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Dissertations / Theses on the topic 'DSMC'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 March 2023

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1

Piekos, Edward S. (Edward Stanley). "DSMC modeling of micromechanical devices." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11149.

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2

Lunde, Dominic Charles. "A Homegrown DSMC-PIC Model for Electric Propulsion." DigitalCommons@CalPoly, 2019. https://digitalcommons.calpoly.edu/theses/2066.

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Powering spacecraft with electric propulsion is becoming more common, especially in CubeSat-class satellites. On account of the risk of spacecraft interactions, it is important to have robust analysis and modeling tools of electric propulsion engines, particularly of the plasma plume. The Navier-Stokes equations used in classic continuum computational fluid dynamics do not apply to the rarefied plasma, and therefore another method must be used to model the flow. A good solution is to use the DSMC method, which uses a combination of particle modeling and statistical methods for modeling the sim
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3

Palaniswaamy, Geethpriya. "DSMC multicomponent aerosol dynamics sampling algorithms and aerosol processes /." Diss., Columbia, Mo. : University of Missouri-Columbia, 2007. http://hdl.handle.net/10355/4737.

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Thesis (Ph. D.)--University of Missouri-Columbia, 2007.<br>The entire dissertation/thesis text is included in the research.pdf file; the official abstract appears in the short.pdf file (which also appears in the research.pdf); a non-technical general description, or public abstract, appears in the public.pdf file. Title from title screen of research.pdf file (viewed Dec. 12, 2007). Vita. Includes bibliographical references.
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4

Palharini, Rodrigo Cassinel. "Atmospheric reentry modelling using an open-source DSMC code." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=24375.

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Aerothermodynamic investigations of hypersonic re-entry vehicles provides crucial information to other key disciplines as structures and materials, assisting the development of efficient and lightweight thermal protection systems (TPS). Under the transitional flow regime, where chemical and thermal nonequilibrium are predominant, the most successful numerical method for such studies has been the direct simulation Monte Carlo (DSMC) numerical technique. In the present work, the solver dsmcFoam has been benchmarked against experimental, numerical, and theoretical data found in the open literatur
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Masters, Nathan Daniel. "Efficient Numerical Techniques for Multiscale Modeling of Thermally Driven Gas Flows with Application to Thermal Sensing Atomic Force Microscopy." Diss., Georgia Institute of Technology, 2006. http://hdl.handle.net/1853/11574.

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The modeling of Micro- and NanoElectroMechanical Systems (MEMS and NEMS) requires new computational techniques that can deal efficiently with geometric complexity and scale dependent effects that may arise. Reduced feature sizes increase the coupling of physical phenomena and noncontinuum behavior, often requiring models based on molecular descriptions and/or first principles. Furthermore, noncontinuum effects are often localized to small regions of (relatively) large systemsprecluding the global application of microscale models due to computational expense. Multiscale modeling couples efficie
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Al-Mohssen, Husain Ali 1977. "An excursion with the Boltzmann equation at low speeds : variance-reduced DSMC." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61591.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2010.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 133-139).<br>The goal of the present thesis is to develop a practical method for simulating low-signal kinetic (small-scale) gaseous flows. These flows have recently received renewed attention in connection with the design and optimization of MEMS/NEMS devices operating in gaseous environments; they are typically described using the Boltzmann equation which is most efficiently solved using a stochastic particle simula
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7

Al-Kouz, Wael G. "Investigation of Supersonic Gas Flows into Nanochannels Using an Unstructured 3D Direct Simulation Monte Carlo Method." Digital WPI, 2009. https://digitalcommons.wpi.edu/etd-dissertations/317.

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"This dissertation is devoted to the computational investigation of supersonic gas flows in rectangular nanochannels with scales between 100 nm and 1000 nm, using an unstructured three-dimensional Direct Simulation Monte Carlo (U3DSMC) methodology. This dissertation also contributes to the computational mathematics background of the U3DSMC method with validations and verifications at the micronscale and nanoscale, as well as with the investigation of the statistical fluctuations and errors associated with U3DSMC simulations at the nanoscale. The U3DSMC code is validated by comparisons wit
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8

Oh, David Y. (David Younghee). "Computational modeling of expanding plasma plumes in space using a PIC-DSMC algorithm." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/10756.

