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Relevant bibliographies by topics / Parallel numerical computing / Dissertations / Theses

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Dissertations / Theses on the topic 'Parallel numerical computing'

Author: Grafiati

Published: 5 June 2025

Last updated: 16 July 2025

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1

Yang, Yong. "Efficient parallel genetic algorithms applied to numerical optimisation." Thesis, Southampton Solent University, 2008. http://ssudl.solent.ac.uk/631/.

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This research is concerned with the optimisation of multi-modal numerical problems using genetic algorithms (GAs). GAs use randomised operators operating over a population of candidate solutions to generate new points in the search space. As the scale and complexity of target applications increase, run time becomes a major inhibitor. Parallel genetic algorithms (PGAs) have therefore become an important area of research. Coarse-grained implementations are one of the most popular models and many researchers are concerned primarily with this area. The island model was the only one class of parall

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2

Albaiz, Abdulaziz (Abdulaziz Mohammad). "MPI-based scalable computing platform for parallel numerical application." Thesis, Massachusetts Institute of Technology, 2014. http://hdl.handle.net/1721.1/95562.

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Thesis: S.M., Massachusetts Institute of Technology, Computation for Design and Optimization Program, 2014.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (page 61).<br>Developing parallel numerical applications, such as simulators and solvers, involves a variety of challenges in dealing with data partitioning, workload balancing, data dependencies, and synchronization. Many numerical applications share the need for an underlying parallel framework for parallelization on multi-core/multi-machine hardware. In this thesis, a computing platform for parallel numeri

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3

Kumar, Ravi R. "NUMERICAL INVESTIGATION AND PARALLEL COMPUTING FOR THERMAL TRANSPORT MECHANISM DURING NANOMACHINING." UKnowledge, 2007. http://uknowledge.uky.edu/gradschool_theses/425.

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Nano-scale machining, or Nanomachining is a hybrid process in which the total thermal energy necessary to remove atoms from a work-piece surface is applied from external sources. In the current study, the total thermal energy necessary to remove atoms from a work-piece surface is applied from two sources: (1) localized energy from a laser beam focused to a micron-scale spot to preheat the work-piece, and (2) a high-precision electron-beam emitted from the tips of carbon nano-tubes to remove material via evaporation/sublimation. Macro-to-nano scale heat transfer models are discussed for underst

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4

Baladron, Pezoa Javier. "Exploring the neural codes using parallel hardware." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00847333.

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The aim of this thesis is to understand the dynamics of large interconnected populations of neurons. The method we use to reach this objective is a mixture of mesoscopic modeling and high performance computing. The rst allows us to reduce the complexity of the network and the second to perform large scale simulations. In the rst part of this thesis a new mean eld approach for conductance based neurons is used to study numerically the eects of noise on extremely large ensembles of neurons. Also, the same approach is used to create a model of one hypercolumn from the primary visual cortex where

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5

Dias, dos Santos Jose. "Implementation and comparison of numerical algorithms for the solution of linear systems using transputer networks." Thesis, University of Kent, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.256255.

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6

Eisenlohr, John Merrick. "Parallel ILU Preconditioning for Structured Grid Matrices." The Ohio State University, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=osu1429820221.

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7

Karaismail, Ertan. "Numerical Simulation Of Radiating Flows." Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12606452/index.pdf.

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Predictive accuracy of the previously developed coupled code for the solution of the time-dependent Navier-Stokes equations in conjunction with the radiative transfer equation was first assessed by applying it to the prediction of thermally radiating, hydrodynamically developed laminar pipe flow for which the numerical solution had been reported in the literature. The effect of radiation on flow and temperature fields was demonstrated for different values of conduction to radiation ratio. It was found that the steady-state temperature predictions of the code agree well with the benchmark solut

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8

Tarhan, Tanil. "Numerical Simulation Of Laminar Reacting Flows." Phd thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/2/12605307/index.pdf.

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Novel sequential and parallel computational fluid dynamic (CFD) codes based on method of lines (MOL) approach were developed for the numerical simulation of multi-component reacting flows using detailed transport and thermodynamic models. Both codes were applied to the prediction of a confined axisymmetric laminar co-flowing methane-air diffusion flame for which experimental data were available in the literature. Flame-sheet model for infinite-rate chemistry and one-, two-, and five- and ten-step reduced finite-rate reaction mechanisms were employed for methane-air combustion sub-model. A seco

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9

Kazazakis, Nikolaos. "Parallel computing, interval derivative methods, heuristic algorithms, and their implementation in a numerical solver, for deterministic global optimization." Thesis, Imperial College London, 2016. http://hdl.handle.net/10044/1/45359.

