Дисертації з теми "Hydrodynamics and hydraulic engineering"
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Mulahasan, Saad. "Hydrodynamics of large-scale roughness in open channels." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/95099/.
Повний текст джерелаTatlock, Benjamin. "A hybrid finite-volume finite-difference rotational Boussinesq-type model of surf-zone hydrodynamics." Thesis, University of Nottingham, 2015. http://eprints.nottingham.ac.uk/30443/.
Повний текст джерелаFriedrichs, Carl T. "Hydrodynamics and morphodynamics of shallow tidal channels and intertidal flates /." Woods Hole, Mass. : Woods Hole Oceanographic Institution, 1993. http://hdl.handle.net/1912/1176.
Повний текст джерела"Doctoral dissertation." "February 1993." At head of title: Woods Hole Oceanographic Institution, Massachusetts Institute of Technology. Includes bibliographical references (p. 205-214).
Thein, Myint. "Experimental investigation of flow resistance and velocity distributions in a rectangular channel with large bed-roughness elements." Diss., Georgia Institute of Technology, 1993. http://hdl.handle.net/1853/19580.
Повний текст джерелаLu, Zhihua. "Stochastic modelling of unsteady open channel flow and reliability analysis /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?CIVL%202008%20LU.
Повний текст джерелаAmini, Sina. "Hydrodynamics and Salinity of Pontchartrain Estuary During Hurricanes." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1845.
Повний текст джерелаKhodier, Mohanad A. "Weir-Baffled Culvert Hydrodynamics Evaluation for Fish Passage Using Particle Image Velocimetry and Computational Fluid Dynamic Techniques." DigitalCommons@USU, 2014. https://digitalcommons.usu.edu/etd/3078.
Повний текст джерелаYeow, Kervin. "Three dimensional scour along offshore pipelines." University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2008.0008.
Повний текст джерелаVenugopal, Vengatesan. "Hydrodynamic force coefficients for rectangular cylinders in waves and currents." Thesis, University of Glasgow, 2002. http://theses.gla.ac.uk/6351/.
Повний текст джерелаCooper, Alison Jane. "The effects of rotation and wall compliance on hydrodynamic stability." Thesis, University of Warwick, 1996. http://wrap.warwick.ac.uk/109582/.
Повний текст джерелаWells, Jared Lawrence. "Effect of angular orientation on the hydrodynamic forces acting on a body in a restricted waterway." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/41572.
Повний текст джерелаA slender body theory method developed for a body moving parallel to a wall in shallow water is extended to include angular orientation of the body to the wall. The method satisfies only the zero normal velocity condition on the external boundaries but does not take into account the effect of induced flows on the body itself. A spheroid and a Series 60, block .80 hull were the bodies studied. The side force and yaw moment on each body were determined numerically for varying angular orientation with respect to either a single wall or canal bank. For both cases results for a range of depths and wall separation distances are presented. It is found that the method gives good qualitative side force predictions for a body moving parallel to a wall, but is unable to correctly predict the yaw moment or the side force due to angular orientation. This result dictates the need for a more complex mathematical model to properly represent the flow than the simple model and quasiâ steady method used here.
Master of Science
Ou, Zhiliang. "Numerical simulation of flow around vertical cylinders." University of Western Australia. School of Civil and Resource Engineering, 2007. http://theses.library.uwa.edu.au/adt-WU2007.0185.
Повний текст джерелаChan, Hoi Sang. "A three-dimensional technique for predicting first-and second-order hydrodynamic forces on a marine vehicle advancing in waves." Thesis, University of Glasgow, 1990. http://theses.gla.ac.uk/1490/.
Повний текст джерелаShi, Jie. "Integrated modelling of hydrological and hydrodynamic processes, dynamic bacteria decay with climate change and intensive farming in riverine and estuarine water." Thesis, Cardiff University, 2016. http://orca.cf.ac.uk/98617/.
Повний текст джерелаEvans, Paul Stephen. "Hydrodynamic characteristics of macrotidal straits and implications for tidal stream turbine deployment." Thesis, Cardiff University, 2014. http://orca.cf.ac.uk/70531/.
