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Дисертації з теми "Unsteady mode"

Автор: Grafiati

Опубліковано: 2 грудня 2022

Оновлено: 25 липня 2025

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1

McCombes, Tom Ruaridh. "An unsteady hydrodynamic model for tidal current turbines." Thesis, University of Strathclyde, 2014. http://oleg.lib.strath.ac.uk:80/R/?func=dbin-jump-full&object_id=25495.

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Due to concerns about the impacts of carbon emissions on the environment, the security of supply of electricity and the likelihood of achieving "peak-oil" in the near future, governments have legislated to reduce reliance on fossil fuels. An attractive alternative is power obtained from tidal currents, and the coast of the British Isles is especially hydraulically active. Tidal energy converters typically resemble wind turbines however, unlike wind turbines, they are expected to operate in an environment which is singularly hostile, and will also be expected to generate power in non-ideal oper

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2

Strganac, Thomas W. "A numerical model of unsteady, subsonic aeroelastic behavior." Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/74775.

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A method for predicting unsteady, subsonic aeroelastic responses has been developed. The technique accounts for aerodynamic nonlinearities associated with angles of attack, vortex-dominated flow, static deformations, and unsteady behavior. The angle of attack is limited only by the occurrence of stall or vortex bursting near the wing. The fluid and the wing together are treated as a single dynamical system, and the equations of motion for the structure and flowfield are integrated simultaneously and interactively in the time domain. The method employs an iterative scheme based on a predictor-c

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3

Janowski, Michael David. "Analysis of a simplified nonlinear ground resonance model." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/16084.

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4

Kitsios, Vassili. "Recovery of fluid mechanical modes in unsteady separated flows." Poitiers, 2010. http://www.theses.fr/2010POIT2292.

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This study is concerned with the recovery of fluid mechanical modes that can be used to describe the physical properties of unsteady separated flows. The flow configuration of interest is a spanwise homogeneous NACA 0015 airfoil with leading edge laminar separation and turbulent recirculation. An in-depth understanding of the unsteady flow dynamics and fluid mechanical stability properties, can assist in the future development of more efficient separation control strategies. In order to provide a richer understanding of the physics, the flow fields are numerically generated, and characterised

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5

Boyd, David Douglas Jr. "Rotor/Fuselage Unsteady Interactional Aerodynamics: A New Computational Model." Diss., Virginia Tech, 1999. http://hdl.handle.net/10919/28591.

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A new unsteady rotor/fuselage interactional aerodynamics model has been developed. This model loosely couples a Generalized Dynamic Wake Theory (GDWT) to a Navier-Stokes solution procedure. This coupling is achieved using a newly developed unsteady pressure jump boundary condition in the Navier-Stokes model. The new unsteady pressure jump boundary condition models each rotor blade as a moving pressure jump which travels around the rotor azimuth =and is applied between two adjacent planes in a cylindrical, non-rotating grid. Comparisons are made between predictions using this new model and ex

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6

Chua, Weng Heng. "Flow visualization studies over a UCAV 1303 model." Thesis, Monterey, Calif. : Naval Postgraduate School, 2009. http://edocs.nps.edu/npspubs/scholarly/theses/2009/Jun/09Jun%5FChua.pdf.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, June 2009.<br>Thesis Advisor(s): Chandrasekhara, M. S. "June 2009." Description based on title screen as viewed on July 10, 2009. Author(s) subject terms: Unsteady Aerodynamics, UCAV Maneuvers, 2D-unsteady flows. Includes bibliographical references (p. 43-44). Also available in print.

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7

Ghimire, Ganesh Raj. "Developing Sediment Transport and Deposition Prediction Model of Lower Ohio River near the Olmsted Locks and Dam Area." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/1967.

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The present study focuses on the sediment deposition and consequent dredging issues in Lower Ohio River at the Olmsted Locks and Dam area-River mile (RM)-964.4 during the ongoing in-the-wet construction methodology. The study reach is between Locks and Dam 53 (RM 962.6) at upstream, and RM 970 at downstream. One dimensional (1-D) HEC-RAS numerical modeling in conjunction with Arc-GIS was employed. Stream flow measurements, velocity, incoming sediment concentration, bed gradation, and annual hydrographic survey data acquired from public archives of USGS and USACE Louisville District were used a

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8

Ghommem, Mehdi. "Modeling and Analysis for Optimization of Unsteady Aeroelastic Systems." Diss., Virginia Tech, 2011. http://hdl.handle.net/10919/29604.

