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Relevant bibliographies by topics / Average Flow Model / Dissertations / Theses

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Dissertations / Theses on the topic 'Average Flow Model'

Author: Grafiati

Published: 4 June 2021

Last updated: 1 February 2022

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1

Vyas, Prerit. "Effects of Stochastic (Random) Surface Roughness on Hydrodynamic Lubrication of Deterministic Asperity." UKnowledge, 2005. http://uknowledge.uky.edu/gradschool_theses/344.

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In order to achieve enhanced and cost-effective performance of engineering components, Surface Engineering embraces traditional and innovative surface technologies which modify the surface properties of metallic and non-metallic engineering components for specific and sometime unique engineering purposes. The surface roughness of an engineered surface may be classified as: the random surface roughness which is a product of surface finishing and the deterministic surface roughness which is engineered to increase the lubrication characteristics of the hydro dynamically lubricated thrust ring. Th

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2

Gianfelici, Alessandro. "A linear O(N) model: a functional renormalization group approach for flat and curved space." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8343/.

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In questa tesi sono state applicate le tecniche del gruppo di rinormalizzazione funzionale allo studio della teoria quantistica di campo scalare con simmetria O(N) sia in uno spaziotempo piatto (Euclideo) che nel caso di accoppiamento ad un campo gravitazionale nel paradigma dell'asymptotic safety. Nel primo capitolo vengono esposti in breve alcuni concetti basilari della teoria dei campi in uno spazio euclideo a dimensione arbitraria. Nel secondo capitolo si discute estensivamente il metodo di rinormalizzazione funzionale ideato da Wetterich e si fornisce un primo semplice esempio di applic

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3

Wu, Fei. "Electric Vehicle Charging Network Design and Control Strategies." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1479900508609434.

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4

Khossousi, A. A. "A theoretical investigation of an averaged-structure eddy viscosity model applied to turbulent shear flows." Thesis, London Metropolitan University, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378944.

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5

Li, Ji. "A double layer-averaged model for stratified sediment-laden flow in open channels." Thesis, Heriot-Watt University, 2016. http://hdl.handle.net/10399/3205.

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Sediment-laden flows in open channels can be sharply stratified vertically, characterized by a double-layer flow structure composed of a subaqueous sediment-laden flow layer immediately over the bed and an upper clear-water flow layer. Typical examples include dam-break flows and reservoir sediment-laden flows featuring turbidity currents. In general, sharply stratified sediment-laden flows involve a number of physical factors, including sharp flow stratification, inter-layer exchange, active sediment transport, and substantial mass exchange with the bed. Double layer-averaged models are attra

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6

Guillou, Florian. "CFD Study of the Flow around a High-Speed Train." Thesis, KTH, Aerodynamik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-102033.

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This document is a report summering the master thesis work dealing with the Computational Fluid Dynamic (CFD) study of the flow around a high-speed train. The model is a scaled 1:50 generic train with two cars, one inter-car gap and simplified bogies. A platform is set on the side of the train since one of the aim of the study is to look at the consequences of the phenomena in the wake on people or objects standing on the platform. The slipstream is one of this phenomena, it is due to the fact that the viscous air is dragged when the train is passing. If too strong, it can move or destabilize

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7

Kay, E. D. "A depth-averaged model for non-isothermal rimming flow driven at the surface by droplet impact." Thesis, University of Nottingham, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.664268.

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Driven by an application to the combined cooling and lubrication by oil of an aero-engine bearing chamber the research in this thesis studies non-isothermal thin liquid film flow on the inside of a circular cylinder driven at its surface by an air-shear and interfacial flux of liquid droplets. Flow conditions inside the bearing chamber preclude using classical lubrication theory models since these neglect some of the physical effects, specifically inertia and heat convection, which are important to this problem. To this end a depth-averaged approach, based on hydraulics modelling within a lubr

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8

Yorke, Christopher Philip. "Direct numerical simulation of a strained and recovered channel flow with Reynolds-averaged Navier-Stokes model comparisons." Thesis, University of Southampton, 2005. https://eprints.soton.ac.uk/47118/.

