Relevant bibliographies by topics / Multiscale flow / Dissertations / Theses
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Dissertations / Theses on the topic 'Multiscale flow'

Author: Grafiati
Published: 19 October 2024

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1

Rycroft, Christopher Harley. "Multiscale modeling in granular flow." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/41557.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mathematics, 2007.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 245-254).<br>Granular materials are common in everyday experience, but have long-resisted a complete theoretical description. Here, we consider the regime of slow, dense granular flow, for which there is no general model, representing a considerable hurdle to industry, where grains and powders must frequently be manipulat
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2

Kumar, Mayank Ph D. Massachusetts Institute of Technology. "Multiscale CFD simulations of entrained flow gasification." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/69495.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references.<br>The design of entrained flow gasifiers and their operation has largely been an experience based enterprise. Most, if not all, industrial scale gasifiers were designed before it was practical to apply CFD models. Moreover, gasification CFD models developed over the years may have lacked accuracy or have not been tested over a wide range of operating conditions, gasifier geometries and feedstock compositions. One reason
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3

Basu, Debashis. "Hybrid Methodologies for Multiscale Separated Turbulent Flow Simulations." University of Cincinnati / OhioLINK, 2006. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1147362291.

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4

Hauge, Vera Louise. "Multiscale Methods and Flow-based Gridding for Flow and Transport In Porous Media." Doctoral thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for matematiske fag, 2010. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-12132.

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The topic of this thesis is fast and accurate simulation techniques used for simulations of flow and transport in porous media, in particular petroleum reservoirs. Fast and accurate simulation techniques are becoming increasingly important for reservoir management and development, as the geological models increase in size and level of detail and require more computational resources to be utilized. The multiscale framework is a promising approach to facilitate simulation of detailed geological models. In contrast to traditional upscaling approaches, the multiscale methods have the detailed geol
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5

Lamponi, Daniele. "One dimensional and multiscale models for blood flow circulation /." [S.l.] : [s.n.], 2004. http://library.epfl.ch/theses/?nr=3006.

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6

Moragues, Ginard Margarida. "Variational multiscale stabilization and local preconditioning for compressible flow." Doctoral thesis, Universitat Politècnica de Catalunya, 2016. http://hdl.handle.net/10803/384841.

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This thesis is about the stabilization of the numerical solution of the Euler and Navier- Stokes equations of compressible flow. When simulating numerically the flow equations, if no stabilization is added, the solution presents non-physical (but numerical) oscillations. For this reason the stabilization of partial differential equations and of the fluid dynamics equations is of great importance. In the framework of the so-called variational multiscale stabilization, we present here a stabilization method for compressible flow. The method assessment is done first of all on a batch of academica
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7

Hellman, Fredrik. "Multiscale and multilevel methods for porous media flow problems." Licentiate thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-262276.

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We consider two problems encountered in simulation of fluid flow through porous media. In macroscopic models based on Darcy's law, the permeability field appears as data. The first problem is that the permeability field generally is not entirely known. We consider forward propagation of uncertainty from the permeability field to a quantity of interest. We focus on computing p-quantiles and failure probabilities of the quantity of interest. We propose and analyze improved standard and multilevel Monte Carlo methods that use computable error bounds for the quantity of interest. We show that subs
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8

Dub, Francois-Xavier. "A locally conservative variational multiscale method for the simulation of porous media flow with multiscale source terms." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44874.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.<br>Includes bibliographical references (p. 75-78).<br>Multiscale phenomena are ubiquitous to flow and transport in porous media. They manifest themselves through at least the following three facets: (1) effective parameters in the governing equations are scale dependent; (2) some features of the flow (especially sharp fronts and boundary layers) cannot be resolved on practical computational grids; and (3) dominant physical processes may be different at different scales. Numerical methods should therefo
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9

Gravemeier, Volker. "The variational multiscale method for laminar and turbulent incompressible flow." [S.l. : s.n.], 2003. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11051842.

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10

Xu, Mingtian, and 許明田. "Multiscale transport of mass, momentum and energy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2002. http://hub.hku.hk/bib/B3124497X.