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This thesis presents new algorithms for the deterministic global optimization of general non-linear programming problems (NLPs). It is proven that the αBB general underestimator may provide exact lower bounds on a function only if rigorous conditions are satisfied. These conditions are derived and the μ-subenergy methodology is proposed to achieve tighter αBB underestimation when they are violated. An interval lower bounding test is proposed to improve αBB lower bounds and avoid expensive algorithmic steps. Piecewise-linear relaxations (PLR) are proposed for the underestimation of general func

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10

Skjerven, Brian M. "A parallel implementation of an agent-based brain tumor model." Link to electronic thesis, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-060507-172337/.

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Thesis (M.S.) -- Worcester Polytechnic Institute.<br>Keywords: Visualization; Numerical analysis; Computational biology; Scientific computation; High-performance computing. Includes bibliographical references (p.19).

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11

Creech, Angus C. W. "A three-dimensional numerical model of a horizontal axis, energy extracting turbine : an implementation on a parallel computing system." Thesis, Heriot-Watt University, 2009. http://hdl.handle.net/10399/2243.

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In the last decade, there has been a resurgence of interest in tidal power as a renewable, and environmentally friendly source of electricity. Scotland is well placed in this regard, as the currents in the surrounding seas are primarily tidal; that is to say, driven by lunar and solar tides. Investigations into tidal streams as an energy source, their viability in particular locales, the efficient organisation of marine turbine farms, and most importantly, the effect of such farms on the environment, demand the use of computational fluid dynamics for effective modelling. They also require a tu

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12

Tristanto, Indi Himawan. "A mesh transparent numerical method for large-eddy simulation of compressible turbulent flows." Thesis, Loughborough University, 2004. https://dspace.lboro.ac.uk/2134/12128.

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A Large Eddy-Simulation code, based on a mesh transparent algorithm, for hybrid unstructured meshes is presented to deal with complex geometries that are often found in engineering flow problems. While tetrahedral elements are very effective in dealing with complex geometry, excessive numerical diffusion often affects results. Thus, prismatic or hexahedral elements are preferable in regions where turbulence structures are important. A second order reconstruction methodology is used since an investigation of a higher order method based upon Lele's compact scheme has shown this to be impractical

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13

Zhang, Jingwei. "Numerical Methods for the Chemical Master Equation." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/30018.

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The chemical master equation, formulated on the Markov assumption of underlying chemical kinetics, offers an accurate stochastic description of general chemical reaction systems on the mesoscopic scale. The chemical master equation is especially useful when formulating mathematical models of gene regulatory networks and protein-protein interaction networks, where the numbers of molecules of most species are around tens or hundreds. However, solving the master equation directly suffers from the so called "curse of dimensionality" issue. This thesis first tries to study the numerical properties

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14

Delgado, Javier. "Scheduling Medical Application Workloads on Virtualized Computing Systems." FIU Digital Commons, 2012. http://digitalcommons.fiu.edu/etd/633.

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This dissertation presents and evaluates a methodology for scheduling medical application workloads in virtualized computing environments. Such environments are being widely adopted by providers of “cloud computing” services. In the context of provisioning resources for medical applications, such environments allow users to deploy applications on distributed computing resources while keeping their data secure. Furthermore, higher level services that further abstract the infrastructure-related issues can be built on top of such infrastructures. For example, a medical imaging service can allow m

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15

Chen, Yung-Yu. "A Multi-Physics Software Framework on Hybrid Parallel Computing for High-Fidelity Solutions of Conservation Laws." The Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1313000975.

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16

Rahimian, Abtin. "Parallel algorithms for direct blood flow simulations." Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43611.