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9

Yoon, Hyunse. "Phase-averaged stereo-PIV flow field and force/moment/motion measurements for surface combatant in PMM maneuvers." Diss., University of Iowa, 2009. https://ir.uiowa.edu/etd/453.

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Towing-tank experiments are performed for a surface combatant as it undergoes static and dynamic planar motion mechanism maneuvers in calm water. The data includes global forces/moment/motions and phase-averaged local flow-fields, and uncertainty assessment. The geometry is DTMB model 5512, which is a 1/46.6 scale geosym of DTMB model 5415, with L = 3.048 m. The experiments are performed in a 3.048 × 3.048 × 100 m towing tank. The measurement system features a custom designed planar motion mechanism, a towed stereoscopic particle image velocimetry system, a Krypton contactless motion tracker,

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10

Li, Zhiyong. "Data-Driven Adaptive Reynolds-Averaged Navier-Stokes k - ω Models for Turbulent Flow-Field Simulations". UKnowledge, 2017. http://uknowledge.uky.edu/me_etds/93.

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The data-driven adaptive algorithms are explored as a means of increasing the accuracy of Reynolds-averaged turbulence models. This dissertation presents two new data-driven adaptive computational models for simulating turbulent flow, where partial-but-incomplete measurement data is available. These models automatically adjust (i.e., adapts) the closure coefficients of the Reynolds-averaged Navier-Stokes (RANS) k-ω turbulence equations to improve agreement between the simulated flow and a set of prescribed measurement data. The first approach is the data-driven adaptive RANS k-ω (D-DARK) model

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11

Leitner, Dominik. "Návrh ocenění podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2013. http://www.nusl.cz/ntk/nusl-223984.

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The subject of this diploma thesis is valuation of the production company XY, s.r.o. by using income- based valuation methods. In the first part of this thesis is a strategic analysis, financial analysis and SWOT analysis. In conclusion are used income- based methods and determine the value of the company at 31.12.2011.

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Hromek, Jan. "Stanovení hodnoty podniku." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2017. http://www.nusl.cz/ntk/nusl-319168.

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This diploma thesis deals with assesing the value of a specific company and with theoretical aspects of such valuation. A construction company called MORAVOSTAV Brno, a. s. stavební společnost was chosen for the assessment. Based on the theoretical findings a strategic and financial analysis was conducted and the value of the company was established by valuation methods of discounted cash flow and economic value added.

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13

Duran, Arnaud. "Numerical simulation of depth-averaged flows models : a class of Finite Volume and discontinuous Galerkin approaches." Thesis, Montpellier 2, 2014. http://www.theses.fr/2014MON20066/document.

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Ce travail est consacré au développement de schémas numériques pour approcher les solutions de modèles d'écoulement type “depth averaged”. Dans un premier temps, nous détaillons la construction d'approches Volumes Finis pour le système Shallow Water avec termes sources sur maillages non structurés. En se basant sur une reformulation appropriée des équations, nous mettons en place un schéma équilibré et préservant la positivité de la hauteur d'eau, et suggérons des extensions MUSCL adaptées. La méthode est capable de gérer des topographies irrégulières et exhibe de fortes propriétés de stabilit

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14

Bond, Ryan Bomar. "Reynolds-Averaged Navier-Stokes Analysis of the Flow through a Model Rocket-Based Combined Cycle Engine with an Independently-Fueled Ramjet Stream." NCSU, 2003. http://www.lib.ncsu.edu/theses/available/etd-08132003-171258/.