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11

Chernyavsky, Igor L. "A multiscale analysis of flow and transport in the human placenta." Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/13678/.

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The human placenta is characterised by a unique circulatory arrangement, with numerous villous trees containing fetal vessels immersed in maternal blood. Placental tissue therefore manifests a multiscale structure balancing microscopic delivery of nutrients and macroscopic flow. The aims of this study are to examine the interaction between these scales and to understand the influence of placental organisation on the effectiveness of nutrient uptake, which can be compromised in pathologies like pre-eclampsia and diabetes. We first systematically analyse solute transport by a unidirectional flow
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12

Sotelo, Sebastian. "Investigation of Multiscale Fluid Structure Interaction Modeling of Flow in Arterial Systems." Master's thesis, University of Central Florida, 2013. http://digital.library.ucf.edu/cdm/ref/collection/ETD/id/5704.

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The study of hemodynamic patterns in large blood vessels, such as the ascending aortic artery, brachiocephalic trunk, right carotid artery and right subclavian artery presents the challenging complexity of vessel wall compliance induced by the high levels of shear stress gradients and blood flow pulsatility. Accurate prediction of hemodynamics in such conditions requires a complete Fluid Structure Interaction (FSI) analysis that couples the fluid flow behavior throughout the cardiac cycle with the structural response of the vessel walls. This research focuses on the computational study of a Mu
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13

Donato, Adam Armido. "Multiscale Modeling and Uncertainty Quantification of Multiphase Flow and Mass Transfer Processes." Diss., Virginia Tech, 2015. http://hdl.handle.net/10919/51246.

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Most engineering systems have some degree of uncertainty in their input and operating parameters. The interaction of these parameters leads to the uncertain nature of the system performance and outputs. In order to quantify this uncertainty in a computational model, it is necessary to include the full range of uncertainty in the model. Currently, there are two major technical barriers to achieving this: (1) in many situations -particularly those involving multiscale phenomena-the stochastic nature of input parameters is not well defined, and is usually approximated by limited experimental data
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14

Dallas, Vassilios. "Multiscale structure of turbulent channel flow and polymer, dynamics in viscoelastic turbulence." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5855.

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This thesis focuses on two important issues in turbulence theory of wall-bounded flows. One is the recent debate on the form of the mean velocity profile (is it a log-law or a power-law with very weak power exponent?) and on its scalings with Reynolds number. In particular, this study relates the mean flow profile of the turbulent channel flow with the underlying topological structure of the fluctuating velocity field through the concept of critical points, a dynamical systems concept that is a natural way to quantify the multiscale structure of turbulence. This connection gives a new phenomen
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15

Wedding, William Chad. "MULTISCALE MODELING OF THE MINE VENTILATION SYSTEM AND FLOW THROUGH THE GOB." UKnowledge, 2014. https://uknowledge.uky.edu/mng_etds/11.

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The following dissertation introduces the hazard of methane buildup in the gob zone, a caved region behind a retreating longwall face. This region serves as a reservoir for methane that can bleed into the mine workings. As this methane mixes with air delivered to the longwall panel, explosive concentrations of methane will be reached. Computational fluid dynamics (CFD) is one of the many approaches to study the gob environment. Several studies in the past have researched this topic and a general approach has been developed that addresses much of the complexity of the problem. The topic of rese
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16

Sorrentino, Luigi. "Simulation and optimization of crowd dynamics using a multiscale model." Doctoral thesis, Universita degli studi di Salerno, 2012. http://hdl.handle.net/10556/318.

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2010 - 2011<br>In the last decades, the modeling of crowd motion and pedestrian .ow has attracted the attention of applied mathematicians, because of an increasing num- ber of applications, in engineering and social sciences, dealing with this or similar complex systems, for design and optimization purposes. The crowd has caused many disasters, in the stadiums during some major sporting events as the "Hillsborough disaster" occurred on 15 April 1989 at Hills- borough, a football stadium, in She¢ eld, England, resulting in the deaths of 96 people, and 766 being injured that remains the d
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17

Mwasame, P. Masafu. "Multiscale Investigation of Fundamental Rheological Phenomena in Particulate Suspensions Based on Flow-Microstructure Interactions." Thesis, University of Delaware, 2018. http://pqdtopen.proquest.com/#viewpdf?dispub=10680885.

