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Dissertations / Theses on the topic 'Rarefied gas dynamics'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Tsuji, Tetsuro. "Studies on Moving Boundary Problems in Rarefied Gas Dynamics." 京都大学 (Kyoto University), 2013. http://hdl.handle.net/2433/174878.

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2

Huang, Chao-Ming. "Experimental study of pressure difference phenomena in rarefied gases /." free to MU campus, to others for purchase, 1996. http://wwwlib.umi.com/cr/mo/fullcit?p9812957.

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3

Chiu, Sam Hsieh-Hsiang. "Using an expansion tube to generate rarefied hypervelocity gas flows /." [St. Lucia, Qld.], 2004. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe18701.pdf.

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4

Mizzi, Simon. "Extended macroscopic models for rarefied gas dynamics in micro-sized domains." Thesis, University of Strathclyde, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.501879.

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5

Wheatley, Vincent. "Modelling low-density flow in hypersonic impulse facilities /." [St. Lucia, Qld.], 2001. http://www.library.uq.edu.au/pdfserve.php?image=thesisabs/absthe16173.pdf.

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6

Roveda, Roberto. "A combined discrete velocity particle based numerical approach for continuum/rarefied flows /." Full text (PDF) from UMI/Dissertation Abstracts International, 2000. http://wwwlib.umi.com/cr/utexas/fullcit?p3004370.

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7

Parsons, Timothy Langdon. "Object-reuse-oriented design of direct simulation Monte-Carlo software for rarefied gas dynamics." Thesis, Imperial College London, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314287.

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8

Mori, Hideo, Tomohide Niimi, Madoka Hirako, and Hiroyuki Uenishi. "Pressure Sensitive Paint Suitable to High Knudsen Number Regime." IOP, 2006. http://hdl.handle.net/2237/6960.

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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

Leimkuehler, Thomas O. "Investigation of low-pressure laser induced fluorescence for measuring temperature profiles in a rarefied gas /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9999301.

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11

Gu, Yuxing. "Measurements of temperature and density profiles of iodine vapor between parallel plates in the transition regime using laser induced fluorescence /." free to MU campus, to others for purchase, 2000. http://wwwlib.umi.com/cr/mo/fullcit?p9974999.

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12

Morris, Aaron Benjamin. "Investigation of a discrete velocity Monte Carlo Boltzmann equation." Thesis, [Austin, Tex. : University of Texas, 2009. http://hdl.handle.net/2152/ETD-UT-2009-05-127.

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13

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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14

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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15

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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16

Valougeorgis, Dimitris V. "The Fn method in kinetic theory." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/49949.

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A complete formulation of the recently developed. F<sub>N</sub> method in kinetic theory is presented and the accuracy of this advanced semi-analytical-numerical technique is demonstrated by testing the method to several classical problems in rarefied gas dynamics. The method is based on the existing analysis for the vector transport equation arising from the decomposition of the linearized BGK equation. Using full-range orthogonality, a system of singular integral equations for the distribution functions at the boundaries is established. The unknown distribution functions are then approximat

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17

Walus, Wlodzimierz Ignacy. "Stationary solutions of abstract kinetic equations." Diss., Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/53613.

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The abstract kinetic equation Tψ’=-Aψ is studied with partial range boundary conditions in two geometries, in the half space x≥0 and on a finite interval [0, r]. T and A are abstract self-adjoint operators in a complex Hilbert space. In the case of the half space problem it is assumed that T is a (possibly) unbounded injection and A is a positive compact perturbation of the identity satisfying a regularity condition, while in the case of slab geometry T is a bounded injection and A is a bounded Fredholm operator with a finite dimensional negative part. Existence and uniqueness theory is devel

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18

Kobert, Maria [Verfasser], and Axel [Akademischer Betreuer] Klar. "Application of the Finite Pointset Method to moving boundary problems for the BGK model of rarefied gas dynamics / Maria Kobert. Betreuer: Axel Klar." Kaiserslautern : Technische Universität Kaiserslautern, 2015. http://d-nb.info/1077007167/34.

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19

Kamphorst, Carmo Henrique. "Fluxo de gases rarefeitos em dutos cilíndricos : uma abordagem via equações integrais." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17880.

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Neste trabalho, é estudada a descrição do fluxo de um gás rarefeito em um duto cilíndrico de comprimento infinito. A formulação matemática do problema está baseada na forma integral de equações cinéticas derivadas da Equação de Boltzmann. Particularmente são estudados os modelos cinéticos conhecidos como BGK e S. Métodos espectrais são propostos para obtenção de soluções, em forma fechada, para quantidades de interesse como o perfil de velocidade do gás, bem como taxas de fluxo. As formulações espectrais são baseadas em duas abordagens: expansão clássica em termos de Polinômios de Legendre e e

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20

Scherer, Caio Sarmento. "Efeitos de evaporação em gases rarefeitos." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2009. http://hdl.handle.net/10183/17889.