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Fluid mechanics of blood can be well approximated by a mixture model of a Newtonian fluid and deformable particles representing the red blood cells. Experimental and theoretical evidence suggests that the deformation and rheology of red blood cells is similar to that of phospholipid vesicles. Vesicles and red blood cells are both area preserving closed membranes that resist bending. Beyond red blood cells, vesicles can be used to investigate the behavior of cell membranes, intracellular organelles, and viral particles. Given the importance of vesicle flows, in this thesis we focus in efficient

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17

Van, Huyssteen Salomon Stephanus. "Parallel paradigms in optimal structural design." Thesis, Stellenbosch : Stellenbosch University, 2011. http://hdl.handle.net/10019.1/18017.

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Thesis (MScEng)--Stellenbosch University, 2011.<br>ENGLISH ABSTRACT: Modern-day processors are not getting any faster. Due to the power consumption limit of frequency scaling, parallel processing is increasingly being used to decrease computation time. In this thesis, several parallel paradigms are used to improve the performance of commonly serial SAO programs. Four novelties are discussed: First, replacing double precision solvers with single precision solvers. This is attempted in order to take advantage of the anticipated factor 2 speed increase that single precision computations hav

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18

Navarrete, Nelson Leonardo Vidaurre. "Paralelização de um modelo global de previsão do tempo em malhas localmente refinadas." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/45/45132/tde-23032015-110916/.

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O objetivo principal deste trabalho é a paralelização de um modelo global de previsão do tempo em diferenças finitas com refinamento local. Este é baseado nas equações primitivas, e faz uso de uma discretização semi-Lagrangiana e semi-implícita em três níveis no tempo em uma malha de Lorenz na vertical e uma malha do tipo C de Arakawa na horizontal. A discretização horizontal é feita através de diferenças finitas de segunda ordem. A equação escalar elíptica tridimensional resultante é desacoplada em um sistema de equações bidimensionais do tipo Helmholtz, o qual é resolvido por meio de um méto

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19

He, Hao. "Numerical simulations of unsteady flows in a pulse detonation engine by the conservation element and solution element method." Columbus, Ohio : Ohio State University, 2006. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1141850240.

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20

Estácio, Leonardo Bravo. "Sobre a escolha da relaxação e ordenação das projeções no método de Kaczmarz com ênfase em implementações altamente paralelas e aplicações em reconstrução tomográfica." Universidade de São Paulo, 2014. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-19092014-102033/.

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O método de Kaczmarz é um algoritmo iterativo que soluciona sistemas lineares do tipo Ax = b através de projeções sobre hiperplanos bastante usado em aplicações que envolvem a Tomografia Computadorizada. Recentemente voltou a ser destaque após a publicação de uma versão aleatória apresentada por Strohmer e Vershynin em 2009 a qual foi provada possuir taxa de convergência esperada exponencial. Posteriormente, Eldar e Needell em 2011 sugeriram uma versão modificada do algoritmo de Strohmer e Vershynin, na qual a cada iteração é selecionada a projeção ótima a partir de um conjunto aleatório, util

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21

Kaufmann, Willem. "Extended Hydrodynamics Using the Discontinuous-Galerkin Hancock Method." Thesis, Université d'Ottawa / University of Ottawa, 2021. http://hdl.handle.net/10393/42672.

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Moment methods derived from the kinetic theory of gases can be used for the prediction of continuum and non-equilibrium flows and offer numerical advantages over other methods, such as the Navier-Stokes model. Models developed in this fashion are described by first-order hyperbolic partial differential equations (PDEs) with stiff local relaxation source terms. The application of discontinuous-Galerkin (DG) methods for the solution of such models has many benefits. Of particular interest is the third-order accurate, coupled space-time discontinuous-Galerkin Hancock (DGH) method. This scheme

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22

Fakih, Bilal. "Environnement décentralisé et protocole de communication pour le calcul intensif sur grille." Thesis, Toulouse 3, 2018. http://www.theses.fr/2018TOU30179/document.

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Dans cette thèse nous présentons un environnement décentralisé pour la mise en oeuvre des calcul intensif sur grille. Nous nous intéressons à des applications dans les domaines de la simulation numérique qui font appel à des modèles de type parallélisme de tâches et qui sont résolues par des méthodes itératives parallèles ou distribuées; nous nous intéressons aussi aux problèmes de planification. Mes contributions se situent au niveau de la conception et la réalisation d'un environnement de programmation GRIDHPC. GRIDHPC permet l'utilisation de tous les ressources de calcul, c'est-à-dire de to

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23

Laukaitytė, Inga. "Construction and analysis of numerical methods for solution of laser physics and nonlinear optics problems." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100618_192503-20287.