Повний текст джерелаMancilla, Alarcón Cristhian A. "Hydrodynamic loadings and responses of a floating guardwall a fluid-structure interaction problem /." Master's thesis, Mississippi State : Mississippi State University, 2005. http://library.msstate.edu/content/templates/?a=72.
Повний текст джерелаTeran, Gonzalez Grecia A. "3-D Hydrodynamic and Non-Cohesive Sediment Transport Modeling in the Lower Mississippi River." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1837.
Повний текст джерелаGurung, Tshering T. "One-Dimensional Dynamic Modeling of the Lower Mississippi River." ScholarWorks@UNO, 2014. http://scholarworks.uno.edu/td/1804.
Повний текст джерелаGirtz, Anne Marie. "Hydraulic and Hydrodynamic Stormwater Model for the Västanfors Area of the Municipality of Fagersta, Sweden: Climate Change Impacts and Future Stormwater Management." Thesis, KTH, Mark- och vattenteknik (flyttat 20130630), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-210711.
Повний текст джерелаDen globala temperaturen och frekvensen av extrema väderhändelser har ökat under de senaste tio åren, med 2015 globalt det varmaste året på posten. Framtida klimatmodeller är förenliga med denna trend, nederbörden förutsägs variera mer från år till år, mer nederbörd i större enskilda händelser, och mer frekventa extrema händelser. Förändringar i väderfenomen till följd av klimatförändringarna kommer att påverka infrastrukturen i städerna och därmed samhällets sårbarhet. Dagens urbana dagvattensystem är nära besläktade med lokala hydrologiska egenskaper, med system som syftar till att tillgodose specifika regn intervaller baserat på historiska data. En ökning av nederbörd eller extrema väderförhållanden kan leda till kapacitetsproblem för dessa system, och i sin tur negativa konsekvenser för människor och miljö. Dagvattenhantering i Sverige styrs av kommunala planer och landsomfattande normer för utformning. Inom dessa dokument finns information om vem som är ansvarig och vilka normer måste uppfyllas, men det finns en brist på särskilda krav på hur dessa uppgifter skall utföras. Nyligen har Svenskt Vatten börjat inse behovet av en mer definierad dagvattenhantering metodik, och beställt en undersökning med titeln "Riktlinjer för modellering av avloppsvatten bärsystem och dagvattensystem". Medan större kommuner har resurser att utveckla hydrauliska modeller, är mindre kommuner ofta utanför denna enhet för proaktiv hantering. Ofta finns det inget krav på initiativ huvudplanering, och mer realistiskt, att ingen budget avsätts för dessa initiativ. Således är dagvattenhantering kvar med konventionella metoder och genomförs endast vid behov, med minimal långsiktig planering. Denna avhandling visar hur en hydraulisk datormodell kan fungera som en enkel, låg kostnad verktyg för att hjälpa kommuner - särskilt de mindre storlek - i hållbar planering och förvaltning av sina dagvattensystem. En fallstudie användes för att exemplifiera målet, genom att visa en föreslagen metod som kan användas för att bedöma effekterna av klimatförändringarna på urban infrastruktur. Denna studie genomfördes i samarbete med ÅF Infrastruktur AB i Stockholm och kommunen Fagersta.
Anderson, Brett Gordon. "Quantifying the interaction between riparian vegetation and flooding : from cross-section to catchment scale /." Connect to thesis, 2006. http://repository.unimelb.edu.au/10187/2086.
Повний текст джерелаGerber, George. "Unsteady pipe-flow using the Petrov-Galerkin finite element method." Thesis, Stellenbosch : Stellenbosch University, 2004. http://hdl.handle.net/10019.1/50214.
