports de rayons qui définit les paramètres critiques de l'écoulement. Pour tenir compte des effets de bords nous recourrons à l'analyse quasi-linéaire. Ces effets se traduisent par la présence du terme quadratique dans l'équation de ginzburg-landau. Ceci fait l'objet de notre deuxième chapitre. Le troisième chapitre est consacré à la description de la mé

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18

Raupp, Eduardo Mendonça. "Estudo numérico do escoamento ao redor de um cilindro oscilando." Universidade de São Paulo, 2007. http://www.teses.usp.br/teses/disponiveis/3/3150/tde-27072007-172036/.

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O objetivo deste projeto de mestrado é estudar o escoamento bidimensional ao redor de um cilindro isolado oscilando forçadamente e apoiado em base elástica através de simulações computacionais utilizando o Método de Elementos Espectrais. Este tópico suscita grande interesse no meio tecnológico, pois esta configuração aparece com bastante freqüência em estruturas marítimas, como os \"risers\" de produção e umbilicais de plataformas de exploração de petróleo, e também no meio acadêmico, uma vez que se trata do estudo de fenômenos complexos originados do escoamento ao redor de uma geometria simpl

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19

Valíček, Jan. "Statické a dynamické posouzení konstrukce vyhlídkové věže." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2013. http://www.nusl.cz/ntk/nusl-226476.

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This thesis deals with static and dynamic analysis of an lookout tower construction. For dynamic analysis a computational model in ANSYS software is created. Static analysis is performed by Scia Engineer software. Both of this software use finite element method. It is also focused on wind load determination by Eurocode 1, structural factor calculation, modal analysis and vortex shedding. Verification of selected parts according to Eurocodes is included.

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20

Buzík, Jiří. "Analýza cyklické únavy trubkového svazku vlivem proudění pracovního média." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-371777.

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The aim of the dissertation thesis is the control of the tube bundle on the cyclic fatigue caused by the flow past tube bundle. Fatigue due to flow is caused by flow-induced vibrations. Examined vibrations are caused by the mutual interaction of two phases (solid and liquid). The present work is focused mainly on the interaction of tube bundles with fluid. The current level of knowledge in this field allows to predict mainly static respectively quazi-static loading. These predictions are based on methods of comparing key vibration variables such as frequencies, amplitudes or speeds (see TEMA [

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21

Boujelben, Abir. "Géante éolienne offshore (GEOF) : analyse dynamique des pales flexibles en grandes transformations." Thesis, Compiègne, 2018. http://www.theses.fr/2018COMP2442.

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L’objectif de ce travail porte sur le développement d’un modèle d’interaction fluide-structure adapté à la dynamique des éoliennes de grandes tailles avec des pales flexibles qui se déforment de manière significative sous l’effet de la pression exercée par le vent. Le modèle développé est basé sur une approche efficace d’IFS partitionnée pour un fluide incompressible et non visqueux en interaction avec une structure flexible soumise a des grandes transformations. Il permet de fournir une meilleure estimation de la charge aérodynamique et de la réponse dynamique associée du système (pales, mat,

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22

Chatelain, Philippe. "Contributions to the Three-Dimensional Vortex Element Method and Spinning Bluff Body Flows." Thesis, 2005. https://thesis.library.caltech.edu/424/1/chatelain_thesis_onesided_linkscolor.pdf.

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<p>Several contributions to the three-dimensional vortex element method for incompressible flows are presented. We introduce redistribution schemes based on the hexagonal lattice in two dimensions, and the face-centered cubic lattice in three dimensions. Interpolation properties are studied in the frequency domain and are used to build high-order schemes that are more compact and isotropic than equivalent cubic schemes. We investigate the reconnection of vortex rings at small Reynolds numbers for a variety of configurations. In particular, we trace their dissipative nature to the formation of

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23

Tian, Ye active 21st century. "Leading edge vortex modeling and its effect on propulsor performance." Thesis, 2014. http://hdl.handle.net/2152/28344.

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A novel numerical method solves the VIScous Vorticity Equation (VISVE) in 3D in order to model the Leading Edge Vortex (LEV) of propellers is proposed and implemented in this dissertation. The spatial concentration of the vorticity is exploited in the method, which is designed to be spatially compact and numerically efficient, in the meantime, capable of modeling complicated vorticity/solid boundary interaction in 2D and 3D. The numerical model can work as a viscous correction on top of the traditional Boundary Element Method (BEM) results. The proposed method is first applied in the case of a

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24

Jang, Jia-Yiing, and 張家穎. "Numerical study of vortex behaviors of flow past an objective by spectral element method." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/23349397552724258546.

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碩士<br>雲林科技大學<br>機械工程系碩士班<br>97<br>The flow around an infinitely long circular cylinder at Reynolds number 140 is investigated, numerically by spectral element method. Flow separation, vortex growing with time, the frequency of vortex shedding oscillation, strouhal number, etc. are studied carefully and compared with several literatures. This work provide basic flow data for further researches in flow control and more advanced computational scheme, hp spectral element method.