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Анотація:

Simulating the complex physics and dynamics associated with unsteady aeroelastic systems is often attempted with high-fidelity numerical models. While these high-fidelity approaches are powerful in terms of capturing the main physical features, they may not discern the role of underlying phenomena that are interrelated in a complex manner. This often makes it difficult to characterize the relevant causal mechanisms of the observed features. Besides, the extensive computational resources and time associated with the use these tools could limit the capability of assessing different configuratio

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9

Romano, Federico. "Q1D unsteady ballistic model for solid rocket motors performance prediction." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The simulation tool ROBOOST, in use at the Alma Propulsion Lab of the University of Bologna – Forlì Campus, exploits a hybrid ballistic model 0D-1D. The need of a complete Q1D model for the entire combustion time, from motor start-up to burn out arised. The present work is devoted to the development and test of a Q1D unsteady ballistic model for solid rocket motors performance prediction. The newly developed code, called SOL1D, is written in Matlab environment and is capable of predicting the time and space evolution of all the main thermodynamic variables during the solid rocket motor combust

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10

Hosder, Serhat. "Unsteady Skin-Friction Measurements on a Maneuvering Darpa2 Suboff Model." Thesis, Virginia Tech, 2001. http://hdl.handle.net/10919/33582.

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Steady and unsteady flow over a generic Suboff submarine model is studied. The skin-friction magnitudes are measured by using hot-film sensors each connected to a constant temperature anemometer. The local minima in the skin-friction magnitudes are used to obtain the separation locations. Steady static pressure measurements on the model surface are performed at 10Â° and 20Â° angles of attack. Steady and unsteady results are presented for two model configurations: barebody and sail-on-side case. The dynamic plunge-pitch-roll model mount (DyPPiR) is used to simulate the pitchup maneuvers. The p

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11

Duong, Hien Duc Carleton University Dissertation Engineering Aeronautical. "Measurements of unsteady propeller noise induced on a model fuselage." Ottawa, 1989.

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12

Wang, Jinghua. "A hybrid model for large scale simulation of unsteady nonlinear waves." Thesis, City University London, 2016. http://openaccess.city.ac.uk/14575/.

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A hybrid model for simulating rogue waves in random seas on a large time and space scale is proposed in this thesis. It is formed by combining the derived fifth order Enhanced Nonlinear Schrödinger Equation based on Fourier transform (ENLSE-5F), the fully nonlinear Enhanced Spectral Boundary Integral (ESBI) method and its simplified version. The numerical techniques and algorithm for coupling three models on time scale are provided. Using them, and the switch between the three models during the computation is triggered automatically according to wave nonlinearities. Numerical tests are carried

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13

Davis, Mallory. "Numerical Simulation of Unsteady Hydrodynamics in the Lower Mississippi River." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1126.

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Alterations along the Mississippi River, such as dams and levees, have greatly reduced the amount of freshwater and sediment that reaches the Louisiana coastal area. Several freshwater and sediment diversions have been proposed to combat the associated land loss problem. To aid in this restoration effort a 1-D numerical model was calibrated, validated, and used to predict the response of the river to certain stimuli, such as proposed diversions, channel closures, channel modifications, and relative sea level rise. This study utilized HEC-RAS 4.0, a 1-D mobile-bed numerical model, which was cal

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14

Fahs, Amin. "Modeling of naturel convection in porous media : development of semi-analytical and spectral numerical solutions of heat transfer problem in special domains." Thesis, Strasbourg, 2021. https://publication-theses.unistra.fr/restreint/theses_doctorat/2021/Fahs_Amin_2021_ED269.pdf.

