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Dissertations / Theses on the topic 'Method of hydrodynamic cavitation'

Author: Grafiati

Published: 28 May 2022

Last updated: 31 July 2025

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1

Фесенко, А. В., та Ю. М. Любимий. "Повышение эффективности шлифования при гидродинамической обработке СОЖ". Thesis, Видавництво СумДУ, 2010. http://essuir.sumdu.edu.ua/handle/123456789/11459.

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2

Bourg, David M. "Development of the Distributed Points Method with Application to Cavitating Flow." ScholarWorks@UNO, 2008. http://scholarworks.uno.edu/td/904.

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A mesh-less method for solving incompressible, multi-phase flow problems has been developed and is discussed along with the presentation of benchmark results showing good agreement with theoretical and experimental results. Results of a systematic, parametric study of the single phase flow around a 2D circular cylinder at Reynolds numbers up to 1000 are presented and discussed. Simulation results show good agreement with experimental results. Extension of the method to deal with multiphase flow including liquid-to-vapor phase transition along with applications to cavitating flow are disc

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3

Odeyemi, Babatunde O. "Hydrodynamic cavitation : effects of cavitation on inactivation of Escherichia coli (E.coli)." Thesis, Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/11009.

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4

Chanda, Suranjit Kumar. "Disintegration of sludge using ozone-hydrodynamic cavitation." Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43105.

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In our study we applied hydrodynamic cavitation and ozonation both separately and combined, to determine the synergistic effect of these two technologies for sludge disintegration. A 2 mm orifice was used as a cavitation device. Ozone was injected after cavitation at a concentration of 35 mg/L at a flow of 3 Lpm. The sludge was subjected to treatment for 90 minutes in all three cases. In a final step, combined ozone and cavitation was applied to disintegrate the sludge for 10 hours. It was found that the combination of ozonation and cavitation exhibited higher sludge disintegration capacity th

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5

Skelton, Hedley John. "Applying hydrodynamic cavitation to the activated sludge process." Thesis, University of Cambridge, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613352.

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6

Tran, David. "Hydrodynamic cavitation applied to food waste anaerobic digestion." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128268.

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Innovative pre-treatment methods applied to anaerobic digestion (AD) have developed to enhance the methane yields of food waste. This study investigates hydrodynamic cavitation, which induce disintegration of biomass through microbubble formations, impact on food waste solubilisation and methane production during following AD. Two different sub-streams of food waste (before and after the digestion) pre-treated by hydrodynamic cavitation were evaluated in lab scale for its potential for implementation in a full scale practise. First, the optimum condition for the hydrodynamic cavitation device

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Abrahamsson, Louise. "Improving methane production using hydrodynamic cavitation as pre-treatment." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-128783.

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To develop anaerobic digestion (AD), innovative solutions to increase methane yields in existing AD processes are needed. In particular, the adoption of low energy pre-treatments to enhance biomass biodegradability is needed to provide efficient digestion processes increasing profitability. To obtain these features, hydrodynamic cavitation has been evaluated as an innovative solutions for AD of waste activated sludge (WAS), food waste (FW), macro algae and grass, in comparison with steam explosion (high energy pre-treatment). The effect of these two pre-treatments on the substrates, e.g. parti

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8

Mancuso, Giuseppe. "Enhancement of wastewater and sludge treatment processes by hydrodynamic cavitation." Doctoral thesis, Università degli studi di Trento, 2017. https://hdl.handle.net/11572/367789.

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In the past decades, hydrodynamic cavitation (HC) process was the subject of study by many researchers worldwide. This phenomenon was widely studied in order to understand the reason of its negative effects on hydraulic machinery such as pumps,turbines, valves, etc. Many efforts were made in order to better understand mechanisms of HC process with the main aim of preventing its generation and trying to avoid severe physical damage such as erosions, vibrations and noises. In recent years, in order to cope with a decrease in available water resources worldwide, an increasing demand of water by p

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9

Mancuso, Giuseppe. "Enhancement of wastewater and sludge treatment processes by hydrodynamic cavitation." Doctoral thesis, University of Trento, 2017. http://eprints-phd.biblio.unitn.it/2000/1/PhD_Thesis_Mancuso_Giuseppe.pdf.