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A new concept for the low speed propulsion mode in rocket based combined cycle (RBCC) engines has been developed as part of the NASA GTX program. This concept, called the independent ramjet stream (IRS) cycle, is a variation of the traditional ejector ramjet (ER) design and involves the injection of hydrogen fuel directly into the air stream, where it is ignited by the rocket plume. Experiments and computational fluid dynamics (CFD) are currently being used to evaluate the feasibility of the new design. In this work, a Navier-Stokes code valid for general reactive flows is applied to the model

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15

Mateo, Villanueva Pedro Abdiel. "Toward the Validation of Depth-Averaged, Steady-State Simulations of Fluvial Flows Using Three-Dimensional, Steady-State, RANS Turbulence Models." DigitalCommons@USU, 2010. https://digitalcommons.usu.edu/etd/826.

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Calculations of fluvial flows are strongly influenced by geometry complexity and large overall uncertainty on every single measurable property, such as velocity and shear. Moreover, a considerable portion of the data obtained from computational simulations arose from two-dimensional, steady-state models. The present work states a different approach to perform computer-based simulations and analyze fluvial flows. For the first part, the suitability of OpenFOAM to be used as the main CFD solver to analyze fluvial flows is studied. Initially, two well documented channel configurations are computa

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Pittard, Matthew Thurlow. "Large Eddy Simulation Based Turbulent Flow-induced Vibration of Fully Developed Pipe Flow." Diss., CLICK HERE for online access, 2003. http://contentdm.lib.byu.edu/ETD/image/etd295.pdf.

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17

Jackson, Tim, Peter Victor, and Syed Ali Asjad Naqvi. "Towards a Stock-Flow Consistent Ecological Macroeconomics. Work Package 205, MS40 "Report on model results including additional policies to counter averse effects"." European Commission, bmwfw, 2016. http://epub.wu.ac.at/5012/1/WWWforEurope_WPS_no114_MS40.pdf.

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Modern western economies (in the Eurozone and elsewhere) face a number of challenges over the coming decades. Achieving full employment, meeting climate change and other key environmental targets, and reducing inequality rank amongst the highest of these. The conventional route to achieving these goals has been to pursue economic growth. But this route has created two critical problems for modern economies. The first is that higher growth leads (ceteris parabis) to higher environmental impact. The second is that fragility in financial balances has accompanied relentless demand expansion. The

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18

Srinivasa, Murthy P. "Low Reynolds Number Airfoil Aerodynamics." Thesis, Indian Institute of Science, 2000. http://hdl.handle.net/2005/229.

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In this thesis we describe the development of Reynolds- averaged Navier Stokes code for the flow past two- dimensional configuration. Particularly, emphasis has been laid on the study of low Reynolds number airfoil aerodynamics. The thesis consists of five chapters covering the back ground history, problem formulation, method of solution and discussion of the results and conclusion. Chapter I deals with a detailed background history of low Reynolds number aerodynamics, problem associated with it, state of the art, its importance in practical applications in aircraft industries. Chapter II d

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19

Kashyap, Shalini. "A 3-D Numerical Study of Flow, Coherent Structures and Mechanisms Leading to Scour in a High Curvature 135° Channel Bend with and Without Submerged Groynes." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23323.

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This thesis focused on investigating flow, coherent structures, and mechanisms leading to scour around a series of three submerged groynes in a high curvature (radius of curvature (R)/channel width (B)=1.5) channel bend using a Large Eddy Simulation Numerical (LES) model. Flow was investigated during both an initial and a later stage of scour. The results showed that the groynes appeared effective in keeping the main core of high streamwise velocity away from the outer bank wall in the region where they were installed, although high potential still existed for local scour around the groynes.

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20

Aïssiouene, Nora. "Numerical analysis and discrete approximation of a dispersive shallow water model." Thesis, Paris 6, 2016. http://www.theses.fr/2016PA066494/document.

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Dans cette thèse, on s’intéresse à l’approximation numérique d’un modèle d’écoulement dispersif en eau peu profonde. Les applications visées par ce type de modélisation sont nombreuses (écoulement dans les océans, les rivières, etc) et cette thèse est motivée en particulier par les risques naturels et la production d’énergie renouvelable. Le modèle étudié a été dérivé par moyenne selon la verticale des équations d’Euler et prend en compte la pression non-hydrostatique. Il est alors nécessaire de résoudre un système de type incompressible; ce qui nous amène à résoudre une équation elliptique en

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21

Boufet, Leonita dos Santos. "Modelos de valorização de empresas : estudo de caso em empresa supermercadista." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/8408.