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9

Cave, Hadley Mervyn. "Development of Modelling Techniques for Pulsed Pressure Chemical Vapour Deposition (PP-CVD)." Thesis, University of Canterbury. Mechanical Engineering, 2008. http://hdl.handle.net/10092/1572.

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In this thesis, a numerical and theoretical investigation of the Pulsed Pressure Chemical Vapour Deposition (PP-CVD) progress is presented. This process is a novel method for the deposition of thin films of materials from either liquid or gaseous precursors. PP-CVD operates in an unsteady manner whereby timed pulsed of the precursor are injected into a continuously evacuated reactor volume. A non-dimensional parameter indicating the extent of continuum breakdown under strong temporal gradients is developed. Experimental measurements, supplemented by basic continuum simulations, reveal that spa
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10

Rose, Martin. "Untersuchungen zur Oberflächenchemie der Atomlagenabscheidung und deren Einfluss auf die Effizienz von Prozessen." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-63111.

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In dieser Arbeit werden verschiedene Prozesse zur Atomlagenabscheidung (ALD) von TiO2 und HfO2 experimentell untersucht. Die Untersuchungen schließen eine experimentelle Charakterisierung des Schichtwachstums sowie eine massenspektrometrische Analyse der Reaktionsprodukte ein. Im Detail wurden der ALD-Prozess mit Cp*Ti(OMe)3 und Ozon zur Abscheidung von TiO2 sowie der ALD-Prozess mit TEMAHf und Ozon zur Abscheidung von HfO2 untersucht. Der theoretische Teil der Arbeit beginnt mit einer Methode zur Bestimmung des absoluten Haftkoeffizienten. Anschließend werden numerische Modelle entwickelt, we
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11

Si, Hadj Mohand Hacene. "Micro-vélocimétrie par marquage moléculaire adaptée aux écoulements gazeux confinés." Thesis, Toulouse, INSA, 2015. http://www.theses.fr/2015ISAT0039.

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Nous présentons dans cette thèse une adaptation de la technique de vélocimétrie par marquage moléculaire (MTV) aux micro-écoulements gazeux. Les effets de luminescence de l’acétone gazeuse excitée par un rayonnement UV, mis en jeu dans la MTV, ont été analysés en vue d’une application en vélocimétrie à basse pression. La phosphorescence de l’acétone diminue fortement avec la pression, pour devenir non détectable à des pressions de l’ordre du kPa. En revanche, la fluorescence reste détectable à des pressions de l’ordre de la dizaine de Pa. L’analyse des déplacements de molécules luminescentes a
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12

Chen, Jie. "Numerical and experimental analysis of flows generated by temperature fields in rarefied gas : application to the design of Knudsen micropumps." Thesis, Toulouse, INSA, 2016. http://www.theses.fr/2016ISAT0009/document.

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Cette thèse présente une étude numérique et expérimentale d’écoulements gazeux raréfiés confinés, induits par gradients thermiques. L’écoulement d’un gaz raréfié peut en effet être généré en appliquant uniquement un gradient tangentiel de température le long d'une paroi. Ainsi, sans gradient initial de pression, le gaz peut se déplacer de la région froide vers la région chaude. Ce phénomène, appelé transpiration thermique, est à la base du fonctionnement des pompes dites de Knudsen, capables de générer un pompage du gaz sans utiliser de pièces mécaniques mobiles. L’apport principal de ce trava
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13

Wang, Ye. "Ecoulement dans une pompe à vide turbomoléculaire : modélisation et analyse par voie numérique." Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI062/document.

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La thèse est consacrée à la modélisation et à l'analyse par voie numérique de l'écoulement dans une pompe à vide turbomoléculaire hybride, combinant une succession d'étages de type rotor et stator et un Holweck. Une approche de type Test Particle Monte Carlo 3D a été développée pour des configurations de pompes industrielles (géométries complexes d'aubes, gestion des étages rotor et stator) dans un souci d'optimisation des coûts de simulation. L'outil numérique développé a été validé pour des configurations académiques et industrielles, en s'appuyant notamment sur des résultats expérimentaux o
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14

Damazo, Graciliano Antonio. "Controle com modos deslizantes aplicado em sistemas com atraso e acesso somente à saída /." Ilha Solteira : [s.n.], 2008. http://hdl.handle.net/11449/87264.