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In the past decades, hydrodynamic cavitation (HC) process was the subject of study by many researchers worldwide. This phenomenon was widely studied in order to understand the reason of its negative effects on hydraulic machinery such as pumps,turbines, valves, etc. Many efforts were made in order to better understand mechanisms of HC process with the main aim of preventing its generation and trying to avoid severe physical damage such as erosions, vibrations and noises. In recent years, in order to cope with a decrease in available water resources worldwide, an increasing demand of water by p

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10

Ramirez, David A. "Improvement of Ethanol Production on Dry-Mill Process Using Hydrodynamic Cavitation Pretreatment." The Ohio State University, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=osu1354646654.

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11

Lunnbäck, Johan. "Hydrodynamic cavitation applied to anaerobic degradation of fats, oils and greases (FOGs)." Thesis, Linköpings universitet, Tema Miljöförändring, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-140685.

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To increase profitability for biogas production, new innovative substrates and condition of operations needs to be implemented. At the current state, fats, oils and greases (FOGs) represent a promising substrate even though it brings operational challenges to the anaerobic digestion process. By utilizing hydrodynamic cavitation (HC) as a pre-treatment of the FOGs, the efficiency of FOGs’ co-digestion with wastewater sludge can be significantly improved. Preliminary experiments conducted on oil and water demonstrates that the HC pre-treatment improves the oil solubilisation as well as forms sta

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12

Pamidi, Taraka Rama Krishna. "Process Intensification by Ultrasound Controlled Cavitation." Licentiate thesis, Luleå tekniska universitet, Drift, underhåll och akustik, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-73856.

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Process industries are cornerstones in today’s industrialized society. They contribute significantly in the manufacturing of various goods and products that are used in our day-to-day life. Our society’s paradigm of consumerism accompanied by a rise in global population drives an ever increasing demand for goods. One of many strategies developed to satisfy these demands and at the same time improve production capabilities is known as process intensification. As an example, this can be accomplished by implementation of devices using the principle of hydrodynamic and acoustic cavitation. High-in

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13

Kubina, Dávid. "Dynamika kavitujícího proudění za clonou." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-378401.

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Cavitating flow through five perforated plates with different number of holes with preserved constant flow cross-section area in sum were experimentally examined. Dynamic characteristics such as dependence of pressure amplitudes and dominant frequencies on cavitation number in all regimes of cavitating flow: incipient cavitation, partial cavitation, fully developed cavitation and supercavitation are obtained. For determination of dominant frequencies several pressure transducers in two regimes of measurement were used. Results were validated with frequency spectra obtained from picture analysi

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14

Bangaru, Balasundaram. "A detailed investigation of microbial cell disruption by hydrodynamic cavitation for selective product release." Doctoral thesis, University of Cape Town, 2004. http://hdl.handle.net/11427/5345.

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Includes bibliographical references.<br>Hydrodynamic cavitation is a novel method for microbial cell disruption, mediated by intense pressure fluctuations caused by cavity oscillation and collapse. Selective release of intracellular microbial products is desirable to reduce the cost involved in their downstream processing. A study of the process variables that affect microbial cell disruption by hydrodynamic cavitation is presented in order to ascertain the conditions required for a selective release. Two model systems were considered (yeast and E. coil). Enzymes from different locations of th

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15

Heller, Winfried. "Hydro-dynamic effects with particular consideration of water quality and their measurement methods." Doctoral thesis, Tönning; Lübeck; Marburg : Der Andere Verl, 2005. http://deposit.ddb.de/cgi-bin/dokserv?idn=979397405.

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16

Atalianis, Christos Andreas. "Hydrodynamic analysis of structures by a hybrid method." Thesis, University of Newcastle Upon Tyne, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.283649.

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17

Hilares, Ruly Terán. "Hydrodynamic cavitation as a new approach for sugarcane bagasse pretreatment aiming to second generation ethanol production." Universidade de São Paulo, 2017. http://www.teses.usp.br/teses/disponiveis/97/97131/tde-07082018-153234/.

