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Dissertations / Theses on the topic 'Inertial particle dynamics'

Author: Grafiati
Published: 7 July 2024
Last updated: 31 July 2025

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1

Huck, Peter Dearborn. "Particle dynamics in turbulence : from the role of inhomogeneity and anisotropy to collective effects." Thesis, Lyon, 2017. http://www.theses.fr/2017LYSEN073/document.

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La turbulence est connue pour sa capacité à disperser efficacement de la matière, que ce soit des polluantes dans les océans ou du carburant dans les moteurs à combustion. Deux considérations essentielles s’imposent lorsqu’on considère de telles situations. Primo, l’écoulement sous-jacente pourrait avoir une influence non-négligeable sur le comportement des particules. Secundo, la concentration locale de la matière pourrait empêcher le transport ou l’augmenter. Pour répondre à ces deux problématiques distinctes, deux dispositifs expérimentaux ont été étudiés au cours de cette thèse. Un premier
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2

Lashgari, Iman. "Stability analysis and inertial regimes in complex flows." Doctoral thesis, KTH, Fysiokemisk strömningsmekanik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-177850.

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In this work we rst study the non-Newtonian effects on the inertial instabilities in shear flows and second the inertial suspensions of finite size rigid particles by means of numerical simulations. In the first part, both inelastic (Carreau) and elastic models (Oldroyd-B and FENE-P) have been employed to examine the main features of the non-Newtonian fluids in several congurations; flow past a circular cylinder, in a lid-driven cavity and in a channel. In the framework of the linear stability analysis, modal, non-modal, energy and sensitivity analysis are used to determine the instability mec
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3

Schaaf, Christian [Verfasser], Holger [Akademischer Betreuer] Stark, Holger [Gutachter] Stark, and Roland [Gutachter] Netz. "Particle dynamics in inertial microfluidics / Christian Schaaf ; Gutachter: Holger Stark, Roland Netz ; Betreuer: Holger Stark." Berlin : Technische Universität Berlin, 2020. http://d-nb.info/1219573906/34.

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4

Ramaprabhu, Praveen Kumar. "On the dynamics of Rayleigh-Taylor mixing." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/378.

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The self-similar evolution of a turbulent Rayleigh-Taylor (R-T) mix is investigated through experiments and numerical simulations. The experiments consisted of velocity and density measurements using thermocouples and Particle Image Velocimetry techniques. A novel experimental technique, termed PIV-S, to simultaneously measure both velocity and density fields was developed. These measurements provided data for turbulent correlations, power spectra, and energy balance analyses. The self-similarity of the flow is demonstrated through velocity profiles that collapse when normalized by an appropri
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5

Bagge, Joar. "Numerical simulation of an inertial spheroidal particle in Stokes flow." Thesis, KTH, Numerisk analys, NA, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-180290.

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Particle suspensions occur in many situations in nature and industry. In this master’s thesis, the motion of a single rigid spheroidal particle immersed in Stokes flow is studied numerically using a boundary integral method and a new specialized quadrature method known as quadrature by expansion (QBX). This method allows the spheroid to be massless or inertial, and placed in any kind of underlying Stokesian flow.   A parameter study of the QBX method is presented, together with validation cases for spheroids in linear shear flow and quadratic flow. The QBX method is able to compute the force a
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6

Ferran, Amélie. "Dynamique des particules d'inertie dans une interface turbulente/non turbulente." Electronic Thesis or Diss., Université Grenoble Alpes, 2023. http://www.theses.fr/2023GRALI102.

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Ce projet expérimental étudiera la dynamique des gouttelettes dans une interface turbulente / non turbulente, avec présence de cisaillement. Pour mener à bien cette recherche, nous utiliserons des installations et des techniques de mesure uniques, à savoir deux souffleries équipées de systèmes produisant de la turbulence qui peuvent être activés différentiellement pour générer une interface turbulente / non turbulente. Cette collaboration permettra de couvrir une large gamme de gradients d'intensité turbulente, de taux de cisaillement et de nombres de Reynolds pour l'étude de la dynamique des
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7

Li, Qing. "Near-wall dynamics of neutrally buoyant particles in a wall-normal flow." Thesis, Toulouse, INPT, 2019. http://www.theses.fr/2019INPT0125.