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Orientador: José Paulo Fernandes Garcia<br>Banca: Laurence Duarte Colvara<br>Banca: Ivan Nunes da Silva<br>Resumo: O enfoque principal do trabalho foi dado ao Controle Discreto com Modos Deslizantes(CDMD) aplicado em sistemas que possuem atraso no processamento do sinal de controle e acesso somente à saída do sistema. A estratégia de controle tem por objetivo a utilização de técnicas de controle com modos deslizantes para a elaboração de uma lei de controle simples e robusta às incertezas da planta e ao atraso. O observador de estados apresentado possui características de modo deslizante, o qu
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15

Reyhanian, Mashhadi Mehrnaz. "Simulation numérique par la méthode Monte Carlo (DSMC) et modélisation analytique d'un mélange gazeux dans un micro canal." Paris 6, 2011. http://www.theses.fr/2011PA066396.

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Ce travail porte sur des simulations numériques par la méthode DSMC (Direct Simulation Monte Carlo) de l'écoulement raréfié d'un mélange de deux gaz entrant, soit séparément, soit déjà mélangés, dans un micro canal. Dans le cas de deux gaz déjà mélangés, les paramètres permettant de retrouver les valeurs d'initialisation sont étudiés. En tenant compte de ces résultats pour l'étude de l'écoulement de deux gaz séparés et leur mélange, des facteurs influant sur la longueur de mélange sont analysés. On a tenté de diminuer cette longueur en étudiant les effets de quelques paramètres géométriques, c
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16

Wishart, Stuart Jackson. "A Parallel Solution Adaptive Implementation of the Direct Simulation Monte Carlo Method." University of Sydney. School of Aerospace, Mechanical and Mechatronic Engineering, 2005. http://hdl.handle.net/2123/619.

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This thesis deals with the direct simulation Monte Carlo (DSMC) method of analysing gas flows. The DSMC method was initially proposed as a method for predicting rarefied flows where the Navier-Stokes equations are inaccurate. It has now been extended to near continuum flows. The method models gas flows using simulation molecules which represent a large number of real molecules in a probabilistic simulation to solve the Boltzmann equation. Molecules are moved through a simulation of physical space in a realistic manner that is directly coupled to physical time such that unsteady flow cha
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17

Hammel, Jeffrey Robert. "Development of an unstructured 3-D direct simulation Monte Carlo/particle-in-cell code and the simulation of microthruster flows." Link to electronic thesis, 2002. http://www.wpi.edu/Pubs/ETD/Available/etd-0510102-153614.

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18

Wishart, Stuart Jackson. "A Parallel Solution Adaptive Implementation of the Direct Simulation Monte Carlo Method." Thesis, The University of Sydney, 2004. http://hdl.handle.net/2123/619.

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This thesis deals with the direct simulation Monte Carlo (DSMC) method of analysing gas flows. The DSMC method was initially proposed as a method for predicting rarefied flows where the Navier-Stokes equations are inaccurate. It has now been extended to near continuum flows. The method models gas flows using simulation molecules which represent a large number of real molecules in a probabilistic simulation to solve the Boltzmann equation. Molecules are moved through a simulation of physical space in a realistic manner that is directly coupled to physical time such that unsteady flow cha
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19

Mertz, Helene. "Modélisation des réactions chimiques dans un code de simulation par la méthode Monte Carlo." Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLV012/document.

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Les méthodes Direct Simulation Monte Carlo (DSMC) sont utilisées par Ariane group pour calculer les torseurs d'efforts aérodynamiques et les flux thermiques sur les engins spatiaux pour des écoulements hypersoniques en milieu raréfié.Afin de pouvoir caractériser la dislocation des étages de lanceurs et donc l'empreinte de retombée de débris, une modélisation précise des mécanismes générateurs de flux thermiques est nécessaire. Les réactions chimiques étant dimensionnantes pour le calcul du flux thermique, l'objectif de cette thèse est de développer l'outil de calcul avec la méthode DSMC nommé
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20

Rojas, cardenas Marcos javier. "Temperature gradient induced rarefied gas flow." Thesis, Aix-Marseille, 2012. http://www.theses.fr/2012AIXM4797.