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Renewable energy sources have been proposed as a viable option to mitigate the consumption and the dependence of fossil fuels. Among the available alternatives, lignocellulosic biomass has shown great potential for bioenergy generation, and biofuels as ethanol can be obtained by fermentation from sugars present in cellulosic and hemicellulosic fractions of biomass. However, for the efficient release of fermentable sugars during the enzymatic hydrolysis step, a pretreatment process is required to modify the material in its structure and composition. In this context, hydrodynamic cavitation (HC)

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18

SWANSON, LUKE A. "A DETAILED EXAMINATION OF THE PRESSURE PRODUCED BY A HYDRODYNAMIC RAM EVENT." University of Cincinnati / OhioLINK, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1195587339.

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19

Peterson, Christopher J. S. M. Massachusetts Institute of Technology. "Minimum pressure envelope cavitation analysis using two-dimensional panel method." Thesis, Massachusetts Institute of Technology, 2008. http://hdl.handle.net/1721.1/44860.

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Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2008.<br>Includes bibliographical references (leaf 42).<br>An analysis tool for calculating minimum pressure envelopes was developed using XFOIL. This thesis presents MATLAB® executables that interface with a modified version of XFOIL for determining the minimum pressure of a foil operating in an inviscid fluid. The code creates minimum pressure envelopes, similar to those published by Brockett (1965). XFOIL, developed by Mark Drela in 1986, is a design system for Low Reynolds Number Airfoils that combines t

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20

Peterson, Christopher J. "Minimum pressure envelope cavitation analysis using two-dimensional panel method." Thesis, (927 KB), 2008. http://edocs.nps.edu/AR/topic/theses/2008/08_Peterson.pdf.

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Thesis (M.S. in Naval Architecture and Marine Engineering and M.S. in Mechanical Engineering)--Massachusetts Institute of Technology, June 2008.<br>"June 2008." Description based on title screen as viewed on August 26, 2009. DTIC Descriptor(s): Viscous Flow, Propeller Blades, Pressure Distribution, Transformations (Mathematics), Cavitation, Reynolds Number, Theses, Algorithms, Computer Programs. DTIC Identifier(s): Minimum Pressure Envelopes, Conformal Transformations, Brockett's Analysis, Karman-Trefftz Foil. Includes bibliographical references (p. 42). Also available in CD-ROM format.

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21

Čupr, Pavel. "Hydroelastic Response of Hydrofoil Under Cavitation Conditions." Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-446789.

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Tato disertační práce se zabývá experimentálním a výpočtovým výzkumem přídavných účinků od proudu kapaliny na obtékaný hydraulický profil. Dynamická odezva profilu byla analyzována pro dva typy buzení: buzení odtržením mezní vrstvy a Kármánových vírů a dále buzení pomocí externího budiče připojeného k lopatce. Experimentální měření dynamické odezvy profilu na oba typy buzení bylo provedeno pro lopatku umístěnou v kavitujícím a nekavitujícím proudění. Získané výsledky byly použity pro verifikaci přídavných účinků stanovených s využitím numerického modelování.

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22

Miranda, Gregorio do Couto. "The Detection of Journal Bearing Cavitation with Use of Ultrasound Technology." Case Western Reserve University School of Graduate Studies / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=case1459969270.

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23

Walker, Daniel Lloyd Norris. "The influence of blockage and cavitation on the hydrodynamic performance of ice class propellers in blocked flow." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp04/nq23111.pdf.

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24

Gourma, Mustapha. "Towards better understanding of the Smoothed Particle Hydrodynamic Method." Thesis, Cranfield University, 2003. http://hdl.handle.net/1826/133.

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Numerous approaches have been proposed for solving partial differential equations; all these methods have their own advantages and disadvantages depending on the problems being treated. In recent years there has been much development of particle methods for mechanical problems. Among these are the Smoothed Particle Hydrodynamics (SPH), Reproducing Kernel Particle Method (RKPM), Element Free Galerkin (EFG) and Moving Least Squares (MLS) methods. This development is motivated by the extension of their applications to mechanical and engineering problems. Since numerical experiments are one of th

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25

Ng, T. W. "A finite-element method for problems in hydrodynamic instability." Thesis, Imperial College London, 1985. http://hdl.handle.net/10044/1/37799.