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Mathematical models describing the Q-switched laser generation, which is a widely used laser technique for producing short intense pulses of light, belong to the class of semi-nonlinear models where only source terms nonlinearly depend on the solution. Numerical methods for solution of systems of semi-nonlinear partial differential equations have been extensively studied in many papers. Schrödinger-type equations, parabolic-type equations or general diffusion-reaction models arise in nonlinear optics. Such differential problems are solved mainly by finite-difference and Galerkin methods. The c

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24

Kilen, Isak Ragnvald, and Isak Ragnvald Kilen. "Non-Equilibrium Many-Body Influence on Mode-Locked Vertical External-Cavity Surface-Emitting Lasers." Diss., The University of Arizona, 2017. http://hdl.handle.net/10150/626375.

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Vertical external-cavity surface-emitting lasers are ideal testbeds for studying the influence of the non-equilibrium many-body dynamics on mode locking. As we will show in this thesis, ultra short pulse generation involves a marked departure from Fermi carrier distributions assumed in prior theoretical studies. A quantitative model of the mode locking dynamics is presented, where the semiconductor Bloch equations with Maxwell’s equation are coupled, in order to study the influences of quantum well carrier scattering on mode locking dynamics. This is the first work where the full model is solv

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25

Bhardwaj, Manoj K. "A CFD/CSD Interaction Methodology for Aircraft Wings." Diss., web access:, 1997. http://scholar.lib.vt.edu/theses/public/etd-91097-165322/etd-title.html.

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26

Pols, LeRoi Vincent. "Scalability of fixed-radius searching in meshless methods for heterogeneous architectures." Thesis, Stellenbosch : Stellenbosch University, 2014. http://hdl.handle.net/10019.1/96144.

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Thesis (MEng)--Stellenbosch University, 2014.<br>ENGLISH ABSTRACT: In this thesis we set out to design an algorithm for solving the all-pairs fixed-radius nearest neighbours search problem for a massively parallel heterogeneous system. The all-pairs search problem is stated as follows: Given a set of N points in d-dimensional space, find all pairs of points within a horizon distance of one another. This search is required by any nonlocal or meshless numerical modelling method to construct the neighbour list of each mesh point in the problem domain. Therefore, this work is applicable to

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27

Ondruch, Tomáš. "Akcelerace numerického výpočtu vedení tepla v tuhých tělesech v inverzních úlohách." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-401578.

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The master's thesis deals with possible ways of accelerating numerical computations, which are present in problems related to heat conduction in solids. The thesis summarizes basic characteristics of heat transfer phenomena with emphasis on heat conduction. Theoretical principles of control volume method are utilized to convert a direct heat conduction problem into a sparse linear system. Relevant fundamentals from the field of inverse heat conduction problems are presented with reference to intensive computations of direct problems of such kind. Numerical methods which are well-suited to find

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Pauthenet, Martin. "Macroscopic model and numerical simulation of elastic canopy flows." Thesis, Toulouse, INPT, 2018. http://www.theses.fr/2018INPT0072/document.

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On étudie l'écoulement turbulent d'un fluide sur une canopée, que l'on modélise comme un milieu poreux déformable. Ce milieu poreux est en fait composé d'un tapis de fibres susceptibles de se courber sous la charge hydrodynamique du fluide, et ainsi de créer un couplage fluide-structure à l'échelle d'une hauteur de fibre (honami). L'objectif de la thèse est de développer un modèle macroscopique de cette interaction fluide-structure, afin d'en réaliser des simulations numériques. Une approche numérique de simulation aux grandes échelles est donc mise en place pour capturer les grandes structure

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29

Talpaert, Arthur. "Direct Numerical Simulation of bubbles with Adaptive Mesh Refinement with Distributed Algorithms." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX016/document.

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Ce travail de thèse présente l'implémentation de la simulation d'écoulements diphasiques dans des conditions de réacteurs nucléaires à caloporteur eau, à l'échelle de bulles individuelles. Pour ce faire, nous étudions plusieurs modèles d'écoulements thermohydrauliques et nous focalisons sur une technique de capture d'interface mince entre phases liquide et vapeur. Nous passons ainsi en revue quelques techniques possibles de maillage adaptatif (AMR) et nous fournissons des outils algorithmiques et informatiques adaptés à l'AMR par patchs dont l'objectif localement la précision dans des régions

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Beltzung, Thibaud. "Simulation et modélisation des interactions fluide-structure en écoulements diphasiques Parallel geothermal numerical model with fractures and multi-branch wells." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV052.