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Les suspensions rencontrées dans diverses applications d’ingénierie (telles que l’extraction de pétrole brut, l’élaboration d’aliments, de béton ou de produits cosmétiques) peuvent présenter une dynamique riche lorsqu’elles sont soumises à un écoulement dans des géométries complexes. Il est important de savoir prédire la réponse de ces matériaux hétérogène sous écoulement compte tenu des applications. Pour construire des modèles prédictifs, il est indispensable de comprendre les phénomènes à différentes échelles, dans diverses configurations telles que l’écoulement d’une dispersion solide-liqu
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8

Vosskuhle, Michel. "Particle collisions in turbulent flows." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2013. http://tel.archives-ouvertes.fr/tel-00946618.

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Cette thèse est consacrée au mécanisme conduisant à des taux de collisions importants dans les suspensions turbulentes de particules inertielles. Le travail a été effectué en suivant numériquement des particules, par simulations directes des équations de Navier-Stokes, et également par étude de modèles simplifiés. Les applications de ce domaine sont nombreuses aussi bien dans un contexte industriel que naturel (astrophysique, géophysique). L'approximation des collisions fantômes (ACF), souvent utilisée pour déterminer les taux de collision numériquement, consiste à compter dans une simulation,
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9

Kilimnik, Alexander. "Cross stream migration of compliant capsules in microfluidic channels." Thesis, Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/43669.

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An understanding of the motion of soft capsules in microchannels is useful for a number applications. This knowledge can be used to develop devices to sort biological cells based on their size and stiffness. For example, cancer cells have a different stiffness from healthy cells and thus can be readily identified. Additionally, devices can be developed to detect flaws in synthetic particles. Using a 3D hybrid lattice Boltzmann and lattice spring method, the motion of rigid and soft capsules in a pressure-driven microfluidic flow was probed. The effect of inertial drift is evaluated in channels
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10

Post, E. Rehmi 1966. "Inertial measurement via dynamics of trapped particles." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29991.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2003.<br>Includes bibliographical references (leaves 69-70).<br>We describe theoretical and practical aspects of the particle trap as an inertial sensor. The insight motivating this approach is that a trapped particle acts like a mass on a spring, but the restoring forces are provided by electrostatic fields. Exquisitely machined physical mechanisms can be replaced by carefully tuned mechanical physics. Such inertial sensors could be simpler to build yet exhibit supe
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11

Skála, Adam. "Analýza inerčního odlučovače částic na vstupu vzduchu do turbovrtulového motoru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-400827.

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This thesis focuses on ingestion of foreign objects into standard turboprop engine GE H80 situated in aircraft Let L-410 Turbolet. Aim of this study is to create methodology of numerical simulation of particle movement inside the engine, which could be used during design process of Inertial Particle Separator device. Thesis consists of backward-facing step benchmark study which validates used methodology. Second part describes flow field calculation and numerical setup. The last part is dedicated to particle tracking analysis. Simulated trajectories are visually investigated, and coordinates o
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12

Mora-Paiba, Daniel. "Clustering and settling dynamics of inertial particles under turbulence." Thesis, Université Grenoble Alpes, 2020. https://thares.univ-grenoble-alpes.fr/2020GRALI044.pdf.

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Les écoulements chargés de particules turbulentes sont répandus dans les applications industrielles et les phénomènes naturels. Au cours des dernières décennies, deux observations: la concentration préférentielle et la modification de la vitesse de sédimentation des particules se sont révélées être les conséquences les plus pertinentes de ces interactions particules - turbulence. Compte tenu de la complexité du problème, ce travail est composé de quatre lots de travaux.Le premier paquet implique une analyse des pièges de la méthode de pavage Vorono "{i}, qui est largement utilisée pour quantif
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13

Rosén, Tomas. "The influence of inertia on the rotational dynamics of spheroidal particles suspended in shear flow." Licentiate thesis, KTH, Mekanik, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-143663.

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Dispersed particle flows occur in many industrial, biological and geophysical applications. The knowledge of how these flow behave can for example lead to improved material processes, better predictions of vascular diseases or more accurate climate models. These particle flows have certain properties that depend on single particle motion in fluid flows and especially how they are distributed both in terms of spatial position and, if they are non-spherical, in terms of orientation. Much is already known about the motion of perfectly spherical particles. For non-spherical particles, apart from t
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14

Sumbekova, Sholpan. "Clustering of inertial sub-Kolmogorov particles : structure of clusters and their dynamics." Thesis, Université Grenoble Alpes (ComUE), 2016. http://www.theses.fr/2016GREAI093/document.

