Bibliographies thématiques / Active Brownian Particles

Littérature scientifique sur le sujet « Active Brownian Particles »

Auteur : Grafiati
Publié le 11 mars 2023

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Articles de revues sur le sujet "Active Brownian Particles"

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Romanczuk, P., M. Bär, W. Ebeling, B. Lindner et L. Schimansky-Geier. « Active Brownian particles ». European Physical Journal Special Topics 202, no 1 (mars 2012) : 1–162. http://dx.doi.org/10.1140/epjst/e2012-01529-y.

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Arkar, Kyaw, Mikhail M. Vasiliev, Oleg F. Petrov, Evgenii A. Kononov et Fedor M. Trukhachev. « Dynamics of Active Brownian Particles in Plasma ». Molecules 26, no 3 (21 janvier 2021) : 561. http://dx.doi.org/10.3390/molecules26030561.

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Experimental data on the active Brownian motion of single particles in the RF (radio-frequency) discharge plasma under the influence of thermophoretic force, induced by laser radiation, depending on the material and type of surface of the particle, are presented. Unlike passive Brownian particles, active Brownian particles, also known as micro-swimmers, move directionally. It was shown that different dust particles in gas discharge plasma can convert the energy of a surrounding medium (laser radiation) into the kinetic energy of motion. The movement of the active particle is a superposition of chaotic motion and self-propulsion.
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Svetlov, Anton S., Mikhail M. Vasiliev, Evgeniy A. Kononov, Oleg F. Petrov et Fedor M. Trukhachev. « 3D Active Brownian Motion of Single Dust Particles Induced by a Laser in a DC Glow Discharge ». Molecules 28, no 4 (14 février 2023) : 1790. http://dx.doi.org/10.3390/molecules28041790.

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The active Brownian motion of single dust particles of various types in the 3D electrostatic DC discharge trap under the action of laser radiation is studied experimentally. Spherical dust particles with a homogeneous surface, as well as Janus particles, are used in the experiment. The properties of the active Brownian motion of all types of dust particles are studied. In particular, the 3D analysis of trajectories of microparticles is carried out, well as an analysis of their root mean square displacement. The mean kinetic energy of motion of the dust particle of various types in a 3D trap is determined for different laser powers. Differences in the character of active Brownian motion in electrostatic traps with different spatial dimensions are found.
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Cugliandolo, Leticia F., Giuseppe Gonnella et Isabella Petrelli. « Effective Temperature in Active Brownian Particles ». Fluctuation and Noise Letters 18, no 02 (29 mai 2019) : 1940008. http://dx.doi.org/10.1142/s021947751940008x.

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In this paper, we perform a numerical analysis of the effective temperature extracted from the deviations from the fluctuation dissipation theorem in a system of active Brownian spherical particles with excluded volume interactions. We show that, in the low density homogeneous phase at fixed Péclet number, the effective temperature decreases when the density of the system is increased. We compare this trend to the one found in the literature with simulations of other active models.
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Schimansky-Geier, Lutz, Michaela Mieth, Helge Rosé et Horst Malchow. « Structure formation by active Brownian particles ». Physics Letters A 207, no 3-4 (octobre 1995) : 140–46. http://dx.doi.org/10.1016/0375-9601(95)00700-d.

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Сергеев, К. С., et K. S. Sergeev. « Dynamics of Ensemble of Active Brownian Particles Controlled by Noise ». Mathematical Biology and Bioinformatics 10, no 1 (16 février 2015) : 72–87. http://dx.doi.org/10.17537/2015.10.72.