Повний текст джерелаENGLISH ABSTRACT: Presented here is an Eulerian scheme for solving the unsteady pipe-flow equations. It is called the Characteristic Dissipative Petrov-Galerkin finite element algorithm. It is based on Hicks and Steffler's open-channel finite element algorithm [5]. The algorithm features a highly selective dissipative interface, which damps out spurious oscillations in the pressure field while leaving the rest of the field almost unaffected. The dissipative interface is obtained through upwinding of the test shape functions, which is controlled by the characteristic directions of the flow field at a node. The algorithm can be applied to variable grids, since the dissipative interface is locally controlled. The algorithm was applied to waterhammer problems, which included reservoir, deadend, valve and pump boundary conditions. Satisfactory results were obtained using a simple one-dimensional element with linear shape functions.
AFRIKAANSE OPSOMMING: 'n Euleriese skema word hier beskryf om die onbestendige pypvloei differensiaal vergelykings op te los. Dit word die Karakteristieke Dissiperende Petrov-Galerkin eindige element algoritme genoem. Die algoritme is gebaseer op Hicks en Steffler se oop-kanaal eindige element algoritme [5]. In hierdie algoritme word onrealistiese ossilasies in die drukveld selektief gedissipeer, sonder om die res van die veld te beinvloed. Die dissiperende koppelvlak word verkry deur stroomop weegfunksies, wat beheer word deur die karakteristieke rigtings in die vloeiveld, by 'n node. Die algoritme kan dus gebruik word op veranderbare roosters, omdat die dissiperende koppelvlak lokaal beheer word. Die algoritme was toegepas op waterslag probleme waarvan die grenskondisies reservoirs, entpunte, kleppe en pompe ingesluit het. Bevredigende resultate was verkry vir hierdie probleme, al was die geimplementeerde element een-dimensioneel met lineere vormfunksies.
Shao, Zhiyu S. "TWO-DIMENSIONAL HYDRODYNAMIC MODELING OF TWO-PHASE FLOW FOR UNDERSTANDING GEYSER PHENOMENA IN URBAN STORMWATER SYSTEM." UKnowledge, 2013. http://uknowledge.uky.edu/ce_etds/5.
Повний текст джерелаStafne, Brice E. "Development and application of a two-dimensional hydrodynamic model for assessment of modern and historical flow conditions of Upper Mississippi River Pool 8 near La Crosse, Wisconsin." Thesis, University of Iowa, 2012. https://ir.uiowa.edu/etd/3537.
Повний текст джерелаDriss, Slim. "Hydraulic design of culverts." Thesis, University of British Columbia, 1988. http://hdl.handle.net/2429/28377.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
Smith, Heather Dianne. "Flow and sediment dynamics around three-dimensional structures in coastal environments." Columbus, Ohio : Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1196261689.
Повний текст джерелаHodgkinson, Derek Anthony Martin. "Computer graphics applications in offshore hydrodynamics." Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/26705.
Повний текст джерелаApplied Science, Faculty of
Civil Engineering, Department of
Graduate
McKillip, Michael Lee. "Coupling the Hydrodynamic and Water Quality Model CE-QUAL-W2 With a Multi-Trophic Fish Bio-Energetics Model for Lake Roosevelt, Washington." PDXScholar, 2008. https://pdxscholar.library.pdx.edu/open_access_etds/3078.
Повний текст джерелаJonsson, Patrick. "Smoothed particle hydrodynamics in hydropower applications : modeling of hydraulic jumps." Licentiate thesis, Luleå tekniska universitet, Strömningslära och experimentell mekanik, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-16867.
Повний текст джерелаGodkänd; 2013; 20130425 (patjon); Tillkännagivande licentiatseminarium 2013-05-29 Nedanstående person kommer att hålla licentiatseminarium för avläggande av teknologie licentiatexamen. Namn: Patrick Jonsson Ämne: Strömningslära/Fluid Mechanics Uppsats: Smoothed Particle Hydrodynamics in Hydropower Applications Modelling of Hydraulic Jumps Examinator: Professor Staffan Lundström, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Diskutant: Doktor, forskare Gustaf Gustafsson, Institutionen för teknikvetenskap och matematik, Luleå tekniska universitet Tid: Torsdag den 20 juni 2013 kl 09.00 Plats: E231, Luleå tekniska universitet
Wu, Gangwei. "Drag reduction in large diameter hydraulic capsule pipeline /." free to MU campus, to others for purchase, 1998. http://wwwlib.umi.com/cr/mo/fullcit?p9904874.