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Cette thèse étudie les phénomènes de concentration préférentielle et de sédimentation de particules inertielles transportées dans un écoulement turbulent. Pour cela, des expériences ont été menées en soufflerie dans une turbulence engendrée en aval d’une grille active et ensemencée avec des gouttelettes d'eau. La concentration préférentielle se manifeste par la ségrégation spatiale des particules qui bien qu’initialement ensemencée de façon homogène, tendent à se regrouper en amas, laissant en déplétion d’autres zones de l’écoulement. Un effort particulier a été consacré à séparer les mécanism
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15

Seltz, Andréa. "Application of deep learning to turbulent combustion modeling of real jet fuel for the numerical prediction of particulate emissions Direct mapping from LES resolved scales to filtered-flame generated manifolds using convolutional neural networks Solving the population balance equation for non-inertial particles dynamics using probability density function and neural networks: application to a sooting flame." Thesis, Normandie, 2020. http://www.theses.fr/2020NORMIR08.

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Face à l'urgence climatique, l’efficacité énergétique et la réduction des émissions polluantes est devenue une priorité pour l'industrie aéronautique. La précision de la modélisation des phénomènes physicochimiques joue un rôle critique dans qualité de la prédiction des émissions de suie et des gaz à effet de serre par les chambres de combustion. Dans ce contexte, des méthodes d’apprentissage profond sont utilisées pour construire des modélisations avancées des émissions de particules. Une méthode automatisée de réduction et d’optimisation de la cinétique chimique d’un combustible aéronautique
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16

Djeddou, Mokhtar. "Étude de la dynamique des polluants particulaires dans un habitacle automobile." Electronic Thesis or Diss., Université de Lorraine, 2023. http://www.theses.fr/2023LORR0231.

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La pollution de l'air, en particulier celle due aux particules fines et ultrafines, a des effets délétères considérables sur la santé humaine. Plusieurs études ont établi un lien direct entre l'exposition à la pollution particulaire et diverses maladies respiratoires et cardiovasculaires. À l'intérieur des véhicules, la menace est d'autant plus préoccupante en raison de concentrations importantes de polluants particulaires recensées. Par conséquent, l'amélioration de la qualité de l'air dans l'habitacle des véhicules est désormais une priorité majeure pour les constructeurs automobiles. Dans c
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17

Rosén, Tomas. "Angular dynamics of non-spherical particles in linear flows related to production of biobased materials." Doctoral thesis, KTH, Linné Flow Center, FLOW, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-193124.

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Dispersed particle flows are encountered in many biological, geophysical but also in industrial situations, e.g. during processing of materials. In these flows, the particles usually are non-spherical and their angular dynamics play a crucial role for the final material properties. Generally, the angular dynamics of a particle is dependent on the local flow in the frame-of-reference of this particle. In this frame, the surrounding flow can be linearized and the linear velocity gradient will determine how the particle rotates. In this thesis, the main objective is to improve the fundamental kno
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18

Tallapragada, Phanindra. "Identifying dynamical boundaries and phase space transport using Lagrangian coherent structures." Diss., Virginia Tech, 2010. http://hdl.handle.net/10919/28891.

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In many problems in dynamical systems one is interested in the identification of sets which have qualitatively different fates. The finite-time Lyapunov exponent (FTLE) method is a general and equation-free method that identifies codimension-one sets which have a locally high rate of stretching around which maximal exponential expansion of line elements occurs. These codimension-one sets thus act as transport barriers. This geometric framework of transport barriers is used to study various problems in phase space transport, specifically problems of separation in flows that can vary in scale fr
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19

Bordes, Guilhem. "Interactions non-linéaires d'ondes et tourbillons en milieu stratifié ou tournant." Phd thesis, Ecole normale supérieure de lyon - ENS LYON, 2012. http://tel.archives-ouvertes.fr/tel-00733175.

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Les ondes gravito-inertielles jouent un rôle majeur dans les échanges d'énergie globaux sur la planète. Si la génération des ondes est bien connue dans l'atmosphère et l'océan, le devenir de ces ondes au cours de leur propagation n'est pas complètement défini aujourd'hui. Ces ondes peuvent interagir de façon non-linéaire avec elles-mêmes et créer des structures de plus petite échelle qui vont se dissiper plus facilement. Ainsi, le phénomène d'instabilité paramétrique sous-harmonique (PSI), a été étudié de façon expérimentale. Nous avons effectué la première mise en évidence expérimentale de l'
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20

Lovalenti, Philip Michael. "Inertial effects on particle dynamics." Thesis, 1993. https://thesis.library.caltech.edu/3286/1/Lovalenti_pm_1993.pdf.