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Nos últimos anos, com a aceleração da globalização, tem-se intensificado a atividade de análise e avaliação de investimentos. Dentre as diversas técnicas de mensuração de valor e risco, mereceu especial destaque as ferramentas de avaliação de empresas, em razão da significativa profusão de negociações de e entre empresas, que inclui grande número de fusões aquisições e parcerias. Em diferentes segmentos empresas privadas de capital fechado, passam a ser alvo de grandes companhias ou vislumbram vir a ser, o que traz a necessidade ao empresariado de saber qual o valor do seu negócio, qual o valo

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22

Belmar, Gil Mario. "Computational study on the non-reacting flow in Lean Direct Injection gas turbine combustors through Eulerian-Lagrangian Large-Eddy Simulations." Doctoral thesis, Universitat Politècnica de València, 2021. http://hdl.handle.net/10251/159882.

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[ES] El principal desafío en los motores turbina de gas empleados en aviación reside en aumentar la eficiencia del ciclo termodinámico manteniendo las emisiones contaminantes por debajo de las rigurosas restricciones. Ésto ha conllevado la necesidad de diseñar nuevas estrategias de inyección/combustión que operan en puntos de operación peligrosos por su cercanía al límite inferior de apagado de llama. En este contexto, el concepto Lean Direct Injection (LDI) ha emergido como una tecnología prometedora a la hora de reducir los óxidos de nitrógeno (NOx) emitidos por las plantas propulsoras de lo

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23

Robertson, Francis. "An experimental investigation of the drag on idealised rigid, emergent vegetation and other obstacles in turbulent free-surface flows." Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/an-experimental-investigation-of-the-drag-on-idealised-rigid-emergent-vegetation-and-other-obstacles-in-turbulent-freesurface-flows(07165357-67da-461d-a6a2-ed4970e2cb0c).html.

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Vegetation is commonly modelled as emergent arrays of rigid, circular cylinders. However, the drag coefficient (CD) of real stems or trunks is closer to that of cylinders with a square cross-section. In this thesis, vegetation has been idealised as square cylinders in laboratory experiments with a turbulence intensity of the order of 10% which is similar to that of typical river flows. These cylinders may also represent other obstacles such as architectural structures. This research has determined CD of an isolated cylinder and cylinder pairs as a function of position as well as the average dr

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24

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

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

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25

Jeong, Eun-Hwan. "Selected problems in turbulence theory and modeling." Diss., Texas A&M University, 2003. http://hdl.handle.net/1969.1/523.

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Three different topics of turbulence research that cover modeling, theory and model computation categories are selected and studied in depth. In the first topic, "velocity gradient dynamics in turbulence" (modeling), the Lagrangian linear diffusion model that accounts for the viscous-effect is proposed to make the existing restricted-Euler velocity gradient dynamics model quantitatively useful. Results show good agreement with DNS data. In the second topic, "pressure-strain correlation in homogeneous anisotropic turbulence subject to rapid strain-dominated distortion" (theory), extensive rapid

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26

Lima, Leon Matos Ribeiro de. "Desenvolvimento de modelos 2D para simulação de escoamentos ambientais." Universidade do Estado do Rio de Janeiro, 2010. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=7695.

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27

Mesquita, Filipa Geraldes Marques. "Equity research - Novabase." Master's thesis, Instituto Superior de Economia e Gestão, 2014. http://hdl.handle.net/10400.5/6541.