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Le problème de la cavité poreuse carrée est largement utilisé comme cas de référence courant pour les problèmes de Convection Naturelle (CN) en milieux poreux. Il peut être utilisé pour plusieurs applications numériques, théoriques et pratiques. Par ailleurs, toutes les solutions de haute précision existantes dans la littérature scientifique sont développées dans des conditions de régime permanent. Cependant, il est bien connu que les processus de CN dans les milieux poreux se produisent naturellement dans un régime dépendant du temps, car les conditions aux limites peuvent être variables dans

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15

Kaladi, Vasudevan M. "Unsteady compressible lifting surface analysis for rotary wings using velocity potential modes." Diss., Georgia Institute of Technology, 1990. http://hdl.handle.net/1853/12524.

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16

Sheldrake, C. D. "Unsteady effects in the high pressure stage of a model gas turbine." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.242794.

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17

Camacho, Luis Alejandro. "Development of a hierarchical modelling framework for solute transport under unsteady flow conditions in rivers." Thesis, Imperial College London, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369124.

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18

Chen, Xuewen. "A Nonlinear Viscoelastic Mooney-Rivlin Thin Wall Model for Unsteady Flow in Stenosis Arteries." Digital WPI, 2003. https://digitalcommons.wpi.edu/etd-theses/229.

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Severe stenosis may cause critical flow conditions related to artery collapse, plaque cap rupture which leads directly to stroke and heart attack. In this paper, a nonlinear viscoelastic model and a numerical method are introduced to study dynamic behaviors of the tube wall and viscous flow through a viscoelastic tube with a stenosis simulating blood flow in human carotid arteries. The Mooney-Rivlin material model is used to derive a nonlinear viscoelastic thin-wall model for the stenotic viscoelastic tube wall. The mechanical parameters in the Mooney-Rivlin model are calculated from experime

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19

McNabb, Michael Lynn. "Development of a cycloidal propulsion computer model and comparison with experiment." Master's thesis, Mississippi State : Mississippi State University, 2001. http://library.msstate.edu/etd/show.asp?etd=etd-08032001-111940.

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20

Martin, Christopher Reed. "Reduced-Order Models for the Prediction of Unsteady Heat Release in Acoustically Forced Combustion." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/30238.

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This work presents novel formulations for models describing acoustically forced combustion in three disjoint regimes; highly turbulent, laminar, and the moderately turbulent flamelet regime. Particular emphasis is placed on simplification of the models to facilitate analytical solutions while still reflecting real phenomenology. Each derivation is treated by beginning with general reacting flow equations, identifying a small subset of physics thought to be dominant in the corresponding regime, and making appropriate simplifications. Each model is non-dimensionalized and both naturally occur

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21

Hosseini, Seyed Mahmood. "Development of an unsteady non-linear model for flow through coarse porous media." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/NQ27456.pdf.

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22

Pfeiffer, Jens [Verfasser]. "Unsteady Analytical Model for Appendix Gap Losses in Stirling Cycle Machines / Jens Pfeiffer." München : Verlag Dr. Hut, 2016. http://d-nb.info/109781811X/34.

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23

Hytopoulos, Evangelos. "A turbulence model for steady and unsteady boundary layers in strong pressure gradients." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/40119.

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A new turbulence model designed for two-dimensional, steady and unsteady boundary layers in strong adverse pressure gradients is described. The model is developed in a rational way based on an understanding of the flow physics obtained from recent experimental observations. The turbulent shear stress is given by a mixing length model, but the variation of the mixing length in the outer region is not constant; it varies according to an integral form of the turbulence kinetic-energy equation. This approach allows for the history effects of the turbulence to be taken into account in an approximat

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24

Fan, Yigang. "Identification of an Unsteady Aerodynamic Model up to High Angle of Attack Regime." Diss., Virginia Tech, 1997. http://hdl.handle.net/10919/29830.

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The harmonic oscillatory tests for a fighter aircraft configuration using the Dynamic Plunge-Pitch-Roll (DyPPiR) model mount at Virginia Tech Stability Wind Tunnel are described and analyzed. The corresponding data reduction methods are developed on the basis of multirate digital signal processing techniques. Since the model is sting-mounted to the support system of DyPPiR, the Discrete Fourier Transform (DFT) is first used to identify the frequencies of the elastic modes of sting. Then the sampling rate conversion systems are built up in digital domain to resample the data at a lower rate wit

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25

Yu, Chunshui. "Two Dimensional Finite Volume Model for Simulating Unsteady Turbulent Flow and Sediment Transport." Diss., The University of Arizona, 2013. http://hdl.handle.net/10150/301662.