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Dynamics of an ensemble of small number of active Brownian particles is studied by means of numerical simulations. The particles are influenced by independent sources of noise, passive and active, and interact with each other through a global velocity field. We suppose that active noise affects to direction of the particle velocity only. Behaviour of the large ensemble and behaviour of the small one are compared. Mean velocity of particles of the large ensemble was analytically estimated earler. We show that a noise-induced "order- disorder" transition accompaniated by a bistability phenomena is observed in a small ensemble. A borderline of a coupling coefficient moves up while reducing the number of particles. Influence of passive noise leads to conversion of bistability to bimodality. There are two most probable values of a particle velocity in the last case. Borders of regions of bistability and bimodality are defined by the stochastic bifurcations of different kinds.
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Dulaney, Austin R., et John F. Brady. « Machine learning for phase behavior in active matter systems ». Soft Matter 17, no 28 (2021) : 6808–16. http://dx.doi.org/10.1039/d1sm00266j.

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We demonstrate that deep learning techniques can be used to predict motility-induced phase separation (MIPS) in suspensions of active Brownian particles (ABPs) by creating a notion of phase at the particle level.
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Großmann, R., L. Schimansky-Geier et P. Romanczuk. « Active Brownian particles with velocity-alignment and active fluctuations ». New Journal of Physics 14, no 7 (13 juillet 2012) : 073033. http://dx.doi.org/10.1088/1367-2630/14/7/073033.

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Caprini, Lorenzo, Claudio Maggi et Umberto Marini Bettolo Marconi. « Collective effects in confined active Brownian particles ». Journal of Chemical Physics 154, no 24 (28 juin 2021) : 244901. http://dx.doi.org/10.1063/5.0051315.

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Wang, Liya, Xinpeng Xu, Zhigang Li et Tiezheng Qian. « Active Brownian particles simulated in molecular dynamics ». Chinese Physics B 29, no 9 (septembre 2020) : 090501. http://dx.doi.org/10.1088/1674-1056/aba60d.

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Thèses sur le sujet "Active Brownian Particles"

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Bechinger, Clemens. « Active Brownian motion of asymmetric particles ». Universitätsbibliothek Leipzig, 2015. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-179545.

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Bechinger, Clemens. « Active Brownian motion of asymmetric particles ». Diffusion fundamentals 20 (2013) 16, S. 1, 2013. https://ul.qucosa.de/id/qucosa%3A13540.

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Siebert, Jonathan Tammo [Verfasser]. « Computer simulations of active Brownian particles / Jonathan Tammo Siebert ». Mainz : Universitätsbibliothek Mainz, 2018. http://d-nb.info/1173827951/34.

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Wittkowski, Raphael [Verfasser]. « Brownian dynamics of active and passive anisotropic colloidal particles / Raphael Wittkowski ». Aachen : Shaker, 2012. http://d-nb.info/1066197733/34.

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Bäuerle, Tobias Doyle [Verfasser]. « Collective phenomena in active Brownian particles with feedback controlled interaction rules / Tobias Doyle Bäuerle ». Konstanz : KOPS Universität Konstanz, 2020. http://d-nb.info/1221524798/34.

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Krinninger, Philip [Verfasser], et Matthias [Akademischer Betreuer] Schmidt. « Effective Equilibrium, Power Functional, and Interface Structure for Phase-Separating Active Brownian Particles / Philip Krinninger ; Betreuer : Matthias Schmidt ». Bayreuth : Universität Bayreuth, 2019. http://d-nb.info/1177143070/34.

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Wittkowski, Raphael [Verfasser], Hartmut [Akademischer Betreuer] Löwen, Helmut [Akademischer Betreuer] Brand et Holger [Akademischer Betreuer] Stark. « Brownian dynamics of active and passive anisotropic colloidal particles / Raphael Wittkowski. Gutachter : Helmut Brand ; Holger Stark. Betreuer : Hartmut Löwen ». Düsseldorf : Universitäts- und Landesbibliothek der Heinrich-Heine-Universität Düsseldorf, 2012. http://d-nb.info/1024161064/34.