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26

Martin, Hannah Louise. "A novel high-speed AC impedance method for monitoring transient cavitation." Thesis, University of Southampton, 2018. https://eprints.soton.ac.uk/427152/.

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This thesis details an investigation of bubble dynamics using a set of novel electrochemical impedance measurements with the ability to monitor the motion of bubbles during cavitation. This method was able to report dynamic information about the motion of bubbles over an electrode surface with a time resolution of 2 μs. The results produced from these impedance studies are supported by other techniques used to characterise cavitation, such as acoustic output measurements and high-speed imaging. Cavitation was generated inside a suitable electrochemical cell using a variety of sound sources. Th

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27

Miao, Tianlei. "Generation of a full-envelope hydrodynamic database for hydrobatic AUVs : Combining numerical, semi-empirical methods to calculate AUV hydrodynamic coefficients." Thesis, KTH, Marina system, 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-262038.

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The next generation of Autonomous Underwater Vehicles (AUV) can impact our observation of the world. The flight simulation and full-envelope hydrodynamics modeling can improve the performance of AUVs in terms of control, navigation and positioning. In order to achieve agile maneuverability, a more accurate database of full-envelope hydrodynamic coefficients is supposed to be generated. Two semi-empirical methods, Jorgensen and DATCOM, and two numerical method, Computational Fluid Dynamics (CFD) and XFLR5 are used to push the boundaries of hydrodynamic coefficients: lift, drag and moment coeffi

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28

Kottke, Peter Arthur. "Rheological Implications of Tension in Liquids." Diss., Georgia Institute of Technology, 2004. http://hdl.handle.net/1853/5015.

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This research investigates effects of tensile stresses in liquids. Areas of application include bearing lubrication and polymer processing, in which liquids may be subjected to hydrostatic tension or large shear stresses. A primary thrust of this research is the development of a criterion for liquid failure, or cavitation, based upon the general state of stress in the liquid. A variable pressure, rotating inner cylinder, Couette viscometer has been designed and used to test a hypothesized cavitation criterion. The criterion, that cavitation will occur when a principal normal stress in a liq

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29

Bernardi, Jean de. "Aspects expérimentaux et théoriques des instabilités de cavitation dans les turbopompes de moteurs de fusée." Grenoble INPG, 1996. http://www.theses.fr/1996INPG0217.

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Les instabilités hydrauliques et les efforts radiaux générés par la cavitation partielle sur un inducteur de turbopompe ont été étudiés en eau pour les inducteurs des turbopompes à hydrogène et à oxygène du moteur VULCAIN d’ARIANE 5. Nous avons pu établir une méthode d’identification et d’analyse des instabilités à l’aide de la synchronisation de films rapides avec des mesures d’effort, sur l’axe et avec des signaux de pression instationnaire en paroi. Des fréquences caractéristiques du phénomène de cavitation instationnaire ont alors été identifiées à différents points de fonctionnement. Cett

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30

Harp, Susan R. "A computational method for evaluating cavitating flow between rough surfaces." Diss., Georgia Institute of Technology, 2000. http://hdl.handle.net/1853/16838.

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31

Gomes, Jaime Federici. "Campo de pressões : condições de incipiência à cavitação em vertedouros em degraus com declividade 1V:0,75H." reponame:Biblioteca Digital de Teses e Dissertações da UFRGS, 2006. http://hdl.handle.net/10183/11336.

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As expectativas dinâmicas de um mundo de inovações tecnológicas, consubstanciados por explorações menos agressivas ao meio ambiente, dirigidas a um mercado consumista emergente, representam desafios para soluções de problemas de engenharia dirigidos para diversos segmentos da sociedade. Com o desenvolvimento do concreto compactado com rolo (CCR), a partir dos anos 70, o emprego de vertedouros em degraus em barragens de gravidade tornou-se uma solução atrativa, visto que, proporciona, simultaneamente, o aumento da dissipação da energia do escoamento e a redução do tempo e dos custos de implanta

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32

Tang, Ling 1963. "Interfacing hydrodynamic and water quality models with the Eulerian-Lagrangian method." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/9637.