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The two-dimensional depth-averaged shallow water equations have attracted considerable attentions as a practical way to solve flows with free surface. Compared to three-dimensional Navier-Stokes equations, the shallow water equations give essentially the same results at much lower cost. Solving the shallow water equations by the Godunov-type finite volume method is a newly emerging area. The Godunov-type finite volume method is good at capturing the discontinuous fronts in numerical solutions. This makes the method suitable for solving the system of shallow water equations. In this dissertatio

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26

Beneddine, Samir. "Characterization of unsteady flow behavior by linear stability analysis." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX010/document.

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Au cours des dernières décennies, la théorie de la stabilité a été intensivement utilisée pour caractériser le comportement instationnaire d'écoulements. Cela a donné naissance à un grand nombre d'approches, mais malheureusement chacune d'entre elles semble présenter ses propres limitations. De plus, leurs conditions de validité sont encore très mal connues, ce qui soulève la question de la fiabilité de ce genre de méthodes dans un cas général.Cette problématique est traitée dans cette thèse en s'intéressant dans un premier temps aux approches classiques de stabilité, qui étudient l'évolution

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27

Kratschun, Filipp, Jens Köhne, Peter Kloft, Heiko Baum, and Katharina Schmitz. "One dimensional unsteady model of a hydropneumatic piston accumulator based on finite volume method." Technische Universität Dresden, 2020. https://tud.qucosa.de/id/qucosa%3A71089.

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Hydraulic piston accumulators play a major role especially within the field of stationary hydraulics. The calculation of the amount of hydraulic energy which can be stored in such an accumulator is crucial when it comes to a precise system design. The knowledge of the temperature and pressure within the accumulator is required in order to calculate the amount of energy to be stored. The state of the art solution to estimate the state of change of such an accumulator is the implementation of a costly measurement system within the accumulator which tracks the position of the piston. The goal of

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28

Soler, Blanco Pablo. "Simulation and modelling of the performance of radial turbochargers under unsteady flow." Doctoral thesis, Universitat Politècnica de València, 2020. http://hdl.handle.net/10251/141609.

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[ES] Está fuera de toda duda que la industria del automóvil está viviendo una profunda transformación que, durante los últimos años, ha progresado a un ritmo acelerado. Debido a la crecientemente estricta regulación sobre emisiones contaminantes y la necesidad de satisfacer la siempre creciente demanda de movilidad sostenible, es necesario que los motores de combustión modernos reduzcan su consumo y emisiones manteniendo el rendimiento del motor. Para enfrentarse a este desafío, los ingenieros de investigación y desarrollo han redoblado sus esfuerzos a la hora de diseñar y mejorar los modelos

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29

RICHTER, ANDREAS. "MODELING CHLORINE DECAY IN DEAD ENDS OF WATER DISTRIBUTION SYSTEMS UNDER GENERALIZED INTERMITTENT FLOW CONDITIONS." University of Cincinnati / OhioLINK, 2001. http://rave.ohiolink.edu/etdc/view?acc_num=ucin990544293.

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30

SHAHJAHAN, ALI MD. "MODEL REFINEMENT OF UNSTEADY RANS AND ITS PRACTICAL APPLICATIONS IN THE FIELD OF HYDRAULIC ENGINEERING." 京都大学 (Kyoto University), 2008. http://hdl.handle.net/2433/66197.

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Kyoto University (京都大学)<br>0048<br>新制・課程博士<br>博士(工学)<br>甲第14139号<br>工博第2973号<br>新制||工||1441(附属図書館)<br>26445<br>UT51-2008-N456<br>京都大学大学院工学研究科都市社会工学専攻<br>(主査)教授細田尚, 教授後藤仁志, 准教授牛島省<br>学位規則第4条第1項該当

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31

Mishra, Bikash. "Model development of a polymer electrolyte membrane fuel cell to predict steady and unsteady behavior." Diss., Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-08132008-103611.