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Nötel, Jörg. « Active Brownian Particles with alpha Stable Noise in the Angular Dynamics : Non Gaussian Displacements, Adiabatic Eliminations, and Local Searchers ». Doctoral thesis, Humboldt-Universität zu Berlin, 2019. http://dx.doi.org/10.18452/19681.

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Das Konzept von aktiven Brownschen Teilchen kann benutzt werden, um das Verhalten einfacher biologischer Organismen oder künstlicher Objekte, welche die Möglichkeit besitzen sich von selbst fortzubewegen zu beschreiben. Als Bewegungsgleichungen für aktive Brownsche Teilchen kommen Langevin Gleichungen zum Einsatz. In dieser Arbeit werden aktive Teilchen mit konstanter Geschwindigkeit diskutiert. Im ersten Teil der Arbeit wirkt auf die Bewegungsrichtung des Teilchen weißes alpha-stabiles Rauschen. Es werden die mittlere quadratische Verschiebung und der effektive Diffusionskoeffizient bestimmt. Eine überdampfte Beschreibung, gültig für Zeiten groß gegenüber der Relaxationszeit wird hergleitet. Als experimentell zugängliche Meßgröße, welche als Unterscheidungsmerkmal für die unterschiedlichen Rauscharten herangezogen werden kann, wird die Kurtose berechnet. Neben weißem Rauschen wird noch der Fall eines Ornstein-Uhlenbeck Prozesses angetrieben von Cauchy verteiltem Rauschen diskutiert. Während eine normale Diffusion mit zu weißem Rauschen identischem Diffusionskoeffizienten bestimmt wird, kann die beobachtete Verteilung der Verschiebungen Nicht-Gaußförmig sein. Die Zeit für den Übergang zur Gaußverteilung kann deutlich größer als die Zeitskale Relaxationszeit und die Zeitskale des Ornstein-Uhlenbeck Prozesses sein. Eine Grenze der benötigten Zeit wird durch eine Näherung der Kurtosis ermittelt. Weiterhin werden die Grundlagen eines stochastischen Modells für lokale Suche gelegt. Lokale Suche ist die Suche in der näheren Umgebung eines bestimmten Punktes, welcher Haus genannt wird. Abermals diskutieren wir ein aktives Teilchen mit unveränderlichem Absolutbetrag der Geschwindigkeit und weißen alpha-stabilem Rauschen in der Bewegungsrichtungsdynamik. Die deterministische Bewegung des Teilchens wird analysiert bevor die Situation mit Rauschen betrachtet wird. Die stationäre Aufenthaltswahrscheinlichkeitsdichtefunktion wird bestimmt. Es wird eine optimale Rauschstärke für die lokale Suche, das heißt für das Auffinden eines neuen Ortes in kleinstmöglicher Zeit festgestellt. Die kleinstmögliche Zeit wird kaum von der Rauschart abhängen. Wir werden jedoch feststellen, dass die Rauschart deutlichen Einfluß auf die Rückkehrwahrscheinlichkeit zum Haus hat, wenn die Richtung des zu Hauses fehlerbehaftet ist. Weiterhin wird das Model durch eine an das Haus abstandsabhängige Kopplung erweitert werden. Zum Abschluß betrachten wir eine Gruppe von Suchern.
Active Brownian particles described by Langevin equations are used to model the behavior of simple biological organisms or artificial objects that are able to perform self propulsion. In this thesis we discuss active particles with constant speed. In the first part, we consider angular driving by white Levy-stable noise and we discuss the mean squared displacement and diffusion coefficients. We derive an overdamped description for those particles that is valid at time scales larger the relaxation time. In order to provide an experimentally accessible property that distinguishes between the considered noise types, we derive an analytical expression for the kurtosis. Afterwards, we consider an Ornstein-Uhlenbeck process driven by Cauchy noise in the angular dynamics of the particle. While, we find normal diffusion with the diffusion coefficient identical to the white noise case we observe a Non-Gaussian displacement at time scales that can be considerable larger than the relaxation time and the time scale provided by the Ornstein-Uhlenbeck process. In order to provide a limit for the time needed for the transition to a Gaussian displacement, we approximate the kurtosis. Afterwards, we lay the foundation for a stochastic model for local search. Local search is concerned with the neighborhood of a given spot called home. We consider an active particle with constant speed and alpha-stable noise in the dynamics of the direction of motion. The deterministic motion will be discussed before considering the noise to be present. An analytical result for the steady state spatial density will be given. We will find an optimal noise strength for the local search and only a weak dependence on the considered noise types. Several extensions to the introduced model will then be considered. One extension includes a distance dependent coupling towards the home and thus the model becomes more general. Another extension concerned with an erroneous understanding by the particle of the direction of the home leads to the result that the return probability to the home depends on the noise type. Finally we consider a group of searchers.
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Locatelli, Emanuele. « Dynamical and collective properties of active and passive particles in Single File ». Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3423763.