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<p> Suspensions and dispersions are an important class of complex fluids frequently encountered in a variety of industrial processes and are prominent in many consumer products such as beauty creams and food dressing. The extensive use of suspensions can be partly attributed to their unique rheological properties such as shear-induced normal stresses, yield stress, time-dependent viscosity and shear thinning. These rheological properties are a direct result of the interplay between the suspension microstructure and flow and have consequences for material processing. The quantitative understand
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18

Sonntag, Martin [Verfasser], and X. [Akademischer Betreuer] Cheng. "Subcooled Two-Phase Flow Heat Transfer in Multiscale Systems / Martin Sonntag ; Betreuer: X. Cheng." Karlsruhe : KIT-Bibliothek, 2017. http://d-nb.info/1137264926/34.

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19

Moore, Jeffrey N. "Gene Flow and Dispersal of the Flatworm, Polycelis coronata: A Multiscale Analysis." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2869.

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We determined genetic variance and gene flow across multiple scales (reaches, headwater segments, and catchments) to examine the dispersal ability of the flatworm Polycelis coronata along the Wasatch Mountains of Utah. Multiple models predict patterns of genetic differentiation in stream invertebrates based on dispersal traits and the spatial connectivity of the habitat. The stream hierarchy model predicts genetic differentiation to be low and gene flow to be high between reaches nested in segments, moderate among segments within catchments, and differentiation to be highest and gene flow lowe
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20

Sviercoski, Rosangela. "Multiscale Analytical Solutions and Homogenization of n-Dimensional Generalized Elliptic Equations." Diss., The University of Arizona, 2005. http://hdl.handle.net/10150/194912.

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In this dissertation, we present multiscale analytical solutions, in the weak sense, to the generalized Laplace's equation in Ω ⊂ Rⁿ, subject to periodic and nonperiodic boundary conditions. They are called multiscale solutions since they depend on a coefficient which takes a wide possible range of scales. We define forms of nonseparable coefficient functions in Lᵖ(Ω) such that the solutions are valid for the periodic and nonperiodic cases. In the periodic case, one such solution corresponds to the auxiliary cell problem in homogenization theory. Based on the proposed analytical solution, we w
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21

Xu, Ying. "TWO-DIMENSIONAL SIMULATION OF SOLIDIFICATION IN FLOW FIELD USING PHASE-FIELD MODEL|MULTISCALE METHOD IMPLEMENTATION." Lexington, Ky. : [University of Kentucky Libraries], 2006. http://lib.uky.edu/ETD/ukymeen2006d00524/YingXu_Dissertation_2006.pdf.

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Thesis (Ph. D.)--University of Kentucky, 2006.<br>Title from document title page (viewed on January 25, 2007). Document formatted into pages; contains: xiii, 162 p. : ill. (some col.). Includes abstract and vita. Includes bibliographical references (p. 151-157).
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22

Choi, Jiwoong. "Multiscale numerical analysis of airflow in CT-based subject specific breathing human lungs." Diss., University of Iowa, 2011. https://ir.uiowa.edu/etd/2685.

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An imaging-based computational framework for simulation of airflow in subject specific breathing human lungs is established. The three-dimensional (3D) airways of up to 9 generations and lobes are segmented and reconstructed from computed tomography (CT) images. Beyond the CT-resolved 3D airways, a volume filling method is applied to generate the one-dimensional (1D) conducting airway tree that bridges the central airway with the lung parenchyma. Through 3D-1D airway coupling, a novel image-registration-based boundary condition (BC) is proposed to derive physiologically-consistent regional ven
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23

Franc, Jacques. "Two-phase flow properties upscaling in heterogeneous porous media." Phd thesis, Toulouse, INPT, 2018. http://oatao.univ-toulouse.fr/21684/1/FRANC_Jacques.pdf.