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32

Ferria, Hakim. "Experimental Campaign on a Generic Model for Fluid-Structure Interaction Studies." Thesis, KTH, Kraft- och värmeteknologi, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-48975.

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Fluid-structure interactions appear in many industrial applications in the field of energy technology. As the components are more and more pushed to higher performance, taking fluid-structure interaction phenomena into account has a great impact on the design as well as in the cost and safety. Internal flows related to propulsion systems in aerodynamics area are of our interest; and particularly aeroelasticity and flutter phenomena. A new 2D flexible generic model, so called bump, based on previous studies at the division of Heat and Power Technology about fluid-structure interactions is here

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33

McMackin, Martin. "A one-dimensional model of the unsteady gas dynamics and surface relations within an automotive catalyst." Thesis, Queen's University Belfast, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.486531.

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The motivation behind this investigation was the need to further the understanding of the gas dynamic behaviour of automotive catalysts under pulsating flow conditions, with a view to improving the ease and accuracy of simulating engine-catalyst systems. A VIRTUAL 4-STROKE model representative of a current-generation engine-catalyst system was developed and simulated over a range of operating conditions. The capability . of this model to simulate a current-generation engine-catalyst system model was evaluated against measured results obtained during dynamometer experiments. A separate simulati

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34

Dorigatti, Francesco. "Rail vehicles in crosswinds : analysis of steady and unsteady aerodynamic effects through static and moving model tests." Thesis, University of Birmingham, 2013. http://etheses.bham.ac.uk//id/eprint/4267/.

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This thesis presents the results of an experimental investigation of scale-model trains in crosswinds, undertaken to assess steady and unsteady aerodynamic effects of the vehicle movement simulation. A 1:25 scale-model train was tested in the University of Birmingham's TRAIN rig facility. A crosswind generator was designed and constructed to enable static and moving model experiments in the presence of crosswinds in this facility. An on board pressure measuring system comprising a series of miniaturised pressure transducers and a bespoke stand alone data logger were developed. Static and mov

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35

Horna, Munoz Daniel Vicente. "Investigation of floodwave propagation over natural bathymetry using a three-dimensional numerical model." Diss., University of Iowa, 2017. https://ir.uiowa.edu/etd/5948.

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The current standard of simulating flood flow in natural river reaches is based on solving the 1-D or 2-D St. Venant equations or using hybrid 1-D/2-D models based on the same equations. These models are not always able to accurately predict floodwave propagation, especially around and downstream of regions where 3-D effects become important, or at times when the main assumptions associated with these models are violated (e.g. flow becomes pressurized due to presence of a hydraulic structure like a bridge or a culvert). A 3-D modeling approach, though computationally much more expensive, is no

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36

Venâncio, Stênio de Sousa. "Modelo computacional para análise de transiente hidráulico em canais." Universidade de São Paulo, 2003. http://www.teses.usp.br/teses/disponiveis/18/18138/tde-16022009-191816/.

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Este trabalho representa a continuidade de estudos envolvendo a problemática dos escoamentos com superfície livre, contemplando a análise do fenômeno transiente em canais, a partir do modelo matemático unidimensional de Saint-Venant. Para tanto, é desenvolvido um modelo computacional em linguagem FORTRAN, capaz de avaliar o comportamento do escoamento não permanente. As equações hidrodinâmicas completas são discretizadas por um esquema completamente implícito de diferenças finitas e aplicadas no modelo computacional para a avaliação de dois casos. O modelo é previamente testado para um caso si

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37

Ansari, Salman Ahmad. "A nonlinear, unsteady aerodynamic model for insect-like flapping wings in the hover with micro air vehicle applications." Thesis, Cranfield University, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.441548.

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38

Kotsiopoulos, Athanasios. "Development of an unsteady state model for the tank bioleaching of sulphide mineral concentrates in flow reactor systems." Doctoral thesis, University of Cape Town, 2012. http://hdl.handle.net/11427/10849.