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Particles motion inside complex, irregular or crowded environments is a common phenomenon ranging from microscopic to macroscopic scales. It can be involved in everyday practical problems, like traffic, in fundamental biological mechanisms, like growth and reproduction of cells, and in important industrial or chemical applications, like oil catalysis. In many cases, transport in crowded environments is guided by 'active' elements, i.e. units that consume energy in order to produce motion. Among systems belonging in this class, the diffusion of hard-core particles in a channel so narrow they cannot pass each other, known as Single File Diffusion, has assumed a particular role. Single File Diffusion is responsible for the transport of ions in membrane channels, the diffusion in nano- and micro-porous materials and has been observed in many other natural and artificial systems. Aim of this thesis is to investigate Single File system of passive (purely diffusive) or active (self propelled) particles, focusing on the effects of the activity on the Single File motion and on the Single File properties in the presence of absorbing boundaries. Most of the work has been carried out developing analytical and numerical tools within the framework of the Stochastic Processes. By using single particle techniques in a microfluidic approach, we obtained an excellent comparison between experimental data and numerical model of particles emptying a Single File channel with open ends. In this thesis, after a brief introduction in the framework of confined diffusion processes, we will review the most relevant works in the theoretical and experimental literature of Single File Diffusion, with particular attention to an analytical technique, the Reflection Principle Method, which will be extensively used in this thesis. We will investigate the properties of Single File systems of diffusing particles in presence of two absorbing boundaries, with particular interest to the survival probability, i.e. the probability to find a particle between the boundaries at time t. We will provide an analytical solution of the emptying process, i.e. we calculate the probability characterizing the progressive decrease of the number of particles in the presence of absorbing boundaries, and for the survival probability of a Tagged Particle within the file, either in the presence or in the absence of a constant external force. We also characterize the trend of the characteristic survival times (also called Mean First Passage Times) as function of the system size and of the initial number of particles. We also investigate numerically the case when only the central particle is affected by the absorbing boundaries. We find an exponential decay of the survival probability, as it happens for normal diffusive processes, even in the presence of overcrowding. We will then introduce activity in a Single File system, through a Self-Propelled Particle model, for which we will provide a detailed characterization. In particular, within this model, particles can be either runners or tumblers, if their motion is dominated by straight runs or by changes of direction, respectively. Under Single File conditions, runners tend to form dynamical aggregates: these clusters are continuously formed and disassembled due to random fluctuations of the activity. For tumblers, the survival probabilities are still well described by the analytical theory developed for passive diffusing particles. Conversely, the formation of dynamical clusters enhances anomalous behaviours in the characteristic survival times of runners and induces a remarkable capacity to overcome the action of an external force.