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Les générateurs de vapeur (GV) sont l’un des com-posants majeurs des réacteurs nucléaires, et une connaissanceapprofondie de leur comportement constitue un enjeu indus-triel important aussi bien pour le concepteur AREVA-NP quepour l’exploitant EDF. Une des problématiques rencontréespour le dimensionnement des GV concerne la vibration destubes induite par l’écoulement, ce qui nécessite une évalua-tion raisonnable de la réponse des tubes à l’excitation généréepar l’écoulement. La zone identifiée comme la plus critique estla région en U (partie haute du GV) où l’écoulement est dipha-sique avec un

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31

Dao, Van Toan. "Calcul à haute performance et simulations stochastiques : Etude de la reproductibiité numérique sur architectures multicore et manycore." Thesis, Université Clermont Auvergne‎ (2017-2020), 2017. http://www.theses.fr/2017CLFAC005/document.

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La reproductibilité des expériences numériques sur les systèmes de calcul à haute performance est parfois négligée. De plus, les méthodes numériques employées pour une parallélisation rigoureuse des simulations stochastiques sont souvent méconnues. En effet, les résultats obtenus pour une simulation stochastique utilisant des systèmes de calcul à hautes performances peuvent être différents d’une exécution à l’autre, et ce pour les mêmes paramètres et les même contextes d’exécution du fait de l’impact des nouvelles architectures, des accélérateurs, des compilateurs, des systèmes d’exploitation

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Laukaitytė, Inga. "Lazerių fizikos ir netiesinės optikos ir uždavinių sprendimo metodų sudarymas ir analizė." Doctoral thesis, Lithuanian Academic Libraries Network (LABT), 2010. http://vddb.laba.lt/obj/LT-eLABa-0001:E.02~2010~D_20100618_192513-34069.

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Disertacijoje nagrinėjami kai kurių lazerių fizikos ir netiesinės optikos uždavinių skaitinės analizės metodai. Tiriami trys pagrindiniai atvejai: bėgančias plokščias bangas aprašantis vienmatis, bėgančias difraguojančias bangas nagrinėjantis dvimatis ir lazerio pluoštų sąveiką netiesinėje Kero terpėje modeliuojantis trimatis modeliai. Šiuos uždavinius sieja pernešimo diferencialinės lygtys dalinėmis išvestinėmis, aprašančios į priešingas puses sklindančias lazerio bangas. Dvimačiame ir trimačiame uždaviniuose sprendžiamos dalinių išvestinių Šrėdingerio (ang. Schrödinger) tipo diferencialinės

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Harvey, Daniel Gordon. "Efficient approaches to simulating individual-based cell population models." Thesis, University of Oxford, 2013. http://ora.ox.ac.uk/objects/uuid:95f50f05-9cf5-4c58-9115-aff7aabdfd6f.

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Computational modelling of populations of cells has been applied to further understanding in a range of biological fields, from cell sorting to tumour development. The ability to analyse the emergent population-level effects of variation at the cellular and subcellular level makes it a powerful approach. As more detailed models have been proposed, the demand for computational power has increased. While developments in microchip technology continue to increase the power of individual compute units available to the research community, the use of parallel computing offers an immediate increase in

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Zhang, Changjiang. "COMPUTER SIMULATION OF A HOLLOW-FIBER BIOREACTOR: HEPARAN REGULATED GROWTH FACTORS-RECEPTORS BINDING AND DISSOCIATION ANALYSIS." UKnowledge, 2011. http://uknowledge.uky.edu/gradschool_diss/816.

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This thesis demonstrates the use of numerical simulation in predicting the behavior of proteins in a flow environment. A novel convection-diffusion-reaction computational model is first introduced to simulate fibroblast growth factor (FGF-2) binding to its receptor (FGFR) on cell surfaces and regulated by heparan sulfate proteoglycan (HSPG) under flow in a bioreactor. The model includes three parts: (1) the flow of medium using incompressible Navier-Stokes equations; (2) the mass transport of FGF-2 using convection-diffusion equations; and (3) the cell surface binding using chemical kinetics.