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Ce manuscrit présente l'étude et l'analyse d'écoulements de gaz raréfiés, induits par la transpiration thermique. Le terme de transpiration thermique désigne le mouvement macroscopique d'un gaz raréfié engendré par l'effet du seul gradient de température. L'aspect principal de ce travail est centré autour de la mesure du débit stationnaire déclenché en soumettant un micro tube à un gradient de température appliqué le long de son axe. On a développé à cet effet un appareillage expérimental original ainsi qu'une méthodologie expérimentale innovatrice basée sur la dépendance du phénomène, analysé
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21

Gokaltun, Seckin. "Lattice Boltzmann Method for Flow and Heat Transfer in Microgeometries." FIU Digital Commons, 2008. http://digitalcommons.fiu.edu/etd/64.

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Recent technological developments have made it possible to design various microdevices where fluid flow and heat transfer are involved. For the proper design of such systems, the governing physics needs to be investigated. Due to the difficulty to study complex geometries in micro scales using experimental techniques, computational tools are developed to analyze and simulate flow and heat transfer in microgeometries. However, conventional numerical methods using the Navier-Stokes equations fail to predict some aspects of microflows such as nonlinear pressure distribution, increase mass flow ra
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22

Torres, Erik [Verfasser], and Stefanos [Akademischer Betreuer] Fasoulas. "Ab initio quantum-chemistry database for N2 (v, J) + N in a state-to-state implementation of the DSMC method / Erik Torres ; Betreuer: Stefanos Fasoulas." Stuttgart : Universitätsbibliothek der Universität Stuttgart, 2017. http://d-nb.info/1143597060/34.

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23

Damazo, Graciliano Antonio [UNESP]. "Controle com modos deslizantes aplicado em sistemas com atraso e acesso somente à saída." Universidade Estadual Paulista (UNESP), 2008. http://hdl.handle.net/11449/87264.

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Made available in DSpace on 2014-06-11T19:22:36Z (GMT). No. of bitstreams: 0 Previous issue date: 2008-06-11Bitstream added on 2014-06-13T20:09:52Z : No. of bitstreams: 1 damazo_ga_me_ilha.pdf: 760851 bytes, checksum: d1a0f2a22e4917da6787ce545199a696 (MD5)<br>Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)<br>O enfoque principal do trabalho foi dado ao Controle Discreto com Modos Deslizantes(CDMD) aplicado em sistemas que possuem atraso no processamento do sinal de controle e acesso somente à saída do sistema. A estratégia de controle tem por objetivo a utilização de técn
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24

Zachreson, Matthew R. "Comparing Theory and Experiment for Analyte Transport in the First Vacuum Stage of the Inductively Coupled Plasma Mass Spectrometer." BYU ScholarsArchive, 2012. https://scholarsarchive.byu.edu/etd/3538.

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The Direct Simulation Monte Carlo algorithm as coded in FENIX is used to model the transport of trace ions in the first vacuum stage of the inductively coupled plasma mass spectrometer. Haibin Ma of the Farnsworth group at Brigham Young University measured two radial trace density profiles: one 0.7 mm upstream of the sampling cone and the other 10 mm downstream. We compare simulation results from FENIX with the experimental results. We find that gas dynamic convection and diffusion are unable to account for the experimentally-measured profile changes from upstream to downstream. Including disc
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25

Kohen, Nicolas. "Physique et modélisation d'une source d'ions négatifs pour l'injection du faisceau de neutres sur ITER." Thesis, Toulouse 3, 2015. http://www.theses.fr/2015TOU30035/document.

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La source d'ions des injecteurs de neutres d'ITER devra produire un fort courant d'ions négatifs de deutérium qui seront accélérés puis neutralisés afin d'obtenir un faisceau d'atomes qui chauffera le plasma thermonucléaire. Un plasma froid d'hydrogène à basse pression et forte puissance est généré par induction dans la source et les ions négatifs sont produits par des réactions en volume et en surface et extraits à travers une série de grilles électrostatiques. Cette thèse est consacrée à la modélisation de ce plasma, afin d'étudier des phénomènes peu abordés à ce jour : aspect hors équilibre
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26

Chamberlin, Ryan Earl. "A three-dimensional direct simulation Monte Carlo methodology on unstructured Delaunay grids with applications to micro and nanoflows." Worcester, Mass. : Worcester Polytechnic Institute, 2007. http://www.wpi.edu/Pubs/ETD/Available/etd-032907-092912/.