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The groundwater specialists and the reservoir engineers share the same interest in simulating multiphase flow in soil with heterogeneous intrinsic properties. They also both face the challenge of going from a well-modeled micrometer scale to the reservoir scale with a controlled loss of information. This upscaling process is indeed worthy to make simulation over an entire reservoir manageable and stochastically repeatable. Two upscaling steps can be defined: one from the micrometer scale to the Darcy scale, and another from the Darcy scale to the reservoir scale. In this thesis, a new second u
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24

Ginting, Victor Eralingga. "Computational upscaled modeling of heterogeneous porous media flow utilizing finite volume method." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/2242.

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In this dissertation we develop and analyze numerical method to solve general elliptic boundary value problems with many scales. The numerical method presented is intended to capture the small scales effect on the large scale solution without resolving the small scale details, which is done through the construction of a multiscale map. The multiscale method is more effective when the coarse element size is larger than the small scale length. To guarantee a numerical conservation, a finite volume element method is used to construct the global problem. Analysis of the multiscale method is separatel
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25

Su, Guanyu Ph D. Massachusetts Institute of Technology. "Thermohydraulics and suppression of nucleate boiling in upward two-phase annular flow : probing multiscale physics by innovative diagnostics." Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/119035.

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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Nuclear Science and Engineering, 2018.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis.<br>Includes bibliographical references (pages 176-181).<br>In the fuel assemblies of a boiling water reactor (BWR) the steam quality increases along the assembly's length as heat is transferred from the fuel rods to the water coolant. Nucleate boiling is the dominant heat transfer m
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26

Gravemeier, Volker [Verfasser]. "The variational multiscale method for laminar and turbulent incompressible flow / Institut für Baustatik der Universität Stuttgart. Von Volker Gravemeier." Stuttgart : Inst. für Baustatik, 2004. http://d-nb.info/970314418/34.

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27

Prigent, Simon. "Flow structure and coherence in the wake of a lifting wing with multiscale sinusoidal cut-in trailing edge serrations." Thesis, Imperial College London, 2017. http://hdl.handle.net/10044/1/50179.

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This thesis presents an experimental investigation into the wake of a lifting wing with multiscale cut-in trailing edge serrations. More specifically, it looks into how the wake is affected by the serration patterns, both in terms of mean properties and dynamic and spectral information. The flow is investigated by means of particle image velocimetry and hot-wire anemometry to combine the dynamic and spatial strengths of the two experimental techniques. The response of a wing fitted with such serrations and subjected to unsteady inflows is studied by means of lift measurement and hot-wire anemo
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28

Erson, E. Zeynep. "Development, Integration and Simulation of Multiscale Mathematical Models of Physiological Processes: A Software Engineering Perspective." Case Western Reserve University School of Graduate Studies / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=case1289789036.

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29

Alvino, Christopher Vincent. "Multiscale Active Contour Methods in Computer Vision with Applications in Tomography." Diss., Georgia Institute of Technology, 2005. http://hdl.handle.net/1853/6896.

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Most applications in computer vision suffer from two major difficulties. The first is they are notoriously ridden with sub-optimal local minima. The second is that they typically require high computational cost to be solved robustly. The reason for these two drawbacks is that most problems in computer vision, even when well-defined, typically require finding a solution in a very large high-dimensional space. It is for these two reasons that multiscale methods are particularly well-suited to problems in computer vision. Multiscale methods, by way of looking at the coarse scale nature of a
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30

Joerger, Guillaume. "Multiscale modeling and event tracking wireless technologies to improve efficiency and safety of the surgical flow in an OR suite." Thesis, La Rochelle, 2017. http://www.theses.fr/2017LAROS009/document.

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Améliorer la gestion et l’organisation des blocs opératoires est une tâche critique dans les hôpitaux modernes, principalement à cause de la diversité et l’urgence des activités impliquées. Contrairement à l’aviation civile, qui a su optimiser organisation et sécurité, le management de bloc opératoire est plus délicat. Le travail ici présenté abouti au développement et à l’installation de nouvelles technologies assistées par ordinateur résolvant les problèmes quotidiens des blocs opératoires. La plupart des systèmes existants modélisent le flux chirurgical et sont utilisés seulement pour plani
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31

Jiang, Xioben. "Gene Flow and Dispersal of the Caddisfly, Neothremma alicia, in the Rocky Mountains of Utah: A Multiscale Analysis." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2508.