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While the theory of suspension flows and particle dynamics is well understood under Stokes flow conditions when viscous forces dominate, little is known at finite Reynolds number when the inertial forces of the suspending fluid are important. In the present study, expressions are derived that allow for dynamic calculations of particle, drop, and bubble motion at finite Reynolds number. The results show a significant change in the temporal behavior of the force/velocity relationship from that derived from the unsteady Stokes equations, particularly as a body approaches its steady state. At fini
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21

Parisi, Giovanni [Verfasser]. "Investigations on particle dynamics in a high intensity heavy ion linac for inertial fusion / Giovanni Parisi." 2005. http://d-nb.info/97696581X/34.

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22

Abbas-Pour, Nima. "A Numerical Model for Oil/water Separation from an Accelerating Oil-coated Solid Particle." Thesis, 2013. http://hdl.handle.net/1807/42657.

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A computational fluid dynamics model has been developed to examine the separation of an oil film from a spherical oil-coated particle falling through quiescent water due to gravity. Using this model, the separation process was studied as a function of the viscosity ratio of oil to water, R, and the ratio of viscous forces to surface tension, represented by the Capillary number Ca. The governing equations of this flow-induced motion are derived in a non-inertial spherical coordinate system, and discretized using a finite volume approach. The Volume-of-Fluid method is used to capture the oil/wat
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23

Zahnow, Jens C. [Verfasser]. "Aggregation and fragmentation dynamics of inertial particles in fluid flows / von Jens C. Zahnow." 2010. http://d-nb.info/1010475126/34.

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24

Oratis, Alexandros. "Beams and bubbles: interplay between elastic, inertial, viscous, and interfacial mechanics." Thesis, 2021. https://hdl.handle.net/2144/42596.

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Beams are ubiquitous in our everyday life and can be found in a variety of length scales, from large supports of buildings to carbon nanotubes. Similarly, bubbles can also span a variety of scales, ranging from tiny bubbles in a glass filled with champagne to the giant soap bubbles formed by artists to attract crowds. Yet, the behavior of beams and bubbles can often occur so fast that the dynamics go unnoticed. This dissertation aims to understand the mechanics of beams and bubbles in four different examples. We combine table-top experiments with mathematical models to predict how each system
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25

Gupta, Anupam. "Numerical Studies of Problems in Turbulence : 1) Fluid Films with Polymer Additives; 2) Fluid Films with Inertial and Elliptical Particles; 3) Scaled Vorticity Moments in Three- and Two-dimensional Turbulence." Thesis, 2013. http://etd.iisc.ac.in/handle/2005/2843.

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In this thesis we study a variety of problems in fluid turbulence, principally in two dimensions. A summary of the main results of our studies is given below; we indicate the Chapters in which we present these. In Chapter 1, we provide an overview of several problems in turbulence with special emphasis on background material for the problems we study in this thesis. In particular, we give (a) natural and laboratory examples of fluid turbulence, (b) and introductory accounts of the equations of hydrodynamics, without and with polymer additives, Eulerian and Lagrangian frameworks, and the equati
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26

Gupta, Anupam. "Numerical Studies of Problems in Turbulence : 1) Fluid Films with Polymer Additives; 2) Fluid Films with Inertial and Elliptical Particles; 3) Scaled Vorticity Moments in Three- and Two-dimensional Turbulence." Thesis, 2013. http://hdl.handle.net/2005/2843.

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In this thesis we study a variety of problems in fluid turbulence, principally in two dimensions. A summary of the main results of our studies is given below; we indicate the Chapters in which we present these. In Chapter 1, we provide an overview of several problems in turbulence with special emphasis on background material for the problems we study in this thesis. In particular, we give (a) natural and laboratory examples of fluid turbulence, (b) and introductory accounts of the equations of hydrodynamics, without and with polymer additives, Eulerian and Lagrangian frameworks, and the equati
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27

Rahaman, Md Masiur. "Dynamic Flow Rules in Continuum Visco-plasticity and Damage Models for Poly-crystalline Solids." Thesis, 2017. http://etd.iisc.ac.in/handle/2005/4240.

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Modelling highly non-linear, strongly temperature- and rate-dependent visco-plastic behaviour of poly-crystalline solids (e.g., metals and metallic alloys) is one of the most challenging topics of contemporary research interest, mainly owing to the increasing use of metallic structures in engineering applications. Numerous classical models have been developed to model the visco-plastic behaviour of poly-crystalline solids. However, limitations of classical visco-plasticity models have been realized mainly in two cases: in problems at the scale of mesoscopic length (typically in the range of a
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