Il moto di particelle in mezzi irregolari, complessi o affollati è un fenomeno comune, dalla scala microscopica a quella macroscopica. Lo si può incontrare tanto in situazioni comuni, come il traffico, quanto in meccanismi biologici, come la riproduzione e la crescita delle cellule, e in importanti processi chimici e tecnologici, come la catalisi di idrocarburi. In molti casi, il trasporto in mezzi confinati o affollati è guidato da elementi 'attivi', cioè unità che consumano energia per sostenere il loro stato di moto. Fra i diversi sistemi soggetti a confinamento, particolare rilevanza è rivestita dalla diffusione di sfere impenetrabili in un canale così stretto da non permettere il passaggio di più di una particella alla volta, conosciuto come diffusione in Single File. La diffusione in Single File è il meccanismo responsabile del trasporto di ioni attraverso la membrana cellulare, della diffusione in materiali micro e nanoporosi ed è stata osservata in molti altri sistemi naturali ed artificiali. Scopo di questa tesi è lo studio su scala mesoscopica di particelle passive (diffusive) o attive (auto-propellenti) in condizioni di Single File, con particolare attenzione all'effetto dell'attività sulla dinamica e sulle proprietà delle particelle nel caso siano presenti condizioni al contorno assorbenti. Gran parte del lavoro è stato svolto nello sviluppo di risultati analitici e numerici nel contesto dei Processi Stocastici. Inoltre, mediante tecniche di manipolazione ottica di singola particella in canali microfluidici, abbiamo ottenuto una eccellente confronto fra dati sperimentali e numerici per il processo di svuotamento di un sistema di particelle in condizioni di Single File. In questa tesi, dopo una breve introduzione ai processi diffusivi fortemente confinati, passeremo in rassegna i lavori più rilevanti della letteratura teorica e sperimentale sulla Single File Diffusion, con particolare attenzione ad un formalismo matematico, il Reflection Principle Method, che sarà applicato in maniera estensiva nel corso della tesi. Studieremo poi le proprietà di un sistema di particelle diffusive in Single File in presenza di condizioni al contorno assorbenti, concentrandoci sulla survival probability, cioè la probabilità di trovare una particella fra gli estremi del sistema al tempo t. Mostreremo come, in condizioni di Single File, abbiamo ottenuto una soluzione analitica per il processo di svuotamento, cioè calcoleremo la probabilità che caratterizza la progressiva diminuzione del numero di particelle in presenza di condizioni al contorno assorbenti, e per la survival probability di una particella 'marcata' all'interno della Single File sia in presenza che in assenza di una forza esterna costante. Caratterizzeremo gli andamenti dei tempi caratteristici di sopravvivenza, chiamati Tempi Medi di Primo Passaggio, in funzione della taglia del canale e del numero iniziale di particelle. Indagheremo inoltre numericamente il caso in cui solo la particella centrale del sistema in Single File subisce l'effetto delle condizioni al contorno assorbenti. Osserviamo un decadimento esponenziale della survival probability, come accade nell'usuale moto Browniano, anche in presenza di estremo confinamento. Introdurremo l'attività nella Single File attraverso un modello di particelle Self-Propelled, di cui descriveremo le proprietà in dettaglio. In particolare in questo modello le particelle possono essere o runners o tumblers, a seconda che la loro traiettoria sia dominata da lunghi tratti rettilinei o da cambi di direzione. In condizioni di Single File, i runners tendono a formare aggregati dinamici: questi cluster vengono continuamente formati e distrutti dalle fluttuazioni casuali della forza propulsiva. Per i tumblers, le probabilità di sopravvivenza sono ben descritte dalla teoria analitica sviluppata per le particelle passive. Per contro, la formazione di cluster dinamici accresce i comportamenti anomali nei tempi caratteristici di sopravvivenza dei runners e ne induce una notevole capacità di opporsi all'azione di un campo esterno.
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Nötel, Jörg [Verfasser], L. [Gutachter] Schimansky-Geier, H. [Gutachter] Engel et E. E. N. [Gutachter] Macau. « Active Brownian Particles with alpha Stable Noise in the Angular Dynamics : Non Gaussian Displacements, Adiabatic Eliminations, and Local Searchers / Jörg Nötel ; Gutachter : L. Schimansky-Geier, H. Engel, E. E. N. Macau ». Berlin : Humboldt-Universitaet zu Berlin, 2019. http://d-nb.info/1175995150/34.