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We determined genetic variance and gene flow across multiple scales (reaches, tributaries, and catchments) to examine the dispersal ability of the caddisfly, Neothremma alicia in streams along the Wasatch Range in the Rocky Mountains of Utah. Neothremma alicia is one of the most abundant caddisflies in this region. We generated DNA sequence data (mitochondrial COI) from 34 reaches, nested in 15 tributaries distributed across 3 adjacent catchments. We identified 47 haplotypes from a total of 486 individuals. The most abundant haplotype (H1) was found at all sites/reaches and comprised 44% of th
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Wang, Xiaojun. "Well-posedness results for a class of complex flow problems in the high Weissenberg number limit." Diss., Virginia Tech, 2012. http://hdl.handle.net/10919/27669.

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For simple fluids, or Newtonian fluids, the study of the Navier-Stokes equations in the high Reynolds number limit brings about two fundamental research subjects, the Euler equations and the Prandtl's system. The consideration of infinite Reynolds number reduces the Navier-Stokes equations to the Euler equations, both of which are dealing with the entire flow region. Prandtl's system consists of the governing equations of the boundary layer, a thin layer formed at the wall boundary where viscosity cannot be neglected. In this dissertation, we investigate the upper convected Maxwell(UCM) mod
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33

Ryan, James L. "Multiscale landscape genetics analysis of feral pigs in the Herbert region of far-north Queensland." Thesis, Queensland University of Technology, 2022. https://eprints.qut.edu.au/227325/1/James_Ryan_Thesis.pdf.

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Management of invasive species is notoriously difficult and often expensive. The aim of this study was to inform feral pig management practises in far-north Queensland by utilising molecular markers and geographic information systems to evaluate the affect of landscape features on feral pig population structure. This thesis evaluated landscape features at multiple spatial scales to identify landscape features that are a barrier or facilitator of feral pig movement and makes recommendations for future management strategies.
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34

Vidotto, Ettore [Verfasser], Barbara [Akademischer Betreuer] Wohlmuth, Paolo [Gutachter] Zunino, Barbara [Gutachter] Wohlmuth, and Kundan [Gutachter] Kumar. "Multiscale methods for flow and transport in porous media / Ettore Vidotto ; Gutachter: Paolo Zunino, Barbara Wohlmuth, Kundan Kumar ; Betreuer: Barbara Wohlmuth." München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1193650410/34.

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35

Hellman, Fredrik. "Numerical Methods for Darcy Flow Problems with Rough and Uncertain Data." Doctoral thesis, Uppsala universitet, Avdelningen för beräkningsvetenskap, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-318589.

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We address two computational challenges for numerical simulations of Darcy flow problems: rough and uncertain data. The rapidly varying and possibly high contrast permeability coefficient for the pressure equation in Darcy flow problems generally leads to irregular solutions, which in turn make standard solution techniques perform poorly. We study methods for numerical homogenization based on localized computations. Regarding the challenge of uncertain data, we consider the problem of forward propagation of uncertainty through a numerical model. More specifically, we consider methods for estim
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36

Peña, Monferrer Carlos. "Computational fluid dynamics multiscale modelling of bubbly flow. A critical study and new developments on volume of fluid, discrete element and two-fluid methods." Doctoral thesis, Universitat Politècnica de València, 2017. http://hdl.handle.net/10251/90493.

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The study and modelling of two-phase flow, even the simplest ones such as the bubbly flow, remains a challenge that requires exploring the physical phenomena from different spatial and temporal resolution levels. CFD (Computational Fluid Dynamics) is a widespread and promising tool for modelling, but nowadays, there is no single approach or method to predict the dynamics of these systems at the different resolution levels providing enough precision of the results. The inherent difficulties of the events occurring in this flow, mainly those related with the interface between phases, makes that
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Mendez, Miguel Alfonso. "Dynamics of Gas Jet Impinging on Falling Liquid Films." Doctoral thesis, Universite Libre de Bruxelles, 2018. https://dipot.ulb.ac.be/dspace/bitstream/2013/281945/5/contratMM.pdf.