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Thesis (Ph.D.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1998.<br>Includes bibliographical references.<br>The problem of interfacing hydrodynamic and water quality models is investigated with emphasis on modeling efficiency, accuracy and flexibility. An Eulerian-Lagrangian type of transport model is proposed for interfacing due to its superior simulation efficiency and numerical resolution in advection dominant flows. Comparisons are made between Eulerian models and Eulerian-Lagrangian models through both theoretical analyses and numerical studies o

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33

Heller, Winfried. "Hydro-dynamic Effects with Particular Consideration of Water Quality and their Measurement Methods." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2006. http://nbn-resolving.de/urn:nbn:de:swb:14-1141217614058-76453.

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Die Entwicklung der Strömungsmechanik im 20. Jahrhundert wurde auch durch intensive Forschungen geprägt, um die zahlreichen in der Praxis auftretenden hydrodynamischen Effekte zu ergründen, die physikalischen Abläufe und Zusammenhänge zu verstehen und diese mathematisch zu beschreiben. Dies wurde notwendig, da mit den hydrodynamischen Grundgleichungen allein keine Beschreibung der aus den Fluideigenschaften resultierenden Erscheinungen in Flüssigkeitsströmungen möglich war. Um die Qualität der Flüssigkeiten bezüglich ihres Gasgehaltes und ihrer Keimverteilung beurteilen zu können, wurden mit B

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34

Daou, Maya Mounir. "Investigation of the plate-impact method as a precursor of physical phenomena and chemical processes." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066245/document.

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Ce manuscrit a pour but d'étudier un nouveau dispositif générateur de cavitation dont le potentiel favorable à l'intensification de réactions chimiques est évalué. Ce dispositif est constitué d'une plaque mobile qui frappe un liquide contenu dans un réacteur. L'impact génère une forte augmentation de pression dans le milieu suivi d'une dépressurisation. Nous montrons que la couche de gaz/vapeur piégée entre le piston et la surface du liquide influence les pics de pression et les fréquences générées dans le milieu. La visualisation à l'aide d'une caméra rapide montre que la dépressurisation act

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35

Malan, Leon. "Direct numerical simulation of free-surface and interfacial flow using the VOF method : cavitating bubble clouds and phase change." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066555/document.

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La présente étude se fonde sur la méthode du volume de fluide (en anglais VOF pour Volume-of-Fluid), proposée à l'origine par Hirt et Nicols. L'objectif de la première partie de ce travail est l'étude hydrodynamique de la cavitation isotherme dans les grands nuages de bulles. Cette étude s'inscrit plus généralement dans un large effort de recherche en micro--écaillage mené par le CEA. Une méthode capable de traiter la présence de cavités de vapeur de volume variable ou encore de pores a été formulée et implémentée dans un code existant, PARIS. L'écoulement est idéalisé en supposant un liquide

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36

Looten-Baquet, Isabelle. "Etude et caractérisation de l'activité des champs de bulles générées par cavitation ultrasonore." Valenciennes, 1996. https://ged.uphf.fr/nuxeo/site/esupversions/1c0a52f3-bfd0-437a-8d3c-877eb1bb54f7.

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La cavitation ultrasonore intervient dans un liquide lorsque les variations locales de pression, causées par la propagation d'une onde ultrasonore de forte puissance, sont suffisamment importantes pour qu'il y ait création de microbulles, ou pour que les microbulles préexistantes dans le liquide se déforment notablement. Le comportement oscillatoire de chaque bulle formée dépend alors de l'amplitude de l'onde ultrasonore et de la taille des bulles par rapport à la longueur d'onde ultrasonore. Les bulles peuvent présenter deux régimes d'oscillations radiales différents: elles peuvent soit oscil

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37

Patouna, Stavroula. "A CFD STUDY OF CAVITATION IN REAL SIZE DIESEL INJECTORS." Doctoral thesis, Universitat Politècnica de València, 2012. http://hdl.handle.net/10251/14723.

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In Diesel engines, the internal flow characteristics in the fuel injection nozzles, such as the turbulence level and distribution, the cavitation pattern and the velocity profile affect significantly the air-fuel mixture in the spray and subsequently the combustion process. Since the possibility to observe experimentally and measure the flow inside real size Diesel injectors is very limited, Computational Fluid Dynamics (CFD) calculations are generally used to obtain the relevant information. The work presented within this thesis is focused on the study of cavitation in real size automotive

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Klenow, Bradley. "Finite and Spectral Element Methods for Modeling Far-Field Underwater Explosion Effects on Ships." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/37648.