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Neste trabalho, o fenômeno de evaporação em gases rarefeitos e analisado, para o caso de uma espécie de gás bem como de misturas binárias. Evaporação fraca e forte são consideradas para escoamentos de gases em canal e semi-espaco. Também e investigado o fenômeno conhecido como reverso de temperatura, típico de gases em estado de rarefação. O método ADO, uma versão analítica do método de ordenadas discretas, é utilizado para construção de soluções em forma fechada para os diversos problemas e quantidades de interesse, como perfis de temperatura e fluxos de calor. Para o caso de um gás, uma solu

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21

Carcaud, Pierre. "Étude de quelques modèles cinétiques décrivant le phénomène d'évaporation en gravitation." Phd thesis, Université Rennes 1, 2014. http://tel.archives-ouvertes.fr/tel-01018326.

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L'étude de l'évolution de galaxies, et tout particulièrement du phénomène d'évaporation, a été pour la première fois menée à l'aide de modèles physiques, par Chandrasekhar notamment, dans les années 40. Depuis, de nouveaux modèles plus sophistiqués ont été introduits par les physiciens. Ces modèles d'évolution des galaxies sont des modèles cinétiques; bien connus et bien étudiés par les mathématiciens. Cependant, l'aspect évaporation (le fait que des étoiles sortent du système étudié) n'avait pas encore été étudié mathématiquement, à ma connaissance. La galaxie est vue comme un gaz constitué d

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22

Cromianski, Solange Regina. "SOLUÇÃO DE PROBLEMAS EM SEMIESPAÇO NA DINÂMICA DE GASES RAREFEITOS BASEADA EM MODELOS CINÉTICOS." Universidade Federal de Santa Maria, 2012. http://repositorio.ufsm.br/handle/1/9976.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>The method discrete ordinates is used to solve problems involving rarefied gas dynamics. In this work, a version of the analytical method discrete ordinates (ADO) is used to solve problems in a semi-infinite. The complete analytical development, in cartesian coordinates, the solution of the Thermal-Slip and Viscous-Slip problems is presented, for four kinetic models: BGK model, S model, Gross Jackson model and MRS model in a unified approach. In addition, to describe the interaction between gas and surface, we use the Cercignani-La

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23

Zheng, Yingsong. "Analysis of kinetic models and macroscopic continuum equations for rarefied gas dynamics." 2004. http://hdl.handle.net/1828/662.

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The Boltzmann equation is the basic equation to describe rarefied gas flows. Some kinetic models with simple expressions for the collision term have been proposed to reduce the mathematical complexity of the Boltzmann equation. All macroscopic continuum equations can be derived from the Boltzmann equation or kinetic models through the Chapman-Enskog method, Grad's moment method, etc. This thesis is divided into three parts. In the first part, existing kinetic models (BGK model, ES-BGK model, v(C) -BGK model, S model, and Liu model), and two newly proposed v(C)-ES-BGK type kinetic models

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24

Tharkabhushanam, Sri Harsha 1979. "A conservative deterministic spectral method for rarefied gas flows." 2008. http://hdl.handle.net/2152/17913.

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The mathematical analysis of the Boltzmann equation for a wide range of important models is well developed. It describes physical phenomena which are often of great engineering importance (in aerospace industry, semiconductor design, etc.). For that reason, analytical and computational methods of solving the Boltzmann equation are studied extensively. The idea of describing processes on a scale of the order of the relaxation scales of time and space has been realized. The nonlinear Boltzmann equation possesses the important essence of a physically realistic equation, so it is possible not only

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25

Rahimi, Behnam. "A macroscopic approach to model rarefied polyatomic gas behavior." Thesis, 2016. http://hdl.handle.net/1828/7258.

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A high-order macroscopic model for the accurate description of rarefied polyatomic gas flows is introduced based on a simplified kinetic equation. The different energy exchange processes are accounted for with a two term collision model. The order of magnitude method is applied to the primary moment equations to acquire the optimized moment definitions and the final scaled set of Grad's 36 moment equations for polyatomic gases. The proposed kinetic model, which is an extension of the S-model, predicts correct relaxation of higher moments and delivers the accurate Prandtl (Pr) number. Also, the

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26

Zhang, Ju Goldstein David B. Varghese Philip L. "Simulation of gas dynamics, radiation and particulates in volcanic plumes on Io." 2004. http://repositories.lib.utexas.edu/bitstream/handle/2152/2103/zhangj042.pdf.

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27

Su, Cheng-Chin, and 蘇正勤. "Parallel Direct Simulation Monte Carlo (DSMC) Methods for Modeling Rarefied Gas Dynamics." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/76866430894334062848.

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博士<br>國立交通大學<br>機械工程系所<br>101<br>Rarefied gas dynamics has played an important role in various research disciplines, which include hypersonic fluid dynamics, vacuum pump technology, low-pressure semiconductor related materials processing, and micro- and nano-scale gas dynamics, to name a few. The Boltzmann equation that governs rarefied gas dynamics is generally very difficult to solve. The particle-based method, the direct simulation Monte Carlo (DSMC) method, has been considered as the most efficient and accurate numerical method for solving the Boltzmann equation statistically, as long as t

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28

Mohammadzadeh, Alireza. "Moment method in rarefied gas dynamics: applications to heat transfer in solids and gas-surface interactions." Thesis, 2016. http://hdl.handle.net/1828/7626.