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Pan, Cihui. "Diffraction électromagnétique par des réseaux et des surfaces rugueuses aléatoires : mise en œuvre deméthodes hautement efficaces pour la résolution de systèmes aux valeurs propres et de problèmesaux conditions initiales." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLV020/document.

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Dans cette thèse, nous étudions la diffraction électromagnétique par des réseau et surfaces rugueuse aléatoire. Le méthode C est une méthode exacte développée pour ce but. Il est basé sur équations de Maxwell sous forme covariante écrite dans un système de coordonnées non orthogonal. Le méthode C conduisent à résoudre le problème de valeur propre. Le champ diffusé est expansé comme une combinaison linéaire des solutions propres satisfaisant à la condition d’onde sortant.Nous nous concentrons sur l’aspect numérique de la méthode C, en essayant de développer une application efficace de cette mét

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Jérôme, Dubois. "Contribution à l'algorithmique et à la programmation efficace des nouvelles architectures parallèles comportant des accélérateurs de calcul dans le domaine de la neutronique et de la radioprotection." Phd thesis, Université des Sciences et Technologie de Lille - Lille I, 2011. http://tel.archives-ouvertes.fr/tel-00676001.

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Dans le domaine des sciences et technologies, la simulation numérique est un élément-clé des processus de recherche ou de validation. Grâce aux moyens informatiques modernes, elle permet des expérimentations numériques rapides et moins coûteuses que des maquettes réelles, sans pour autant les remplacer totalement, mais permettant de réaliser des expérimentations mieux calibrées. Dans le domaine de la physique des réacteurs et plus précisément de la neutronique, le calcul de valeurs propres est la base de la résolution de l'équation du transport des neutrons. La complexité des problèmes à résou

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Costa, Patrícia de Araújo Pereira. "Sistemas Distribuídos para Otimização por Simulação Numérica Aplicada a Modelagem de Aquíferos." Laboratório Nacional de Computação Científica, 2009. http://www.lncc.br/tdmc/tde_busca/arquivo.php?codArquivo=187.

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Neste trabalho, modela-se a ocorrência de contaminação de um aquífero hipotético por derramamento de substância tóxica e analisa-se a solução de descontaminação baseada na retirada do contaminante através de bombeamento feito por poços de extração. O projeto do sistema de remediação envolve a escolha do número de poços a serem instalados, suas localizações e vazões de modo a maximizar a quantidade de poluente extraída e ao mesmo tempo minimizar o custo total do sistema. A busca da solução ótima é feita de forma automática, através de um sistema paralelo de otimização por simulação numérica, c

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Schepke, Claudio. "Distribuição de dados para implementações paralelas do Método de Lattice Boltzmann." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2007. http://hdl.handle.net/10183/8810.

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A Dinâmica de Fluidos Computacional é uma importante área de pesquisa no contexto da Computação Científica. Através da modelagem e simulação das propriedades de líquidos e gases é possível obter resultados numéricos para diferentes estruturas e fenômenos físicos cotidianos e de grande importância econômica. A evolução dos sistemas computacionais possibilitou a essa área o surgimento de novas técnicas e abordagens de simulação. Uma das técnicas computacionais atualmente empregadas é o Método de Lattice Boltzmann, um método numérico iterativo para a modelagem e simulação mesoscópica da dinâmica

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Chaisemartin, Stéphane de. "Modèles eulériens et simulation numérique de la dispersion turbulente de brouillards qui s'évaporent." Thesis, Châtenay-Malabry, Ecole centrale de Paris, 2009. http://www.theses.fr/2009ECAP0011/document.

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Le modèle multi-fluide permet de décrire par une approche Eulérienne les sprays polydispersés et apparaît donc comme une méthode indiquée pour les applications de combustion diphasique. Sa pertinence pour la simulation à l’échelle d’applications industrielles est évaluée dans ce travail, par sa mise en oeuvre dans des configurations bi-dimensionnelle et tri-dimensionnelle plus représentatives de ce type de simulations. Cette évaluation couple une étude de faisabilité en terme de coût de calcul avec une analyse de la précision obtenue, par des comparaisons avec les résultats de méthodes de réfé

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Benmouhoub, Farah. "Optimisation de la précision numérique des codes parallèles." Thesis, Perpignan, 2022. http://www.theses.fr/2022PERP0009.