Повний текст джерелаYang, Bo. "Elastohydrodynamic model of reciprocating hydraulic rod seals." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34747.
Повний текст джерелаTajima, Yoshimitsu 1972. "Surf zone hydrodynamics." Thesis, Massachusetts Institute of Technology, 2001. http://hdl.handle.net/1721.1/84236.
Повний текст джерелаOverby, Darryl Ray 1974. "Hydrodynamics of aqueous humor outflow." Thesis, Massachusetts Institute of Technology, 2002. http://hdl.handle.net/1721.1/89882.
Повний текст джерелаIncludes bibliographical references (p. 277-286).
Primary open-angle glaucoma (POAG) is a leading cause of irreversible blindness resulting from elevated intraocular pressure caused by a pathologic increase in the resistance to aqueous humor outflow from the eye. Currently, the physiological and ultrastructural bases for the generation of aqueous humor outflow resistance remain unclear in both the normal and glaucomatous eye, although experimental evidence suggests that the extracellular matrix within the juxtacanalicular connective tissue (JCT) is the principle resistive element. Johnson, Shapiro et al. (1992) have postulated that the resistance of the JCT is further increased by a hydrodynamic "funneling" interaction whereby the available area for aqueous flow through the JCT is reduced by the constraint that aqueous must cross the inner wall endothelium of Schlemm's canal through discrete pores. In this study, we focus on uncovering the role of the JCT in the generation of aqueous humor outflow resistance in the non-glaucomatous eye. Quick-freeze/deep-etch (QF/DE) electron microscopy was used to visualize the extracellular matrix within the JCT. A novel stereologic theory was developed to relate the two-dimensional void area and perimeter observed on a micrograph to the three-dimensional tissue porosity and specific surface, allowing the hydraulic resistance of an extracellular matrix to be estimated from a QF/DE micrograph. Extensive numerical studies were conducted to validate the predictions of the stereologic theory. To investigate the funneling effect,
(cont.) morphologic changes that would disrupt funneling were proposed and investigated to determine their role in the "washout" phenomenon (the progressive decrease in aqueous outflow resistance measured during experimental perfusion of non-human eyes). QF/DE revealed the presence of empty space devoid of extracellular matrix within the JCT. Washout was found to act through a reversible separation of the JCT from the basal lamina of the inner wall endothelium that was proposed to eliminate funneling. These results challenge the belief that aqueous outflow resistance is generated by extracellular matrix within the JCT. This study also suggests that the molecular components responsible for tethering the inner wall to the JCT are important regulators of aqueous humor outflow resistance in the normal eye and thereby represent potential targets for treatment of POAG.
by Darryl Ray Overby.
Ph.D.
Sit, Arthur John. "Hydrodynamics of aqueous humour outflow." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/11499.
Повний текст джерелаElfving, Maria. "Hydraulic closed loop control." Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-234932.
Повний текст джерелаSyftet med det här examensarbete är att undersöka olika metoder för återkopplad reglering av hydrauliskt tryck i en transmission för att göra det mer exakt. Detta är önskvärt eftersom det minskar bränsleåt- gången och utsläpp, och gör även körupplevelsen bättre. För att kunna studera transmission tas en Simulink-modell fram in- nehållande de delar som är relevanta för problemet, och från detta kan en linjär modell erhållas. Tre olika regulatorer tas fram och im- plementeras i Simulink-modellen, för att kunna jämföra och analysera de olika lösningarna. De regulatorer som tas fram är PI-regulator, PID- regulator och LQR-regualator. Resultaten från simuleringen med de olika regulatorerna visar stegs- var under varierande förutsättningar för att kunna utvärdera hur de presterar. Resultaten visar att alla regulatorer uppfyller kraven på ett stegsvar under bättre förhållanden, men LQR-regulatorn presterar bäst under svårare förhållanden. LQR-regulatorn är därför den mest relevanta reglerstrategin för det här problemet av de tre
Jaipal, Prithviraj. "Hydraulic hybrids." Thesis, KTH, Fordonsdynamik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224159.