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27

Somers, William R. "Testing Direct Simulation Monte Carlo Methods Against the Fluid Equations in the Inductively Coupled Plasma Mass Spectrometer." Diss., CLICK HERE for online access, 2008. http://contentdm.lib.byu.edu/ETD/image/etd2621.pdf.

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28

Nanson, III Richard A. "Navier/Stokes/Direct Simulation Monte Carlo Modeling of Small Cold Gas Thruster Nozzle and Plume Flows." Digital WPI, 2002. https://digitalcommons.wpi.edu/etd-theses/254.

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This study involves the modeling of small cold-gas (N2) thrusters nozzle and plume flows, their interactions with spacecraft surfaces and the induced pressure environment. These small cold-gas thrusters were used for pitch, yaw and roll control and were mounted on the bottom of the conical Environmental Monitor Payload (EMP) suborbital spacecraft. The pitch and yaw thrusters had 0.906 mm throat diameter and 4.826 mm exit diameter, while the roll thrusters had 1.6 mm throat diameter and 5.882 mm exit diameter. During thruster firing, at altitudes between 670 km and 1200 km, pressure measurem
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29

Ameur, Djilali. "Modélisation analytique et simulation numérique par la méthode de Monte-Carlo d'un écoulement de gaz dans des micro-canaux." Paris 6, 2008. http://www.theses.fr/2008PA066102.

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L’objectif de la thèse est de modéliser l’écoulement d’un gaz (azote) dans des micro-filtres. La région du filtrage est une membrane qui contient des orifices, en fait des micro-canaux, dont le diamètre est de quelques micromètres. Au voisinage de chaque orifice, l’écoulement du gaz supposé normal à la membrane, est en régime de raréfaction dit de ‘transition’, intermédiaire entre le régime continu relevant des équations de Navier-Stokes et le régime moléculaire libre où les molécules du gaz évoluent sans interactions entre elles. Deux approches sont utilisées pour analyser l’écoulement dans u
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30

Zachreson, Matthew R. "Comparing Theory and Experiment for Analyte Transport in the First Vacuum Stage of the Inductively Coupled Plasma Mass Spectrometer." BYU ScholarsArchive, 2015. https://scholarsarchive.byu.edu/etd/5610.

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The inductively coupled plasma mass spectrometer (ICP-MS) has been used in laboratories for many years. The majority of the improvements to the instrument have been done empirically through trial and error. A few fluid models have been made, which have given a general description of the flow through the mass spectrometer interface. However, due to long mean free path effects and other factors, it is very difficult to simulate the flow details well enough to predict how changing the interface design will change the formation of the ion beam. Towards this end, Spencer et al. developed FENIX,
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31

Sade, Asli. "Interaction Of The Non Steroidal Anti-inflammatory Drug Celecoxib With Pure And Cholesterol-containing Model Membranes." Master's thesis, METU, 2009. http://etd.lib.metu.edu.tr/upload/3/12610749/index.pdf.

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The interactions of the non steroidal anti-inflammatory drug celecoxib with pure and cholesterol containing distearoyl phosphatidylcholine multilamellar vesicles were studied using Fourier transform infrared spectroscopy, differential scanning calorimetry and turbidity technique at 440 nm. The results reveal that celecoxib exerts opposing effects on membrane order in a concentration dependent manner while cholesterol disorders and orders the membrane in the gel and liquid crystalline phase, respectively. Ternary mixtures of DSPC/Cholesterol/celecoxib behave similar to cholesterol with a smal
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32

Shabani, Shahpar. "Pure Java interface to a DSMS : Pure Java interface to a DSMS." Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-423975.