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Livres sur le sujet "Active Brownian Particles"

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Brownian Agents and Active Particles : Collective dynamics in the natural and social sciences. Berlin : Springer, 2003.

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Browning [sic] agents and active particles : Collective dynamics in the natural and social sciences. 2e éd. Berlin : Springer, 2007.

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Browning [sic] agents and active particles : Collective dynamics in the natural and social sciences. 2e éd. Berlin : Springer, 2007.

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Farmer, J. D., et Frank Schweitzer. Brownian Agents and Active Particles : Collective Dynamics in the Natural and Social Sciences. Springer London, Limited, 2007.

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Schweitzer, Frank. Brownian Agents and Active Particles : Collective Dynamics in the Natural and Social Sciences (Springer Series in Synergetics). Springer, 2007.

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Browning Agents and Active Particles. Berlin, Heidelberg : Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-73845-9.

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Chapitres de livres sur le sujet "Active Brownian Particles"

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Callegari, Agnese, et Giovanni Volpe. « Numerical Simulations of Active Brownian Particles ». Dans Soft and Biological Matter, 211–38. Cham : Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-23370-9_7.

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Ebeling, Werner. « Nonlinear Dynamics of Active Brownian Particles ». Dans Computational Statistical Physics, 141–51. Berlin, Heidelberg : Springer Berlin Heidelberg, 2002. http://dx.doi.org/10.1007/978-3-662-04804-7_9.

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Schweitzer, F. « Active Brownian Particles with Internal Energy Depot ». Dans Traffic and Granular Flow ’99, 161–72. Berlin, Heidelberg : Springer Berlin Heidelberg, 2000. http://dx.doi.org/10.1007/978-3-642-59751-0_15.

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Lozano, Celia, Tobias Bäuerle et Clemens Bechinger. « Active Brownian Particles with Programmable Interaction Rules ». Dans Active Matter and Nonequilibrium Statistical Physics, 219–29. Oxford University PressOxford, 2022. http://dx.doi.org/10.1093/oso/9780192858313.003.0007.

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Abstract It is commonly assumed that collective dynamics in living system emerges when individuals adapt their behavior to their peers. Usually, individuals respond to perceived stimuli by moving according to certain behavioral rules , e.g. attraction and or alignment with and to neighbours. Assessing the consequences of such individual perception-response rules at the group level is of paramount importance to understand, predict, and reproduce a given collective behavior. Here, we demonstrate that quorum sensing being employed by bacterial organisms can be implemented in a system of active colloidal particles whose response is controlled on a single particle level using an optical feedback mechanism. With this approach we are able to demonstrate that quorum sensing strongly enhances the formation of clusters, which are – compared to motility induced phase separation of uncontrolled particles – observed at considerably smaller densities.
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« Active Brownian particles and Nosé-Hoover dynamics ». Dans Advanced Series in Nonlinear Dynamics, 303–15. WORLD SCIENTIFIC, 2007. http://dx.doi.org/10.1142/9789812771513_0016.

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SCHWEITZER, FRANK. « Modelling Migration and Economic Agglomeration with Active Brownian Particles ». Dans Modeling Complexity in Economic and Social Systems, 137–59. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812777263_0010.

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Actes de conférences sur le sujet "Active Brownian Particles"

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Velu, Sabareesh K. P., Erçağ Pinçe, Agnese Callegari, Parviz Elahi, Sylvain Gigan, Giovanni Volpe et Giorgio Volpe. « Controlling Active Brownian Particles in Complex Settings ». Dans Optical Trapping Applications. Washington, D.C. : OSA, 2017. http://dx.doi.org/10.1364/ota.2017.otm2e.2.