Повний текст джерелаZhang, Jing 1961. "System identification of bladder hydrodynamics." Thesis, McGill University, 1994. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=26440.
Повний текст джерелаThe bladders of six minipigs, three normal and three obstructed, were subjected to stochastic volume perturbations about different average volume levels and evoked pressure changes were measured. The hydrodynamic stiffness transfer function relating volume and pressure was calculated and described by a second-order, lumped parametric model having inertial, viscous and elastic terms. Estimates of the elastic constant (K) increased linearly with volume in both normal and obstructed animals. The rate of increase was substantially greater in the obstructed animals than in the normals. Consequently, this approach shows promise for distinguishing normal and obstructed bladder mechanics.
DePaoli, Laura L. (Laura Lynn) 1975. "Numerical modeling of wetland hydrodynamics." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/80587.
Повний текст джерелаGeçer, Onur. "Shape optimization theory and applications in hydrodynamics." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/33581.
Повний текст джерелаIncludes bibliographical references (leaves 88-89).
The Lagrange multiplier theorem and optimal control theory are applied to a continuous shape optimization problem for reducing the wave resistance of a submerged body translating at a steady forward velocity well below a free surface. In the latter approach, when the constraint formed by the boundary conditions and the Laplace's governing equation is adjoined to the objective functional to construct the Lagrangian, the dependence of the state on the control is disconnected and they are treated as independent variables; whereas in the first approach, dependences are preserved for the application of Lagrange multiplier theorem. Both methods are observed to yield identical solutions and adjoint equations. Two alternative ways are considered for determining the variation of the objective functional with respect to the state variable which is required to solve the adjoint equation defined on the body boundary. Comparison of these two ways also revealed identical solutions. Finally, a free surface boundary is included in the optimization problem and its effect on the submerged body shape optimization problem is considered.
(cont.) Noting that the analytical solution to the local optimization problem holds for any initial body geometry, it is therefore concluded that the above study will provide theoretical background for an efficient hydrodynamic shape optimization module to be coupled with up-to-date flow solvers currently available such as SWAN.
by Onur Geçer.
S.M.
Donis, Peter Andrew. "Lattice gas hydrodynamics with Galilean invariance." Thesis, Massachusetts Institute of Technology, 1988. http://hdl.handle.net/1721.1/44669.
Повний текст джерелаWolfgang, Meldon J. (Meldon John) 1971. "Hydrodynamics of flexible-body swimming motions." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9546.
Повний текст джерелаIncludes bibliographical references (p. 372-390).
The performance and agility of fish swimming motions have intrigued both biologists and fluid mechanicians for many years. Both have endeavored to understand the mechanics of fish swimming and to resolve the paradoxical observations surrounding the performance of fish, yet the unsteady hydrodynamics are not well-understood. In this thesis, the hydrodynamics of the fish-like swimming motions of a flexible body are examined through numerical simulation. Two- and three-dimensional boundary integral panel methods are developed which can model the steady straight-line swimming and unsteady maneuvering motions of a flexible-body of arbitrary thickness. Multiple, desingularized, infinitesimal wake sheet representation models the nonlinear dynamics of thin shear layer vorticity shed from an arbitrary number of predefined wake separation edges. The integrated performance quantities and the near-body unsteady flow features are corroborated through experimental comparisons. Employing this numeric scheme for a variety of fish forms, the unsteady flow dynamics are resolved in great detail and are found to be much more complex than that predicted by linear theory. In addition, fundamental mechanisms of near-body flow actuation, body-generated vorticity release, and wake vorticity control are found which allow