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The far-field underwater explosion (UNDEX) problem is a complicated problem dominated by two phenomena: the shock wave traveling through the fluid and the cavitation in the fluid. Both of these phenomena have a significant effect on the loading of ship structures subjected to UNDEX. An approach to numerically modeling these effects in the fluid and coupling to a structural model is using cavitating acoustic finite elements (CAFE) and more recently cavitating acoustic spectral elements (CASE). The use of spectral elements in CASE has shown to offer the greater accuracy and reduced computationa

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PANINI, FILIPPO. "Pore-scale characterization of rock images: geometrical analysis and hydrodynamic simulation." Doctoral thesis, Politecnico di Torino, 2022. http://hdl.handle.net/11583/2970983.

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40

Emerson, Sean Christian. "Synthesis of Nanometer-size Inorganic Materials for the Examination of Particle Size Effects on Heterogeneous Catalysis." Digital WPI, 2000. https://digitalcommons.wpi.edu/etd-dissertations/253.

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The effect of acoustic and hydrodynamic cavitation on the precipitation of inorganic catalytic materials was investigated. The overall objective was to understand the fundamental factors involved in synthesizing nanometer-size catalytic materials in the 1-10 nm range in a cavitating field. Materials with grain sizes in this range have been associated with enhanced catalytic activity compared to larger grain size materials. A new chemical approach was used to produce titania supported gold by coprecipitation with higher gold yields compared to other synthesis methods. Using this approach, it wa

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41

Andreussi, Tommaso. "A variational treatment of hydrodynamic and magnetohydrodynamic flows." Doctoral thesis, Scuola Normale Superiore, 2007. http://hdl.handle.net/11384/85792.

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In order to describe stationary plasma flows in thrusters based on plasma propulsion, an ideal, axial symmetric, single-fluid motion is assumed. The conservation laws of conductive fluids and the Maxwell’s equations lead to a second order differential equation for the magnetic flux function ψ, i.e. the generalized Grad Shafranov (GS) equation, and to two implicit constraints relating ψ to the plasma density and the azimuthal velocity. This set of three equations, one differential and two algebraic, is then expressed using a variational approach and the solution is obtained in a straightf

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42

Pham, Tuyet Mai. "La mesure des populations de germes de cavitation : qualification et optimisation d'un compteur dynamique à ogive centrale." Université Joseph Fourier (Grenoble), 1995. http://www.theses.fr/1995GRE10235.

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Le present travail est consacre a la realisation d'un appareil de mesure dynamique de populations de germes de cavitation. L'objectif de l'etude est de definir une conception de reference du compteur a ogive centrale la mieux caracterisee possible, tant sur le plan de la geometrie de l'appareil que sur le plan des limites de fonctionnement et des precisions de mesure. Notre etude s'articule autour de deux themes: la conception et la qualification de l'appareil. Une premiere etape consiste a optimiser le capteur hydrodynamique compte-tenu des contraintes imposees par les interactions entre la c

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Nguyen, Khanh Quoc. "Hydrodynamic Study of Pisciform Locomotion with a Towed Biolocomotion Emulator." Thesis, Virginia Tech, 2021. http://hdl.handle.net/10919/103626.

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The ability of fish to deform their bodies in steady swimming action is gaining from robotic designers. While bound by the same physical laws, fish have evolved to move in ways that often outperform artificial systems in critical measures such as efficiency, agility, and stealth through thousands of years of natural selection. As we expand our presence in the ocean with deep-sea exploration or offshore drilling for petroleum and natural gas, the demand for prolonging underwater operations is growing significantly. Therefore, it is critical for robotic designers to understand the physics of pis

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St-Germain, Philippe. "Numerical Modeling of Tsunami-induced Hydrodynamic Forces on Free-standing Structures Using the SPH Method." Thèse, Université d'Ottawa / University of Ottawa, 2012. http://hdl.handle.net/10393/23527.