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Includes bibliographical references.<br>In this thesis, it is hypothesized that in bioleaching flow reactor systems, high reaction rate regions exist that can be maintained by application of biological stress trajectories. Reactor models are developed for the purpose of optimising plant operation, understood here as maximising the production rate. Complicating this attempt are a) the non-linear dynamics associated with the kinetics and b) the primary reaction's being multiphase. Mathematical models are developed to establish which particle parameters are necessary to describe reactor performan

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39

Vos, Adele. "Unsteady flow conditions at dam bottom outlet works due to air entrainment during gate closure : Berg River dam model." Thesis, Stellenbosch : Stellenbosch University, 2012. http://hdl.handle.net/10019.1/71850.

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Thesis (MSc)--Stellenbosch University, 2012.<br>ENGLISH ABSTRACT: A trial closure of the emergency gate of the Berg River Dam was undertaken by the Trans- Caledon Tunnel Authority (TCTA) on 12 June 2008. The air vent downstream of the emergency gate was designed to introduce air to mitigate the negative pressures that were expected in the conduit during emergency gate operations. The emergency gate has to close when the radial gate at the downstream end of the outlet conduit fails. Contrary to the theoretical design, the measured air vent velocities in the field indicated that, while the

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40

Saunders, Daniel Curtis. "Wind Turbine Wake Interactions - Characterization of Unsteady Blade Forces and the Role of Wake Interactions in Power Variability Control." ScholarWorks @ UVM, 2017. http://scholarworks.uvm.edu/graddis/745.

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Growing concerns about the environmental impact of fossil fuel energy and improvements in both the cost and performance of wind turbine technologies has spurred a sharp expansion in wind energy generation. However, both the increasing size of wind farms and the increased contribution of wind energy to the overall electricity generation market has created new challenges. As wind farms grow in size and power density, the aerodynamic wake interactions that occur between neighboring turbines become increasingly important in characterizing the unsteady turbine loads and power output of the farm. Tu

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41

Soderquist, Daniel Robert. "Analysis of Distortion Transfer and Generation through a Fan and a Compressor Using Full-annulus Unsteady RANS and Harmonic Balance Approaches." BYU ScholarsArchive, 2019. https://scholarsarchive.byu.edu/etd/7401.

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Understanding distortion transfer and generation through fan and compressor blade rows is able to assist in blade design and performance prediction. Using full annulus unsteady RANS simulations, the effects of distortion as it passes through the rotor of a transonic fan at five radial locations (10%, 30%, 50%, 70%, and 90% span) are analyzed. The inlet distortion profile is a 90-degree sector with a 15% total pressure deficit. Fourier distortion descriptors are used in this study to quantitatively describe distortion transfer and generation. Results are presented and compared for three operati

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42

Alahmadi, Eyman Salem M. "1D model for flow in the pulmonary airway system." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/1d-model-for-flow-in-the-pulmonary-airway-system(a44e1ea2-a93e-4ed2-b2b0-bc8aa6edd039).html.

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Voluntary coughs are used as a diagnostic tool to detect lung diseases. Understanding the mechanics of a cough is therefore crucial to accurately interpreting the test results. A cough is characterised by a dynamic compression of the airways, resulting in large flow velocities and producing transient peak expiratory flows. Existing models for pulmonary flow have one or more of the following limitations: 1) they assume quasi-steady flows, 2) they assume low speed flows, 3) they assume a symmetrical branching airway system. The main objective of this thesis is to develop a model for a cough in t

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43

Maduta, Robert [Verfasser], Cameron [Akademischer Betreuer] Tropea, Suad [Akademischer Betreuer] Jakirlić, and Amsini [Akademischer Betreuer] Sadiki. "An eddy-resolving Reynolds stress model for unsteady flow computations: development and application / Robert Maduta. Betreuer: Cameron Tropea ; Suad Jakirlic ; Amsini Sadiki." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2013. http://d-nb.info/1108094279/34.

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44

Gurung, Tshering T. "One-Dimensional Dynamic Modeling of the Lower Mississippi River." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1804.