the fish to generate thrust efficiently, to achieve outstanding performance, and to generate large, short-duration maneuvering forces. Specifically, the straight-line swimming motions of a flexible-body are studied through simulation of several fish geometries. Comparison to classical linear theory highlights the importance of the vortical dynamics in achieving performance and the complexity of the near-body flow patterns. The flow around the body is found to be highly longitudinal through systematic visualization of the body cross-sectional and waterline planes. A body-generated vortex ring structure, created through localized body undulations, actuates the smooth near-body longitudinal flow patterns around much of the fish body, resulting in strong vertical vorticity components bounding the wake thrust jet. Regions of high propulsive efficiency are identified for certain prescribed kinematics, and the performance is found to be strongly dependent on kinematic variation, recoil motions, and geometric modeling choices. Maneuvering hydrodynamics of fish swimming are studied through the simulation of a 60° "C" -turn of a Giant Dania. The formation and controlled release of body-generated vorticity through local contortions of the backbone is shown to affect the formation of a turning thrust jet for rapid maneuvering. The interaction body-generated free vorticity and regions of high fluid momentum with the sweeping motion of the tail fin is similarly shown to affect both the strength and direction of the turning jet. Through simulation of these straight-line swimming and unsteady maneuvering motions, fundamental mechanisms of vorticity control utilized by the fish are identified. Body-generated vorticity released by the body upstream is actuated by the motion of the oscillating tail fin, resulting in complex wake-wake-body interactions for varying kinematics. These interactions may enhance the performance by increasing thrust or increasing efficiency; similarly, large drag forces may be enhanced through constructive interaction of the wakes. Several novel vorticity control modes are elucidated for both straight-line steady swimming and unsteady maneuvering motions. Mechanisms of near-body flow actuation and vorticity control by the motions of swimming flexible-bodies and oscillating lifting surfaces may have tremendous potential for application to vehicle design and to unsteady maneuvering systems.
by Meldon John Wolfgang, IV.
Ph.D.
Ward, Britton Reynolds. "The hydrodynamics of sailboat bailing devices." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/41008.
Повний текст джерелаHadjerioua, Boualem 1957. "Behavior of hydraulic jump basins." Thesis, The University of Arizona, 1990. http://hdl.handle.net/10150/291709.
Повний текст джерелаMarkonda, Raviteja, and Pratikchandra J. Vasava. "IMPROVED DESIGN FOR HYDRAULIC VALVE AND HYDRAULIC VALVE TESTING RIGIMPROVED DESIGN FOR HYDRAULIC VALVEAND HYDRAULIC VALVE TESTING RIG : DESIGN AND PRODUCT DEVELOPMENT." Thesis, Högskolan i Halmstad, Akademin för ekonomi, teknik och naturvetenskap, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:hh:diva-29534.
Повний текст джерелаBrian, Harold Malcolm. "The hydrodynamics of single and multiple moonpools." Thesis, Queen's University Belfast, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.334552.
Повний текст джерелаIsmail, Ernesto Bram. "Smoothed particle hydrodynamics for nonlinear solid mechanics." Master's thesis, University of Cape Town, 2009. http://hdl.handle.net/11427/11888.
Повний текст джерелаIncludes bibliographical references (leaves 115-117).
Smooth Particle Hydrodynamics (SPH) is one of the simplest meshless methods currently in use. The method has seen significant development and has been the germination point for many other meshless methods. The development of new meshless methods regularly uses standard SPH as a starting point, while trying to improve on issues related to consistency and stability. Despite these perceived flaws it is favoured by many researchers because of its simple structure and the ease with which it can be implemented.
Koren, David W. "Column hydrodynamics of solvent in pulp processing." Thesis, University of Ottawa (Canada), 1987. http://hdl.handle.net/10393/5463.
Повний текст джерелаBottom, Richard Glenn II. "On the hydrodynamics of ray-like swimming." Thesis, State University of New York at Buffalo, 2014. http://pqdtopen.proquest.com/#viewpdf?dispub=1561510.