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Mestrado em Contabilidade, Fiscalidade e Finanças Empresariais<br>A elaboração deste equity research tem essencialmente três propósitos. Em primeiro, estudar a complexidade da temática sobre avaliação de empresas que nos últimos anos tem ganho relevo, devido essencialmente às incertezas sobre a sustentabilidade económico-financeira mundial que se reflete no desempenho das empresas e consequentemente no seu valor. Em segundo, avaliar o maior grupo português em Tecnologias de Informação – a Novabase, devido à sua dimensão e destaque que tem tido nos últimos anos. Por último, tecer uma recomendaç

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28

Shin, Hyun Ho. "Uma Metodologia de Estudo de Simulação Tridimensional de Escoamento Turbulento Estratificado no Reservatório de Plantas Hidrelétricas." Universidade do Estado do Rio de Janeiro, 2009. http://www.bdtd.uerj.br/tde_busca/arquivo.php?codArquivo=8586.

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>Uma simulação numérica que leva em conta os efeitos de estratificação e mistura escalar (como a temperatura, salinidade ou substância solúvel em água) é necessária para estudar e prever os impactos ambientais que um reservatório de usina hidrelétrica pode produzir. Este trabalho sugere uma metodologia para o estudo de escoamentos ambientais, principalmente aqueles em que o conhecimento da interação entre a estratificação e mistura pode dar noções importantes dos fenômenos que ocorrem. Por esta razão, ferramentas de simulação numéri

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Ferreira, Valdemir Garcia. "Análise e implementação de esquemas de convecção e modelos de turbulência para simulação de escoamentos incompressíveis envolvendo superfícies livres." Universidade de São Paulo, 2001. http://www.teses.usp.br/teses/disponiveis/55/55134/tde-14112001-083026/.

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Uma parte significativa dos escoamentos encontrados em aplicações tecnológicas é caracterizada por envolver altos números de Reynolds, principalmente aqueles em regime turbulento e com superfície livre. Obter soluções numéricas representativas para essa classe de problemas é extremamente difícil, devido à natureza não-linear das equações diferenciais parciais envolvidas nos modelos. Conseqüentemente, o tema tem sido uma das principais preocupações da comunidade científica moderna em dinâmica de fluidos computacional. Aproximações de primeira ordem para os termos convectivos são as mais ade

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30

Page, Daniel. "Reviving Beta? Another look at the cross-section of average share returns on the JSE." Thesis, 2012. http://hdl.handle.net/10539/11613.

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Van Rensburg and Robertson (2003a) stated that the CAPM beta has little or no relationship with returns generated by size and price to earnings sorted portfolios. This study intends to demonstrate that a reformulated CAPM beta, estimated using return on equity as opposed to share returns, unravels the size and value premium. The study proves that the “cash-flow” generated beta partially explains the cross-sectional variation in share returns when measured over the long run, specifically when portfolios are sorted on book to market, however the cash flow beta is less successful when attem

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31

Tu, Zong-Ming, and 塗宗明. "Study on Dry-Bed Treatment for Depth-Averaged 2D Implicit Water Flow Model." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/r3s9ng.

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碩士<br>國立交通大學<br>土木工程系所<br>95<br>The purpose of this study is to modify the dry-bed treatment for RESED2D flow model(Hsien,2003), including the justifying technique for internal solid-boundary and the setting for lateral inflow/outflow boundary. Four cases, including dam-break flow, bend flow along compound channel, bridge piers, and diversion flow, have been studied to demonstrate the accuracy and practical applicability of the proposed model.

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Shan, Y., S. Huang, C. Liu, Yakun Guo, and K. Yang. "Prediction of the depth-averaged two-dimensional flow direction along a meander in compound channels." 2018. http://hdl.handle.net/10454/16549.

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Yes<br>For overbank flows in meandering channels, the flow direction along a meander varies and is affected by floodplain vegetation. This study proposes a model for predicting the depth-averaged two-dimensional flow direction (depth-averaged flow angle) along a meander in smooth and vegetated meandering compound channels. Laboratory experiments were performed in smooth and vegetated channels. Measurements show that the height of the secondary current cell in the main channel is increased by dense floodplain vegetation comparing with that in a non-vegetated channel. A method of determining the

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WU, TANG-HONG, and 巫唐宏. "A depth-averaged two dimensional numerical model for open channel flow of a right angle side influx." Thesis, 1990. http://ndltd.ncl.edu.tw/handle/60446126037657114385.