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This thesis describes the unstable dynamics of a gas jet impinging on a falling liquid film. This flow configuration is encountered in the jet wiping process, used in continuous coating applications such as the hot-dip galvanizing to control the thickness of a liquid coat on a moving substrate. The interaction between these flows generates a non-uniform coating layer, of great concern for the quality of industrial products, and results from a complex coupling between the interface instabilities of the liquid film and the confinement-driven instabilities of the impinging jet.Combining experimen
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Arcese, Emanuele. "Numerical modeling of microwave plasma actuators for aerodynamic flow control." Thesis, Toulouse, ISAE, 2019. http://www.theses.fr/2019ESAE0020/document.

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Au cours des dernières décennies, les plasmas créés par une décharge micro-ondes ont de plusen plus attiré l’attention de la communauté scientifique aérospatiale sur le sujet du contrôled’écoulements. En effet, il a été démontré expérimentalement que le dépôt d’énergie obtenu parle plasma peut modifier les propriétés aérodynamiques de l’écoulement autour d’un objet telleque la trainée de frottement. Or, la conception et l’optimisation de ces actionneurs plasma entant que technique de contrôle d’écoulements nécessitent une compréhension approfondie de laphysique sous-jacente que les seules expé
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NAQVI, SAHRISH BATOOL. "Application of Homogenization Theory to the Flow Over and Through Micro-Structured, Porous and Elastic Surfaces." Doctoral thesis, Università degli studi di Genova, 2021. http://hdl.handle.net/11567/1057992.

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This research is aimed to develop a homogenized model for practical applications of the fluid flow over and through the microstructured surfaces, which prescribed reliable estimates of the linear response of overall structures. The up-scaling method based on asymptotic theories is used to treat the fluid flow problems where various spatial scales (microscopic and macroscopic) are present. The goal of this work is to provide an in-expensive high-order homogenized framework for the flows over complex textures such as elastic and rigid rough surfaces, isotropic and orthotropic porous media, with
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Yeshala, Nandita. "A coupled lattice Boltzmann-Navier-Stokes methodology for drag reduction." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/37097.

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Helicopter performance is greatly influenced by its drag. Pylons, fuselage, landing gear, and especially the rotor hub of a helicopter experience large separated flow regions, even under steady level flight conditions the vehicle has been designed for, contributing to the helicopter drag. Several passive and active flow control concepts have been studied for reducing helicopter drag. While passive flow control methods reduce drag, they do so at one optimized design condition. Therefore, passive drag reduction methods may not work for helicopters that operate under widely varying flight conditi
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Li, Hao. "Approche multi-échelle pour les écoulements polyphasiques en présence de phénomènes interfaciaux." Electronic Thesis or Diss., Université de Lorraine, 2024. http://www.theses.fr/2024LORR0081.

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Les phénomènes interfaciaux suscitent un intérêt croissant dans divers domaines industriels et fondamentaux tels que les industries pétrolière, alimentaire, cosmétique ou l'imprimerie, etc. Cette thèse se concentre particulièrement sur les phénomènes impliquant des gouttes et des bulles, notamment leur coalescence, étalement, drainage et éclatement dans des fluides non newtoniens. Plusieurs méthodes expérimentales ont été utilisées, incluant un système d'acquisition électrique DC ultra-rapide, une caméra rapide et un micro-PIV à grande vitesse. La première partie de l'étude explore le contact
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42

Bouchnita, Anass. "Mathematical modelling of blood coagulation and thrombus formation under flow in normal and pathological conditions." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSE1300/document.