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Les nombres flottants sont utilisés à la place des nombres réels pour les calculs sur ordinateurs. L'utilisation de ces nombres introduit des erreurs d'arrondi qui sont en général acceptables dans la mesure où le résultat produit par la machine est proche de celui que l'on aurait obtenu en utilisant des nombres réels. Cependant, elles peuvent aussi être amplifiées par propagation, dénuant de sens le résultat d'un calcul, ce qui peut avoir des conséquences catastrophiques dans de nombreux domaines d'application comme par exemple l'aéronautique ou la finance. La précision des calculs en nombres

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Petri, Larissa Alves. "Simulação numérica direta de escoamento transicional sobre uma superfície contendo rugosidade." Universidade de São Paulo, 2015. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-07082015-085411/.

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Em diversos escoamentos sobre superfícies há a presença de protuberâncias, como por exemplo rebites, parafusos e juntas. Estas protuberâncias podem influenciar a camada limite, acelerando a transição do escoamento do estado laminar para o estado turbulento. Em alguns casos isto pode ser indesejável, já que o escoamento turbulento implica necessariamente em uma força de atrito maior do que aquela referente ao escoamento laminar. Existem alguns aspectos neste tipo de escoamento que ainda não estão bem compreendidos. O objetivo deste trabalho é estudar a influência de uma rugosidade isolada no es

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Schneider, Helfried, Thomas Frank, Klaus Pachler, and Klaus Bernert. "A Numerical Study of the Gas-Particle Flow in Pipework and Flow Splitting Devices of Coal-Fired Power Plant." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200348.

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In power plants using large utility coal-fired boilers for generation of electricity the coal is pulverised in coal mills and then it has to be pneumatically transported and distributed to a larger number of burners (e.g. 30-40) circumferentially arranged in several rows around the burning chamber of the boiler. Besides the large pipework flow splitting devices are necessary for distribution of an equal amount of pulverised fuel (PF) to each of the burners. So called trifurcators (without inner fittings or guiding vanes) and ''riffle'' type bifurcators are commonly used to split the gas-coal p

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Daquin, Priscillia. "Méthodes quasi-optimales pour la résolution des équations intégrales de frontière en électromagnétisme." Phd thesis, Toulouse, INPT, 2017. http://oatao.univ-toulouse.fr/19291/1/DAQUIN_Priscillia.pdf.

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Il existe une grande quantité de méthodes numériques adaptées d’une part à la modélisation, et d'autre part à la résolution des équations de Maxwell. En particulier, la méthode des éléments nis de frontière (BEM), ou méthode des Moments (MoM), semble appropriée pour la mise en équation des phénomènes de diffraction par des objets parfaitement conducteurs, en limitant le cadre de l'étude à la frontière entre l'objet diffractant et le milieu extérieur. Cette méthode mène systématiquement à la résolution d’un système linéaire dense, que nous parvenons à compresser en l'approchant numériquement pa

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Bernabeu, Llinares Miguel Oscar. "An open source HPC-enabled model of cardiac defibrillation of the human heart." Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:9ca44896-8873-4c91-9358-96744e28d187.

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Sudden cardiac death following cardiac arrest is a major killer in the industrialised world. The leading cause of sudden cardiac death are disturbances in the normal electrical activation of cardiac tissue, known as cardiac arrhythmia, which severely compromise the ability of the heart to fulfill the body's demand of oxygen. Ventricular fibrillation (VF) is the most deadly form of cardiac arrhythmia. Furthermore, electrical defibrillation through the application of strong electric shocks to the heart is the only effective therapy against VF. Over the past decades, a large body of research has

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Lachat, Cédric. "Conception et validation d'algorithmes de remaillage parallèles à mémoire distribuée basés sur un remailleur séquentiel." Phd thesis, Université Nice Sophia Antipolis, 2013. http://tel.archives-ouvertes.fr/tel-00932602.