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Pu, Jaan H. "Turbulent Rectangular Compound Open Channel Flow Study Using Multi-Zonal Approach." 2018. http://hdl.handle.net/10454/16744.

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Yes<br>In this paper, an improved Shiono-Knight model (SKM) has been proposed to calculate the rectangular compound open channel flows by considering a Multi-Zonal (MZ) approach in modelling turbulence and secondary flows across lateral flow direction. This is an effort to represent natural flows with compound shape more closely. The proposed model improves the estimation of secondary flow by original SKM model to increase the accuracy of depthaveraged velocity profile solution formed within the transitional region between different sections (i.e. between main-channel and floodplain) of

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35

Lakshmipathy, Sunil. "PARTIALLY AVERAGED NAVIER-STOKES METHOD FOR TURBULENCE CLOSURES: CHARACTERIZATION OF FLUCTUATIONS AND EXTENSION TO WALL BOUNDED FLOWS." 2009. http://hdl.handle.net/1969.1/ETD-TAMU-2009-05-722.

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The work presented in this dissertation concerns continued development, validation and verification of the partially averaged Navier-Stokes (PANS) method - a variable resolution closure model for turbulence. Linear eddy viscosity models (LEVM), which are popular because of their simplicity and affordability in terms of computational cost have fundamental deficiencies and cannot be trusted to accurately represent turbulence in realistic complex flows. The more high fidelity approaches such as large eddy simulations (LES) and direct numerical simulations (DNS) are out of realm of engineering app

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Allamaprabhu, Yaravintelimath. "Turbulence Modeling for Predicting Flow Separation in Rocket Nozzles." Thesis, 2014. http://hdl.handle.net/2005/3046.

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Convergent-Divergent (C-D) nozzles are used in rocket engines to produce thrust as a reaction to the acceleration of hot combustion chamber gases in the opposite direction. To maximize the engine performance at high altitudes, large area ratio, bell-shaped or contoured nozzles are used. At lower altitudes, the exit pressure of these nozzles is lower than the ambient pressure. During this over-expanded condition, the nozzle-internal flow adapts to the ambient pressure through an oblique shock. But the boundary layer inside the divergent portion of the nozzle is unable to withstand the pressure

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AnaRizkasari and 倪子綺. "An application of a depth-averaged model in terrain-fitted coordinate system for pyroclastic flows: a case study of Merapi Volcano eruption, 2010, Indonesia." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/c39tmd.

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碩士<br>國立成功大學<br>自然災害減災及管理國際碩士學位學程<br>105<br>In this thesis, a depth-averaged model in a terrain-fitted coordinate system is applied to simulate the pyroclastic flows during the eruption of Mt. Merapi in 2010. Through the numerical simulation we are able to obtain more precise flow information, such as the local flow fluxes, the distributions of flow depth and velocity as well as the deposits, for the goal of hazard mitigation or hazard management. In the numerical computation, the terrain-fitted coordinate system is based on the digital elevation model (DEM). Because of the fact that the real

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Ye, Isaac Keeheon. "Investigation of the scalar variance and scalar dissipation rate in URANS and LES." Thesis, 2011. http://hdl.handle.net/10012/5801.

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Large-eddy simulation (LES) and unsteady Reynolds-averaged Navier-Stokes (URANS) calculations have been performed to investigate the effects of different mathematical models for scalar variance and its dissipation rate as applied to both a non-reacting bluff-body turbulent flow and an extension to a reacting case. In the conserved scalar formalism, the mean value of a thermo-chemical variable is obtained through the PDF-weighted integration of the local description over the conserved scalar, the mixture fraction. The scalar variance, one of the key parameters for the determination of a presume

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