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It is well established that rarefied flows cannot be properly described by traditional hydrodynamics, namely the Navier-Stokes equations for gas flows, and the Fourier’s law for heat transfer. Considering the significant advancement in miniaturization of electronic devices, where dimensions become comparable with the mean free path of the flow, the It is well established that rarefied flows cannot be properly described by traditional hydrodynamics, namely the Navier-Stokes equations for gas flows, and the Fourier's law for heat transfer. Considering the significant advancement in miniaturiz

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29

Lee, Wei-Lung, and 李威龍. "From Continuum Fluid to Rarefied Gas Dynamics Analysis of Blunt Bodies at Hypersonic Flights." Thesis, 1994. http://ndltd.ncl.edu.tw/handle/44199177276599216406.

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碩士<br>國立中央大學<br>機械工程研究所<br>82<br>Currently there is a renewed interest in the aerothermodynamics of external flows about vehicles at very high altitudes. The main factors are the development of the space transportation system and the orbital transfer vehicles. It is the purpose of this paper to conduct numerical experiments for the hypersonic flow around two diifferent shaped blunt bodies, rectangular shaped and rounded shaped blunt bodies. The general flowfield in

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30

Zhang, Ju. "Simulation of gas dynamics, radiation and particulates in volcanic plumes on Io." Thesis, 2004. http://hdl.handle.net/2152/2103.

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31

Taheri, Bonab Peyman. "Macroscopic description of rarefied gas flows in the transition regime." Thesis, 2010. http://hdl.handle.net/1828/3018.

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The fast-paced growth in microelectromechanical systems (MEMS), microfluidic fabrication, porous media applications, biomedical assemblies, space propulsion, and vacuum technology demands accurate and practical transport equations for rarefied gas flows. It is well-known that in rarefied situations, due to strong deviations from the continuum regime, traditional fluid models such as Navier-Stokes-Fourier (NSF) fail. The shortcoming of continuum models is rooted in nonequilibrium behavior of gas particles in miniaturized and/or low-pressure devices, where the Knudsen number (Kn) is sufficiently

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32

Beckmann, Alexander Felix. "Modeling evaporation in the rarefied gas regime by using macroscopic transport equations." Thesis, 2018. https://dspace.library.uvic.ca//handle/1828/9238.

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Due to failure of the continuum hypothesis for higher Knudsen numbers, rarefied gases and microflows of gases are particularly difficult to model. Macroscopic transport equations compete with particle methods, such as the direct simulation Monte Carlo method (DSMC) to find accurate solutions in the rarefied gas regime. Due to growing interest in micro flow applications, such as micro fuel cells, it is important to model and understand evaporation in this flow regime. To gain a better understanding of evaporation physics, a non-steady simulation for slow evaporation in a microscopic system, bas

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33

Das, Shankhadeep. "Fluid-structure interactions in microstructures." 2013. http://hdl.handle.net/2152/21611.

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Radio-frequency microelectromechanical systems (RF MEMS) are widely used for contact actuators and capacitive switches. These devices typically consist of a metallic membrane which is activated by a time-periodic electrostatic force and makes periodic contact with a contact pad. The increase in switch capacitance at contact causes the RF signal to be deflected and the switch thus closes. Membrane motion is damped by the surrounding gas, typically air or nitrogen. As the switch opens and closes, the flow transitions between the continuum and rarefied regimes. Furthermore, creep is a critical ph

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34

Benkreira, Hadj, and J. Bruce Ikin. "Slot Coating Minimum Film Thickness in Air and in Rarefied Helium." 2016. http://hdl.handle.net/10454/8260.

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Yes<br>This study assesses experimentally the role of gas viscosity in controlling the minimum film thickness in slot coating in both the slot over roll and tensioned web modes. The minimum film thickness here is defined with respect to the onset of air entrainment rather than rivulets, the reason being that rivulets are an extreme form of instabilities occurring at much higher speeds. The gas viscosity effects are simulated experimentally by encasing the coaters in a sealed gas chamber in which various gases can be admitted. An appropriate choice of two gases was used to compare performances

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35

Molda, Vojtěch. "Simulace proudění multiclonou pomocí Boltzmannovy kinetické rovnice." Master's thesis, 2011. http://www.nusl.cz/ntk/nusl-313950.

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An attempt to numerically predict flow rate of experimental configuration of orifices in transition between molecular and viscous flow regime is described in detail. Discretization of Boltzmann kinetic equation known as lattice-Boltzmann method is derived and applied unfortunately with very little connection to the original experimental problem due to nearly supersonic nature of the experimental setup. Current quite unsatisfactory state of the art of compressible lattice-Boltzmann method is also presented.

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