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Cette thèse est consacrée à la modélisation mathématique de la coagulation sanguine et de la formation de thrombus dans des conditions normales et pathologiques. La coagulation sanguine est un mécanisme défensif qui empêche la perte de sang suite à la rupture des tissus endothéliaux. C'est un processus complexe qui est règlementé par différents mécanismes mécaniques et biochimiques. La formation du caillot sanguin a lieu dans l'écoulement sanguin. Dans ce contexte, l'écoulement à faible taux de cisaillement stimule la croissance du caillot tandis que la circulation sanguine à fort taux de cisa
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Airowaijeh, Jamal S. "Multiscale modeling of flows containing particles." Monterey, Calif. : Naval Postgraduate School, 2007. http://bosun.nps.edu/uhtbin/hyperion-image.exe/07Dec%5FAirowaijeh.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 2007.<br>Thesis Advisor(s): Kwon, Young W. "December 2007." Description based on title screen as viewed on January 17, 2008. Includes bibliographical references (p. 77-78). Also available in print.
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Alrowaijeh, Jamal S. "Multiscale modeling of flows containing particles." Thesis, Monterey California. Naval Postgraduate School, 2007. http://hdl.handle.net/10945/3082.

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Multiscale mathematical modeling of flows containing particles is conducted in this study using computational fluid dynamics and molecular dynamics. The first study considered continuous media interaction of macro-scale fluid and micro-scale solid particles using computational fluid dynamics and rigid particle dynamics. This study investigates the potential enhancement of heat transfer properties of particulate fluid as well as the effect of injected particles on fluid profiles, and pressure on walls under different particle injection conditions. In the second part of this research, the m
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Pinto, Brijesh. "Wavelet-based multiscale simulation of incompressible flows." Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2272/document.

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Cette thèse se concentre sur le développement d'une méthode précise et efficace pour la simulation des grandes échelles (LES) des écoulements turbulents. Une approche de la LES basée sur la méthode variationnelle multi-échelles (VMS) est considérée. La VMS applique aux équations de la dynamique des fluides une séparation d'échelles a priori sans recours à des hypothèses sur les conditions aux limites ou sur l'uniformité du maillage. Afin d'assurer effectivement une séparation d'échelles dans l'espace des nombres d'onde associé, nous choisissons d'utiliser les ondelettes de deuxième génération
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Sun, Jin. "Multiscale modeling of segregation in granular flows." [Ames, Iowa : Iowa State University], 2007.

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Priego, Wood Martin. "Spatiotemporal properties of multiscale two-dimensional flows." Thesis, Imperial College London, 2010. http://hdl.handle.net/10044/1/5761.

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The extraordinary complexity of turbulence has motivated the study of some of its key features in flows with similar structure but simpler or even trivial dynamics. Recently, a novel class of such flows has been developed in the laboratory by applying multiscale electromagnetic forcing to a thin layer of conducting fluid. In spite of being stationary, planar, and laminar these flows have been shown to resemble turbulent ones in terms of energy spectra and particle dispersion. In this thesis, some extensions of these flows are investigated through simulations of a layer-averaged model carried o
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Patronis, Alexander. "Efficient simulation of internal multiscale gas flows." Thesis, University of Warwick, 2015. http://wrap.warwick.ac.uk/74185/.

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We develop, validate, and apply an efficient multiscale method for the simulation of a large class of low-speed internal rarefied gas flows, which are critical to a range of future technologies. The method is based on an existing multiscale approach for the simulation of small-scale dense-fluid flows of high-aspect ratio, but has been extended to support fluid compressibility, non-isothermal conditions, three dimensional domains, and transience. Furthermore, the method is able to treat a broader range of flows: periodic, non-periodic, body-force-driven, pressure-driven, thermally-driven, and s
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ZHENG, WEIBO. "Pore-Scale Simulation of Cathode Catalyst Layers in Proton Exchange Membrane Fuel Cells (PEMFCs)." The Ohio State University, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=osu1555436163992345.

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Aboulhasanzadeh, Bahman. "Multiscale computations of mass transfer in bubbly flows." Thesis, University of Notre Dame, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=3583008.

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<p> Mass transfer and reaction in the liquid phase of gas-liquid multiphase flows usually takes place at a considerably slower rate than the transfer of momentum, so mass flux boundary layers are much thinner than momentum boundary layers. In Direct Numerical Simulations (DNS) the resolution requirement for flows with mass transfer are therefore significantly higher than for flow without mass transfer and reaction. In this work we develop a multi-scale approach and demonstrate its implementation in 2D to compute the mass transfer from buoyant bubbles, using a boundary-layer approximation next
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