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SCSQ (Scalable Stream Query processor) is a data stream management system (DSMS) that allows different kinds of distributed high-volume infinite streams to be queried. The current Java interface to SCSQ usesC libraries to communicate between Java and a SCSQ server. Therefore, a pure Java client-server interface to SCSQ is needed. Unlike regular databases, DSMS can process queries over infinite streams. Such continuous queries (CQs) are running until they are explicitlyterminated. The interface must be able to process infinite scans of continuous query results. This master thesis implements a p
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33

Varum, Tiago Miguel Valente. "Antena para comunicações DSRC." Master's thesis, Universidade de Aveiro, 2010. http://hdl.handle.net/10773/4482.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>Dadas as suas características, a utilização das antenas microstrip tem aumentado nos sistemas de comunicações sem fio, em diferentes projectos. A sua simplicidade aliada ao baixo custo permitem desenvolver quer antenas quer agregados de antenas com elevada qualidade e eficiência, que podem ser usadas nas mais diversas aplicações do dia-a-dia. Uma das aplicações possíveis das antenas microstrip são as comunicações dedicadas de curto alcance (DSRC) muito usadas no controlo de veículos nas estradas. No âmbito desta temática, foi proj
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Rito, Pedro Filipe Vieira. "Recetor SDR para comunicações DSRC." Master's thesis, Universidade de Aveiro, 2011. http://hdl.handle.net/10773/8614.

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Mestrado em Engenharia Electrónica e Telecomunicações<br>Nos ultimos anos, um dos focos de investigação tem sido a conceção e inclusão de sistemas inteligentes no tráfego rodoviário. Chamados Intelli- gent Transportation Systems (ITS), têm como nalidade minimizar o tempo perdido em congestionamentos, consumo de energia e danos ambientais, humanos e materiais, tentando assim contribuir para a sustentabilidade do setor. Um dos exemplos mais conhecidos e a cobrança eletrónica de taxas, Electronic Fee Collection (EFC). O EFC usa comunicações sem os de curto alcance, normalmente definida
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Bæren, Mats Møller. "Antenne til bruk i DSRC-brikke." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-19062.

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DSRC er et system for enveis eller toveis tr&#229;dl&#248;s kommunikasjon med kort til medium rekkevidde,som blant annet brukes til &#229; automatisere innkreving av bompenger i de st&#248;rste byene i Norge.Systemet benytter en interrogator og en DSRC-brikke popul&#230;rt kalt bompengebrikke. DSRCbrikkenmodulerer inn en unik identifikasjon p&#229; signalet den f&#229;r fra interrogatoren, som foreksempel kan brukes til &#229; identifisere brukeren som passerer igjennom en bompengering.NORBIT er et firma lokalisert i Trondheim som utvikler og produserer DSRC-produkter, blandtannet til det nors
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36

Thorsrud, Einar. "Programvaredefinert radio : Mulige hyllevareløsninger for DSRC-anvendelser." Thesis, Norwegian University of Science and Technology, Department of Electronics and Telecommunications, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-10507.

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<p>Utviklingen innen radiokommunikasjon går i retning av rekonfigurerbare programvaredefinerte radioer, der funksjonaliteten og signalbehandlingen er implementert i programvare. Fremveksten av standardiserte maskinvareplattformer og programvarerammeverk, som gjør det mulig å utvikle nye og fleksible radioer ved hjelp av hyllevarer, er et resultat av dette. To sentrale frie rammeverk for programvaredefinert radio er: GNU Radio, et selvstendig rammeverk; og «Open Source SCA Implementation::Embedded», en fri implementering av «Software Communications Architecture». Denne masteroppgaven undersø
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37

Shiue, Gueng-Shuen, and 薛光舜. "DSMC Simulation of 2D Convergent Micronozzle Flow." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/88811217048227124250.

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碩士<br>國防大學理工學院<br>航空太空工程碩士班<br>99<br>In this study, it uses Direct Simulation Monte Carlo (DSMC) method with trapezoidal meshes to simulate characteristics of flows field for two-dimensional convergent micronozzle. The influence of the micro/nanoscale rarefied gas effects on flow characteristics were investigated and analyzed. First, real three-dimensional micronozzle flow field use simplified to a two–dimensional convergent micronozzle. Modified no time counter (M-NTC) rule is applied on the selection of representative collision pairs. Different reflect boundary conditions, such as specular/d
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38

Le, Minmin. "DSMC simulation of flows in multiple microchannel geometries." Thesis, 2006. http://spectrum.library.concordia.ca/8880/1/MR16251.pdf.