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Volpe, Giorgio, Sylvain Gigan et Giovanni Volpe. « Simulation of active Brownian particles in optical potentials ». Dans SPIE NanoScience + Engineering, sous la direction de Kishan Dholakia et Gabriel C. Spalding. SPIE, 2014. http://dx.doi.org/10.1117/12.2061049.

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Yadav, Sunil Kumar, et Shankar P. Das. « Field-theoretic model for dynamics of active Brownian particles ». Dans DAE SOLID STATE PHYSICS SYMPOSIUM 2018. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5112870.

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Argun, Aykut, et Giovanni Volpe. « Statistics of Brownian particles held in non-harmonic potentials in an active bath ». Dans Optical Manipulation and Its Applications. Washington, D.C. : OSA, 2019. http://dx.doi.org/10.1364/oma.2019.at1e.3.

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Ito, Kana, et Akira Satoh. « On the Hybrid-Type Method of Brownian Dynamics and Lattice Boltzmann for Activating the Brownian Motion of Magnetic Particles ». Dans ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-87165.

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We have discussed the feasibility of a method for activating the Brownian motion of dispersed particles in the lattice Boltzmann method. The method to be treated in the present study is a technique based on the Brownian dynamics method, in which the random forces in the Brownian dynamics are added to the equations of motion of magnetic particles. In order to activate the Brownian motion at a physically reasonable level, a viscosity-modifying method is introduced in adjusting the random displacements of the particles. The viscosity-modifying method is verified by comparing the present results with those of the Monte Carlo simulations. The main results obtained here are summarized as follows. The aggregate structures of magnetic particles are in good agreement with the results of the Monte Carlo method. Moreover, the pair correlation functions agree well with the Monte Carlo results quantitatively. The scaling coefficient of viscosity is seen to be constant and independent of the strengths of magnetic particle-field and particle-particle interactions. Also, it is independent of the volumetric fraction and the number of particles, if lattice system’s roughness is constant. We may conclude from these results that the hybrid-type method of lattice Boltzmann and Brownian dynamics combined with the viscosity-modifying procedure can be expected to be a hopeful technique for simulating a flow problem of magnetic particles under a non-uniform applied magnetic field.
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Ou-Yang, H. Daniel, et Chong Shen. « Fluctuation-dissipation of an active Brownian particle under confinement ». Dans Optical Trapping and Optical Micromanipulation XV, sous la direction de Kishan Dholakia et Gabriel C. Spalding. SPIE, 2018. http://dx.doi.org/10.1117/12.2325011.

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Shen, Chong, Zhiyu Jiang, Lanfang Li et H. Daniel Ou-Yang. « Extract active fluctuations from total fluctuations of a confined active Brownian particle ». Dans Optical Trapping and Optical Micromanipulation XVII, sous la direction de Kishan Dholakia et Gabriel C. Spalding. SPIE, 2020. http://dx.doi.org/10.1117/12.2570663.

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Yokoyama, Haruka, et Akira Satoh. « On the Behavior of an Oblate Spheroidal Hematite Particle in a Simple Shear Flow Under a Uniform Magnetic Field Applied in the Flow Direction ». Dans ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-64226.