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The Mississippi River (MR) has been engineered with the development of the levee system, dams for flood control measures, jetties, revetments and dredging of the navigation channel. These alterations have reduced the replenishment of the sediment to the Louisiana Coastal area. To aid in the restoration planning, 1-D numerical models have been calibrated and validated to predict the river response to various changes such as channel modifications, varied flow conditions and hurricane situations. This study utilized the HEC-RAS 4.1 and the CHARIMA (Dr. Forrest Holly, University of Iowa). The mode

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45

Pachler, Klaus, Thomas Frank, and Klaus Bernert. "Simulation of Unsteady Gas-Particle Flows including Two-way and Four-way Coupling on a MIMD Computer Architectur." Universitätsbibliothek Chemnitz, 2002. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200200352.

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The transport or the separation of solid particles or droplets suspended in a fluid flow is a common task in mechanical and process engineering. To improve machinery and physical processes (e.g. for coal combustion, reduction of NO_x and soot) an optimization of complex phenomena by simulation applying the fundamental conservation equations is required. Fluid-particle flows are characterized by the ratio of density of the two phases gamma=rho_P/rho_F, by the Stokes number St=tau_P/tau_F and by the loading in terms of void and mass fraction. Those numbers (Stokes number, gamma) define the f

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46

Gonc, L. Oktay. "Computation Of External Flow Around Rotating Bodies." Phd thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/12605985/index.pdf.

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A three-dimensional, parallel, finite volume solver which uses Roe&#039<br>s upwind flux differencing scheme for spatial and Runge-Kutta explicit multistage time stepping scheme for temporal discretization on unstructured meshes is developed for the unsteady solution of external viscous flow around rotating bodies. The main aim of this study is to evaluate the aerodynamic dynamic stability derivative coefficients for rotating missile configurations. Arbitrary Lagrangian Eulerian (ALE) formulation is adapted to the solver for the simulation of the rotation of the body. Eigenvalues of the Euler

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47

Szubert, Damien. "Physics and modelling of unsteady turbulent flows around aerodynamic and hydrodynamic structures at high Reynold number by numerical simulation." Phd thesis, Toulouse, INPT, 2015. http://oatao.univ-toulouse.fr/15129/2/szubert_1.pdf.

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This thesis aims at analysing the predictive capabilities of statistical URANS and hybrid RANS-LES methods to model complex flows at high Reynolds numbers and carrying out a physical analysis of the near-region turbulence and coherent structures. This study handles configurations included in the European research programmes ATAAC (Advanced Turbulent Simulation for Aerodynamics Application Challenges) and TFAST (Transition Location Effect on Shock Wave Boundary Layer Interaction). First, the detached flow in a configuration of a tandem of cylinders, positionned behind one another, is investigat

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48

Zheng, Zhi. "Electrokinetic flow in micro- and nano-fluidic components." Columbus, Ohio : Ohio State University, 2003. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1068243983.

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Thesis (Ph. D.)--Ohio State University, 2003.<br>Title from first page of PDF file. Document formatted into pages; contains xxix, 269 p.; also includes graphics (some col.). Includes abstract and vita. Advisor: A. Terry Conlisk, Biomedical Engineering Center. Includes bibliographical references (leaves 261-269).

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49

Stříž, Jaroslav. "Hydraulické posouzení rázových jevů v jezové zdrži Střekov." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-391918.

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The main aim of the thesis is to assess the origin of surge phenomena, primarily surge waves at the weir pool Střekov, using the selected methodology. The paper is divided into several parts. There is a brief introduction to the problematics and research of possible solution methods, followed by a verification of these methods on a physical model and finally an application of a numerical method for an assessment of the chosen locality.

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50

Jimenez, Aispuro Jesús Ernesto. "Ingénierie des générateurs thermoélectriques en régime instationnaire." Thesis, Pau, 2018. http://www.theses.fr/2018PAUU3028.

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Les générateurs thermoélectriques (TEG), associant des modules thermoélectriques à des échangeurs de chaleur adaptés, permettent de produire de l’électricité à partir d’une source chaude et d’une source froide. Leur utilisation, réservée actuellement à des applications de niche, va s’avérer judicieuse pour différentes applications industrielles ou domestiques en raison de la disponibilité imminente de nouveaux matériaux thermoélectriques permettant des rendements améliorés et des coûts moindres. Pour rendre plus attractive l’utilisation des TEG et améliorer le rendement global des futures inst

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