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The direct simulation Monte Carlo method was applied to simulate the flows in uniform, parallel, series, and T-shape microchannels. For the uniform microchannel case, both the supersonic and subsonic flows have been considered. The effect of the Knudsen number (Kn) on the flow properties and the heat transfer characteristics were investigated. Some significant flow features, such as the flow acceleration along the channel, the nonlinear pressure distribution, and the velocity slip near the wall, due to the compressibility and the rarefaction of the microflow were specified. Most of the wall he
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39

Soo, Jar Nan, and 蘇嘉南. "Three Dimensional DSMC Analysis of Supersonic Microchannel Flow." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/36413675929940833373.

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碩士<br>國立成功大學<br>機械工程學系<br>88<br>The microchannel is a very important element in Microelectro- mechanical system, and the gas flow in the channel will affect the performance of microsystem directly. Hence, the regime of interaction between microchannel and working gas becomes a serious topic. Because of the approach of characteristic length of microchannel to the mean free path of working gas, the thesis takes advantage of the concept of probability and statistics to simulate the behavior of molecules in the system with the theory of molecular gas dynamics, and then show t
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40

Hung, Nien-Tzu, and 洪念慈. "DSMC Simulation of 3-D Micro-channel Flows." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/79689220045967791712.

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碩士<br>淡江大學<br>機械與機電工程學系<br>92<br>In this paper, the direct simulation Monte Carlo has been applied to compute 3-D Low-speed Micro-channel Flows, then compare with the difference in 2-D and 3-D flows. Variation of the Knudsen number is obtained by change the inlet pressure while keeping the pressure ratio. The effects of varying Knudsen number on flow property were investigated. The VHS model and Nitrogen has been applied. The result shows that simulation of 3-D differs a lot from 2-D. In the velocity distribution, the result of the 3-D is lower than 2-D,about only 65% of 2-D,because
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41

Luo, Wen-Bin, and 羅文彬. "DSMC Simulation of 2-D Micro-channel Flows." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/82193636833952538195.

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碩士<br>淡江大學<br>機械與機電工程學系<br>92<br>In this paper, the DSMC method was employed to investigate the flow properties in microchannels with different wall temperature and the heat transfer phenomenon between the fluid and the channel walls. The molecular collisions are simulated using the variable hard sphere (VHS) molecular model. The results of supersonic flows in microchannels show that the temperature increases near the entrance and decreases as the flow develops downstream. The subsonic flows in microchannels are simulated by different wall temperature. The higher wall tem
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42

Lo, Chung-Yeu, and 羅仲禹. "DSMC of Gaseous Flow and Heat Transfer in Microchannel." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/86644974844481757793.

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碩士<br>國防大學中正理工學院<br>兵器系統工程研究所<br>89<br>The study of micro-channel flow is partly in response to the need for thermal control in the operation of MEMS in which the range of gas flow is from slip flow to transition regime. It will lead to incorrect results if we consider gas flow in micro-channel as continuum phenomena. In this paper, molecular approach DSMC has been used to study the flow and heat transfer characteristic of rarefied gas in micro-channel. In one-dimensional simulation, a constant acceleration body force is applied to the system and the flow is restricted in laminar an
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43

Shing, Cheng Tine, and 鄭廷訓. "The Design of Turbo Molecular Pump by DSMC Method." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/54819278991906241790.

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碩士<br>國立屏東科技大學<br>機械工程系<br>92<br>Turbo molecular pump can provide good air-removal effect in free molecular flow to the ultra high vacuum status. The blade geometries and arrangement have a great influence on pump speed and compression ratio. In this research, direct simulation of Monte Carlo method is adopted to check to specific parameters influence on the pump speed and compression ratio. Parameters need include: blade geometries, rotor blade angle and stator blade angle , blade spacing ratio and blade chord (s/b ratio), and rotational speed. Also the blade geometry is optimized by the Tagu
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44

Cheng, Chun-Chang, and 陳均彰. "Mixing Analysis of a Scramjet engine via DSMC method." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/41993388924996868161.