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We discuss the orientational properties of an oblate spheroidal hematite particle and also its influence on the rheological characteristics of a dilute suspension of these magnetic particles, by means of an analytical approach based on the orientational distribution function. An oblate spheroidal hematite particle has an important characteristic that it is magnetized in a direction normal to the particle axis. This particle is assumed to conduct the rotational Brownian motion including both the usual and spin Brownian motion in a simple shear flow under a uniform magnetic field applied in the shear flow direction. In the present analysis, we have taken into account only the friction force (torque) with neglecting the hydrodynamic interactions among particles. From the balance of the torques acting on a particle, we have developed the basic equation of the orientational distribution function. This basic equation has been numerically solved in order to investigate the dependence of the orientational distribution on the magnetic field strength, shear rate and rotational Brownian motion, and also the relationship between the orientational distribution and the transport coefficients such as viscosity and diffusion coefficient. The results obtained here are summarized as follows. If both the magnetic field and the shear flow are weak, the particle does not exhibit specific directional characteristics under the influence of rotational Brownian motion. If the magnetic field is more dominant, the particle inclines such that the oblate surface is parallel to the magnetic field direction. If the Peclet number increases and the shear flow becomes more dominant, the particle shows a sharper peak of the orientational distribution in the shear flow direction. The viscosity due to the magnetic torque increases and finally converges to a constant value as the magnetic field increases. The viscosity curve has an overshoot profile and this overshoot appears at a larger value of the magnetic field strength for the case of a larger Peclet number. Moreover, the viscosity increases more significantly for a larger aspect ratio or for a more oblate hematite particle. In a sedimentation process under the gravitational field, the translational diffusion coefficient decreases with increasing magnetic field strength in the present case of the magnetic field direction.
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Tian, Lin, et Goodarz Ahmadi. « Effect of Brownian Dynamics on Ellipsoidal Fibers in Human Tracheobronchial Airways ». Dans ASME/JSME/KSME 2015 Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/ajkfluids2015-32335.

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In vitro and vivo studies and observation of patients’ tissues have linked the occurrence of respiratory cancer to human exposure to asbestos fibers. While substantial evidences identified the ultra-fine fibers with diameter < 0.25 μm posing the highest carcinogenicity, the details of such correlation is still not fully understood. Particles in the submicron range are known to exhibit random Brownian motion and the intensity are well correlated to inversely to the particle dimension. The process of fiber Brownian motion and the extent that it affects the fiber transport and deposition in human tracheobronchial airways is very important but largely unknown. In this study, the motions of ultra-thin fibers were analyzed by solving the system of coupled equations for translational and rotation motion of fibers under the action of hydrodynamic drag and torque, shear induced lift, gravitational sedimentation, turbulence dispersion and Brownian diffusion in a human airway bifurcation model. Based on the performed simulations, the relationship of fibers’ hydrodynamic characteristics and Brownian dynamics on the fibers’ transport behavior were quantitatively explored. The carcinogenicity if fibers in the light of new findings was discussed.
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Okada, Kazuya, et Akira Satoh. « Analysis of a Stokes Flow Past a Cube (Friction and Diffusion Coefficients for Brownian Dynamics Simulations) ». Dans ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-10549.

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Abstract Magnetorheological properties significantly depend on the regime of aggregate structures. In the case of cubic particles, closely-packed clusters that are significantly different from those for the case of spherical or rod-like particles are formed in the system since magnetic cube-like particles prefer a face-to-face contact with the neighboring particles. Therefore, a cubic particle suspension is expected to exhibit a sufficiently strong magnetorheological effect, which may be investigated by means of Brownian dynamics simulations. However, the translational and rotational diffusion (or friction) coefficients of a cube are not known and indispensable in order to develop this simulation technique. From this background, in the present study, we have analyzed the flow field around a cube in a Stokes flow regime in order to estimate the diffusion (or friction) coefficients of cube-like particles that are required for performing Brownian dynamics simulations of a cubic particle suspension. In the situation of a uniform flow field with a Reynolds number sufficiently smaller than unity, the force acts on the cube only in the flow field direction, and the torque acting on the cube may be regarded as negligible. In the situation of a rotational flow field with a sufficiently low Reynolds number, the torque acts on the cube only in the direction of angular velocity of the rotational flow field, and the force negligibly act on the cube. These characteristics are in significantly similar to those for the case of spheres in a Stokes flow situation. From these results, we may conclude that the diffusion coefficients of cube-like particles can be expressed by introducing a correction factor to those of the spherical particles.
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