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L'objectif de cette thèse était de proposer, puis de valider expérimentalement, un ensemble de méthodes algorithmiques permettant le remaillage parallèle de maillages distribués, en s'appuyant sur une méthode séquentielle de remaillage préexistante. Cet objectif a été atteint par étapes : définition de structures de données et de schémas de communication adaptés aux maillages distribués, permettant le déplacement à moindre coût des interfaces entre sous-domaines sur les processeurs d'une architecture à mémoire distribuée ; utilisation d'algorithmes de répartition dynamique de la charge adaptés

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Nachaoui, Mourad. "Étude théorique et approximation numérique d'un problème inverse de transfert de la chaleur." Phd thesis, Université de Nantes, 2011. http://tel.archives-ouvertes.fr/tel-00678032.

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Nous nous intéressons à l'étude d'un problème d'analyse des transferts de chaleur qui modélise une opération de soudage. L'approche que nous considérons ne s'occupe que de la partie solide de la plaque. Elle consiste à résoudre un problème à frontière libre. Pour cela, nous proposons une formulation en optimisation de forme. Le problème d'état est gouverné par un opérateur qui, pour certaines données, n'est pas coercif. Cela complique l'étude de la continuité du problème d'état. Nous surmontons cette difficulté en utilisant le degré topologique de Leray-Shauder, ainsi nous montrons l'existence

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Gratien, Jean-Marc. "A Domain Specific Embedded Language in C++ for lowest-order methods for diffusive problem on general meshes." Phd thesis, Université de Grenoble, 2013. http://tel.archives-ouvertes.fr/tel-00926232.

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La spécificité des logiciels scientifiques développés par IFP Energies nouvelles tient avant tout à l'originalité des modèles représentant les situations physiques exprimés sous forme de systèmes d'EDPs assortis de lois de fermeture complexes. Le développement de ces logiciels, conçus pour être exécutés sur les super calculateurs parallèles modernes, nécessite de combiner des méthodes volumes finis robustes et efficaces avec des technologies informatiques qui permettent de tirer au mieux parti de ces calculateurs (parallélisme, gestion de la mémoire, réseaux d'interconnexion, etc). Ces technol

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Cisternino, Marco. "A parallel second order Cartesian method for elliptic interface problems and its application to tumor growth model." Phd thesis, Université Sciences et Technologies - Bordeaux I, 2012. http://tel.archives-ouvertes.fr/tel-00690743.

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Cette thèse porte sur une méthode cartésienne parallèle pour résoudre des problèmes elliptiques avec interfaces complexes et sur son application aux problèmes elliptiques en domaine irrégulier dans le cadre d'un modèle de croissance tumorale. La méthode est basée sur un schéma aux différences fi nies et sa précision est d'ordre deux sur tout le domaine. L'originalité de la méthode consiste en l'utilisation d'inconnues additionnelles situées sur l'interface et qui permettent d'exprimer les conditions de transmission à l'interface. La méthode est décrite et les détails sur la parallélisation, ré

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Malandain, Mathias. "Simulation massivement parallèle des écoulements turbulents à faible nombre de Mach." Phd thesis, INSA de Rouen, 2013. http://tel.archives-ouvertes.fr/tel-00801502.

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L'objectif de cette thèse est l'accélération des solveurs utilisés pour la résolution de l'équation de Poisson pour la pression, dans le cas de la simulation d'écoulements à faible nombre de Mach sur des maillages non structurés. Cet objectif est complété par un besoin de stabilité, en particulier sur des géométries complexes. Plusieurs modifications de la méthode des Gradients Conjugués avec déflation ont été considérées à cet effet. Une méthode de redémarrage basée sur une estimation de l'effet des erreurs numériques a été mise en oeuvre et validée. Par la suite, une méthode consistant à cal

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Baboulin, Marc. "Résolutions rapides et fiables pour les solveurs d'algèbre linéaire numérique en calcul haute performance." Habilitation à diriger des recherches, Université Paris Sud - Paris XI, 2012. http://tel.archives-ouvertes.fr/tel-00967523.

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Dans cette Habilitation à Diriger des Recherches (HDR), nous présentons notre recherche effectuée au cours de ces dernières années dans le domaine du calcul haute-performance. Notre travail a porté essentiellement sur les algorithmes parallèles pour les solveurs d'algèbre linéaire numérique et leur implémentation parallèle dans les bibliothèques logicielles du domaine public. Nous illustrons dans ce manuscrit comment ces calculs peuvent être accélérées en utilisant des algorithmes innovants et être rendus fiables en utilisant des quantités spécifiques de l'analyse d'erreur. Nous expliquons tou

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