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碩士<br>淡江大學<br>機械與機電工程學系碩士班<br>100<br>Supersonic combustion ramjet engine work flow field are thin. Therefore, We have to use micro particle to analyze. The macro continuum hypothesis is no longer suitable. This article use one of the Numerical Solution to simulate DSMC. It is precise and used a lot of analyze recently. This article adopted the variety of Scramjet inner flow field by DSMC. We consider the situation of fuel ignition and air mixing. How to achieve good mixing efficiency has become concerned about the direction of the research, therefore, for a variety of different the combust
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45

Hsu, Che-Kang, and 許哲綱. "Parametric Study of Spiral Drag Pump Using The DSMC Method." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/79417308048265918726.

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碩士<br>國立交通大學<br>機械工程系<br>91<br>Numerical simulations of rarefied gas flows in spiral drag pump (SDP) channel are carried out by using the three-dimensional unstructured direct simulation Monte Carlo (DSMC) method. Using Variable Hard Sphere (VHS) molecular model, No Time Counter (NTC) collision sample and variable time-step method (VTS) to simulate the molecular collision kinetics and use Cell-By-Cell particle tracing method complete the part of molecular move. According to Nanbu et al. (1991) experiment condition, to simulate a real three-dimension model on SDP geometry parameter (include dep
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46

Shih, Chang-Chieh, and 施長杰. "DSMC Analysis of Rarefied Gas Flow Over a Flat Plate." Thesis, 1997. http://ndltd.ncl.edu.tw/handle/89243114582690735457.

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碩士<br>大同工學院<br>機械工程學系<br>85<br>The present study is concerned with the flow behaviors of the rarefied gas over a flat plate. The Direct Simulation of Monte Carlo Method (DSMC) is employed to examine the effects of the physical parameters, such as the Knudsen number, Mach number, angle of attack of the incoming flow, and the plate length, on the flow patterns as well as the pressure and the skin friction coefficients. In order to ensure the validity ofthe n
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47

Titov, Evgeny V. "Application of the DSMC method to high density micro-flows /." 2007. http://etda.libraries.psu.edu/theses/approved/WorldWideIndex/ETD-2105/index.html.

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48

Lin, Shin-Chieh, and 林士傑. "DSMC Simulation of the Subsonic Flow Past a Vertical Plate." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/36965453204015601503.

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碩士<br>國立交通大學<br>機械工程系所<br>96<br>The phenomena of vortex shedding associated with the subsonic external flow problems in different length scales are visible everywhere in fluid dynamics. For example, aviation of fruit flies and birds, driving car in the wind, flowing river through piers under a bridge, and the air current interaction with an island and so forth. A large number of experimental and numerical studies have been reported on the vortex-shedding flows in the continuum limit, while there have been very few studies focusing on similar flows in the rarefied gas regime. Major obstacle of
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49

Strand, James Stephen. "Statistical methods for the analysis of DSMC simulations of hypersonic shocks." Thesis, 2012. http://hdl.handle.net/2152/ETD-UT-2012-05-5384.

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In this work, statistical techniques were employed to study the modeling of a hypersonic shock with the Direct Simulation Monte Carlo (DSMC) method, and to gain insight into how the model interacts with a set of physical parameters. Direct Simulation Monte Carlo (DSMC) is a particle based method which is useful for simulating gas dynamics in rarefied and/or highly non-equilibrium flowfields. A DSMC code was written and optimized for use in this research. The code was developed with shock tube simulations in mind, and it includes a number of improvements which allow for the efficient simulation
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Huang, Ying-Hsiang, and 黃盈翔. "DSMC Simulation of 3-D backward-facing step flow at microscale." Thesis, 2006. http://ndltd.ncl.edu.tw/handle/53wmm9.

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碩士<br>淡江大學<br>機械與機電工程學系碩士班<br>94<br>The Direct Simulation Monte Carlo (DSMC) method has been employed to analyze the rationality of the 2-D simplification for a 3-D backward-facing step flow. An mass flux treatment for low-speed inflow and outflow boundaries for the DSMC of the microchannel flow is employed. The VHS model and Nitrogen was employed in the simulation. The 3-D microchannel flows is simulated with the cross aspect ratio in the range of 1 and 5. The calculated flow properties in the 3-D cases are compared with the results of the 2-D case. It shows that when the aspect ratio &amp;lt
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