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Tsunamis are among the most terrifying and complex physical phenomena potentially affecting almost all coastal regions of the Earth. Tsunami waves propagate in the ocean over thousands of kilometres away from their generating source at considerable speeds. Among several other tsunamis that occurred during the past decade, the 2004 Indian Ocean Tsunami and the 2011 Tohoku Tsunami in Japan, considered to be the deadliest and costliest natural disasters in the history of mankind, respectively, have hit wide stretches of densely populated coastal areas. During these major events, severe destructio

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Piché, Steffanie. "Numerical Modeling of Tsunami Bore Attenuation and Extreme Hydrodynamic Impact Forces Using the SPH Method." Thèse, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30456.

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Understanding the impact of coastal forests on the propagation of rapidly advancing onshore tsunami bores is difficult due to complexity of this phenomenon and the large amount of parameters which must be considered. The research presented in the thesis focuses on understanding the protective effect of the coastal forest on the forces generated by the tsunami and its ability to reduce the propagation and velocity of the incoming tsunami bore. Concern for this method of protecting the coast from tsunamis is based on the effectiveness of the forest and its ability to withstand the impact forces

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Mantzaris, Demetrios Alexis 1968. "A Rankine panel method as a tool for the hydrodynamic design of complex marine vehicles." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50364.

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Podbevsek, Darjan. "Optical probing of thermodynamic parameters and radical production in cavitating micro-flows." Thesis, Lyon, 2018. http://www.theses.fr/2018LYSE1210/document.

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Une zone de constriction dans un micro-canal fluidique peut générer, si le débit est suffisant, un écoulement bi-phasique. Ceci est l’origine de la cavitation hydrodynamique. Les échanges de chaleur latente générés par l’apparition et l’implosion des bulles impliquent une variabilité importante de la température dans les zones au-delà de la constriction. En ajoutant des sondes de température nanométriques dans le fluide et en utilisant un microscope confocal on peut déterminer la température en un point. Ainsi on a pu établir des cartographies thermiques en 2 et 3 dimensions à l’intérieur d’un

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Chiricotto, Mara. "Hydrodynamic effect on β-amyloid peptide aggregation". Thesis, Sorbonne Paris Cité, 2016. http://www.theses.fr/2016USPCC136/document.

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Un fait marquant et essentiel de la maladie neurodégénérative d’Alzheimer est la formation de plaques amyloïdes dans le cerveau, résultat de l’agrégation des protéines amyloïde-β (Aβ1-40/1-42). Le développement de nouveaux médicaments requiert la compréhension des mécanismes de formation des fibres amyloïdes et la connaissance de la structure et dynamique des oligomères métastables qui sont les vecteurs principaux de la neurotoxicité. Parce que les simulations atomistiques en solvant explicite ne peuvent pas être réalisées sur de grands systèmes pour des temps très longs, nous avons opté pour

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Marth, Wieland. "Hydrodynamic Diffuse Interface Models for Cell Morphology and Motility." Doctoral thesis, Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-204651.

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In this thesis, we study mathematical models that describe the morphology of a generalized biological cell in equilibrium or under the influence of external forces. Within these models, the cell is considered as a thermodynamic system, where streaming effects in the cell bulk and the surrounding are coupled with a Helfrich-type model for the cell membrane. The governing evolution equations for the cell given in a continuum formulation are derived using an energy variation approach. Such two-phase flow problems that combine streaming effects with a free boundary problem that accounts for bendin

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Jones, Samuel Edward. "Symmetries in the kinematic dynamos and hydrodynamic instabilities of the ABC flows." Thesis, University of Exeter, 2013. http://hdl.handle.net/10871/14689.

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This thesis primarily concerns kinematic dynamo action by the 1:1:1 ABC flow, in the highly conducting limit of large magnetic Reynolds number Rm. The flow possesses 24 symmetries, with a symmetry group isomorphic to the group O24 of orientation-preserving transformations of a cube. These symmetries are exploited to break up the linear eigenvalue problem into five distinct symmetry classes, which we label I-V. The thesis discusses how to reduce the scale of the numerical problem to a subset of Fourier modes for a magnetic field in each class, which then may be solved independently to obtain di

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