Повний текст джерелаDiscovering the key-features of how aquatic swimmers such as stingrays propel themselves in nature can inspire the next generation of underwater vehicles with improved maneuverability and decreased noise signatures. To discover the key-features of stingrays swimming, fluid-structure interaction simulations of a self-propelled virtual stingray, modeled closely after the freshwater stingray, Potamotrygon orbignyi, are performed. The first closed-form kinematics description of the stingray's body motion was developed from three-dimensional experimental measurements of undulatory body motion of the fresh water stingray, Potamotrygon orbignyi, which is prescribed in our simulations. The self-propelled simulations produce a high-resolution view of the three-dimensional flow field and quantifiable forces created from the stingray's swimming unobtainable by other experimental means. A leading edge vortex (LEV) was discovered to be present on the pectoral disc of the stingray, which drastically affects the hydrodynamic forces and the pressure distribution on its disc. The LEV was found to stays attached to the stingray's body until its swimming cycle reverses direction at which time the vortex detaches to travels along with the stingray's swimming undulations, creating pressure differentials across the surfaces of the stingray which promotes thrust. At the time instance of highest thrust generation during its swimming cycle, three separate vortices present on the stingrays body, all of which were formed on the leading edge, are creating a pressure distribution promoting thrust. This finding can inspire new propulsive fins that generate LEV instead of mitigating separation.
Imas, Leonard G. 1968. "Hydrodynamics involving a free-surface body juncture." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/10095.
Повний текст джерелаPetelina, Nina. "Hydrodynamics of magnet-coil actuated robotic fish." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/112550.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (page 44).
The hydrodynamics of two robotic fish were analyzed: a low cost toy robotic fish for developing live fish experimental techniques, HEXBUG(TM) Aquabot, and a low cost robotic fish for swarm robotics experiments, Scuba Fish. Both of these robotic fish use a magnet-coil actuation method in order to create caudal fin motion. A velocity imaging technique,, Particle Image Velocimetry (PIV), was used in order to characterize the wake structure created by the tail beat. Both robotic fish were towed through water as a high speed camera recorded the movement of seeding particles around the caudal fin, which are illuminated with a laser. From 2D PIV and 3D Synthetic Aperture PIV experiments for the Aquabots it has been identified that the discrete tail beat from the bang bang control creates vortex pairs at each start or stop motion of the caudal fin. Moreover, the wake structure from the shark Aquabot tail beat creates a wake structure similar to live dogfish sharks. Since the design of the Scuba Fish allowed more control over the motion of the tail, an additional ramp pwm caudal fin control was designed and tested in order to analyze the wake from a continuous tail beat. The results show that the vortex shedding pattern created by the pwm ramp design is different from the bang bang cases; the method creates a negative vortex ring with a small vortex pair at the end of the motion. This suggests that further designs of a continuous control have to be investigated in order to achieve a more real fish-like swimming behavior.
by Nina Petelina.
S.B.
Olaoye, Abiodun Timothy. "Hydrodynamics of unconventional SWATH vessels in waves." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/100101.
Повний текст джерелаCataloged from PDF version of thesis.
Includes bibliographical references (pages 79-80).
The motion responses of unconventional Small Water-plane Area Twin Hull (SWATH) vessels are unique in the sense that viscosity has significant non-linear effects on their hydrodynamic parameters. The parametric optimization of the hull shape of these vessels to reduce the total resistance in waves yields an interesting hull form where viscous effects become significant and this kind of problem is generally more difficult to solve. This study aims to investigate the motion response of these special kind of ships in waves using both numerical and experimental approach with some theoretical simplifications to better understand the hydrodynamics of the ship. The two modes of motion of interest in this study are heave and pitch motions which were chosen in order to focus on the degrees of freedom which significantly contributes to the resistance of the ship in head waves. The vessel under investigation is an unmanned surface vessel (USV) proposed to be used to monitor a team of autonomous underwater vehicles. A scaled version of this model is built and some experiments were conducted at the MIT towing tank at zero speed. Additionally, the numerical methods are implemented using 2D and 3D potential flow solvers. As this is an ongoing project, the results obtained so far including the study of the effects of the inertial characteristics of the ship on the response amplitude operator (RAO) are presented.
by Abiodun Timothy Olaoye.
S.M.