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25

"Investigation of Transition and Vortex Systems of a Dynamically Pitching Airfoil Under the Free-stream Turbulence Conditions." Master's thesis, 2017. http://hdl.handle.net/2286/R.I.45526.

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abstract: The effect of reduced frequency on dynamic stall behavior of a pitching NACA0012 airfoil in a turbulent wake using Direct Numerical Simulations is presented in the current study. Upstream turbulence with dynamically oscillating blades and airfoils is associated with ambient flow unsteadiness and is encountered in many operating conditions. Wake turbulence, a more realistic scenario for airfoils in operation, is generated using a small solid cylinder placed upstream, the vortices shed from which interact with the pitching airfoil affecting dynamic stall behavior. A recently developed

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26

Xu, Wei 1986. "Numerical techniques for the design and prediction of performance of marine turbines and propellers." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-2020.

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The performance of a horizontal axis marine current turbine is predicted by three numerical methods, vortex lattice method MPUF-3A, boundary element method PROPCAV and a commercial RANS solver FLUENT. The predictions are compared with the experimental measurements for the same turbine model. A fully unsteady wake alignment is utilized in order to model the realistic wake geometry of the turbine. A lifting line theory based method is developed to produce the optimum circulation distribution for turbines and propellers and a lifting line theory based database searching method is used to achieve

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27

Sharma, Abhinav master of science in civil engineering. "Numerical modeling of a hydrofoil or a marine propeller undergoing unsteady motion via a panel method and RANS." Thesis, 2011. http://hdl.handle.net/2152/ETD-UT-2011-12-4830.

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A computational approach to analyze the hydrodynamic performance of a hydrofoil or a marine propeller undergoing unsteady motion has been developed. In order to simulate heave and pitch motion of a hydrofoil, an unsteady boundary element method based modeling is performed. The wake of the hydrofoil is modeled by a continuous dipole sheet and determined in time by applying a force-free condition on its surface. An explicit vortex core model is adapted in this model to capture the rolling up shape and to avoid instability due to roll-up deformation of the wake. The numerical results of the devel

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28

He, Lei doctor of civil engineering. "Numerical simulation of unsteady rotor/stator interaction and application to propeller/rudder combination." Thesis, 2010. http://hdl.handle.net/2152/ETD-UT-2010-08-1981.

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In this thesis, a numerical approach based on a potential flow method has been developed in order to simulate unsteady rotor/stator interaction, and to predict the unsteady performance of a propeller and its rudder. The method is first developed and tested in two-dimensions by using a boundary element method in which a front hydrofoil is moving downward, while a back hydrofoil is stationary. The wakes of the two hydrofoils are modeled by continuous dipole sheets and determined in time by applying a force free-condition on each wake surface. The wake/hydrofoil interaction is de-singularized b

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29

Reichert, Todd. "Kinematic Optimization in Birds, Bats and Ornithopters." Thesis, 2011. http://hdl.handle.net/1807/31913.

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Birds and bats employ a variety of advanced wing motions in the efficient production of thrust. The purpose of this thesis is to quantify the benefit of these advanced wing motions, determine the optimal theoretical wing kinematics for a given flight condition, and to develop a methodology for applying the results in the optimal design of flapping-wing aircraft (ornithopters). To this end, a medium-fidelity, combined aero-structural model has been developed that is capable of simulating the advanced kinematics seen in bird flight, as well as the highly non-linear structural deformations typic

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30

McWilliam, Michael Kenneth. "Towards multidisciplinary design optimization capability of horizontal axis wind turbines." Thesis, 2015. http://hdl.handle.net/1828/6441.

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Research into advanced wind turbine design has shown that load alleviation strategies like bend-twist coupled blades and coned rotors could reduce costs. However these strategies are based on nonlinear aero-structural dynamics providing additional benefits to components beyond the blades. These innovations will require Multi-disciplinary Design Optimization (MDO) to realize the full benefits. This research expands the MDO capabilities of Horizontal Axis Wind Turbines. The early research explored the numerical stability properties of Blade Element Momentum (BEM) models. Then developed a prov

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31

Schroeder, Philipp W. "Robustness of High-Order Divergence-Free Finite Element Methods for Incompressible Computational Fluid Dynamics." Doctoral thesis, 2019. http://hdl.handle.net/11858/00-1735-0000-002E-E5BC-8.

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32

Fluck, Manuel. "Stochastic methods for unsteady aerodynamic analysis of wings and wind turbine blades." Thesis, 2017. http://hdl.handle.net/1828/7981.

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Advancing towards `better' wind turbine designs engineers face two central challenges: first, current aerodynamic models (based on Blade Element Momentum theory) are inherently limited to comparatively simple designs of flat rotors with straight blades. However, such designs present only a subset of possible designs. Better concepts could be coning rotors, swept or kinked blades, or blade tip modifications. To be able to extend future turbine optimization to these new concepts a different kind of aerodynamic model is needed. Second, it is difficult to include long term loads (life time extreme

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