subject:(vortex)

1. Hanson, Helen A. The Crystallography of Vortex Matter in a Niobium Crystal.

Degree: PhD, Physics, 2012, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:297704/

► The vortex matter in type-II superconductors continues to be a subject of great fascination in condensed matter physics. A longstanding theoretical and experimental problem is… (more)

▼ The vortex matter in type-II superconductors continues to be a subject of great fascination in condensed matter physics. A longstanding theoretical and experimental problem is the identification of the ground state of the vortex lines in the presence of quenched atomic disorder which acts as random pinning centers. A possible edge contamination model has been proposed as a mechanism behind the seemingly contradictory experimental results for the ordered state of matter. This model could also explain the lack of universality for the peak effect behavior exhibited in samples with otherwise similar phase diagrams. Using a novel neutron diffraction technique, we report structural evidence for this edge contamination mechanism. This high-resolution method is used to study the fine structure of the vortex matter in a niobium crystal with a weak peak effect and a disordered zero-field-cooled vortex matter. We find this disordered state is metastable and that it can be restructured through a thermal cycling procedure. The results are explained in a strained lattice framework. We then perform Reverse Monte Carlo Refinements on our neutron scattering data and the possible vortex structures for our crystal agree with experimental results from an approach that combines spatial information with reciprocal space scattering. Having confirmed the existence of an edge contamination mechanism in this sample, we oxidize the surface in order to reduce the impact of the inhomogeneous surface barrier. By repeating our neutron diffraction measurements, we find that oxidation process has smoothed the magnetic field profile through the sample and improves the overall structural order of the zero-field-cooled vortex matter. On the other hand, the field-cooled vortex matter structure should be independent of any edge contamination effect but surprisingly, this scattering intensity in fact doubles after surface oxidation. This result suggests that there is another source of disorder in the niobium crystal that has been affected. We discuss our results in the context of the peak effect and Bragg glass models. Advisors/Committee Members: Ling, Xinsheng (Director), Kosterlitz, James (Reader), Mitrovic, Vesna (Reader).

Subjects/Keywords: vortex phyiscs

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APA (6^th Edition):

Hanson, H. A. (2012). The Crystallography of Vortex Matter in a Niobium Crystal. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:297704/

Chicago Manual of Style (16^th Edition):

Hanson, Helen A. “The Crystallography of Vortex Matter in a Niobium Crystal.” 2012. Doctoral Dissertation, Brown University. Accessed April 21, 2021. https://repository.library.brown.edu/studio/item/bdr:297704/.

MLA Handbook (7^th Edition):

Hanson, Helen A. “The Crystallography of Vortex Matter in a Niobium Crystal.” 2012. Web. 21 Apr 2021.

Vancouver:

Hanson HA. The Crystallography of Vortex Matter in a Niobium Crystal. [Internet] [Doctoral dissertation]. Brown University; 2012. [cited 2021 Apr 21]. Available from: https://repository.library.brown.edu/studio/item/bdr:297704/.

Council of Science Editors:

Hanson HA. The Crystallography of Vortex Matter in a Niobium Crystal. [Doctoral Dissertation]. Brown University; 2012. Available from: https://repository.library.brown.edu/studio/item/bdr:297704/

Rutgers University

2. Pardeshi, Parikshit B., 1989-. Impact of centerline no-slip on vortex tube performance.

Degree: MS, Mechanical and Aerospace Engineering, 2016, Rutgers University

URL: https://rucore.libraries.rutgers.edu/rutgers-lib/49275/

► The Ranque-Hilsch vortex tube or simply the vortex tube is a device that separates a high pressure gas into a low pressure hot stream and… (more)

Subjects/Keywords: Vortex-motion

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APA (6^th Edition):

Pardeshi, Parikshit B., 1. (2016). Impact of centerline no-slip on vortex tube performance. (Masters Thesis). Rutgers University. Retrieved from https://rucore.libraries.rutgers.edu/rutgers-lib/49275/

Chicago Manual of Style (16^th Edition):

Pardeshi, Parikshit B., 1989-. “Impact of centerline no-slip on vortex tube performance.” 2016. Masters Thesis, Rutgers University. Accessed April 21, 2021. https://rucore.libraries.rutgers.edu/rutgers-lib/49275/.

MLA Handbook (7^th Edition):

Pardeshi, Parikshit B., 1989-. “Impact of centerline no-slip on vortex tube performance.” 2016. Web. 21 Apr 2021.

Vancouver:

Pardeshi, Parikshit B. 1. Impact of centerline no-slip on vortex tube performance. [Internet] [Masters thesis]. Rutgers University; 2016. [cited 2021 Apr 21]. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/49275/.

Council of Science Editors:

Pardeshi, Parikshit B. 1. Impact of centerline no-slip on vortex tube performance. [Masters Thesis]. Rutgers University; 2016. Available from: https://rucore.libraries.rutgers.edu/rutgers-lib/49275/

University of Oulu

3. Karimäki, J. (Janne). Structure and dynamics of vortices in superfluid helium-3.

Degree: 2012, University of Oulu

URL: http://urn.fi/urn:isbn:9789514297397

► Abstract In this thesis, the structure and the dynamics of vortices are studied from the standpoint of the hydrodynamical theory of superfluids. In the hydrodynamical… (more)

▼ Abstract In this thesis, the structure and the dynamics of vortices are studied from the standpoint of the hydrodynamical theory of superfluids. In the hydrodynamical theory a superfluid is described by a continuous order parameter field. In the case of superfluid helium-4 this field is a complex-valued function of position and time. However, in superfluid helium-3 the order parameter is a complex-valued 3 × 3 matrix. The first part of this work consists of studies on structures that appear in the order parameter field, when a vessel filled with superfluid helium-3 in the A phase (3He-A) is rotated in an external magnetic field. Among the most common of these structures are the so-called continuous vortices. They exist in several different forms. In addition to vortices, other possible structures include the vortex sheet of 3He-A that was discovered at the Low Temperature Laboratory of Helsinki University of Technology (currently Aalto University) in late 1993. In this thesis, these structures were studied by finding stationary vortex configurations that minimize the free energy of the superfluid. An algorithm for minimizing the free energy was implemented by writing a computer program. This program was then used to study the structure of a few vortex types, inferred to be the most probable ones. In addition, regular lattices formed by these vortices, including the vortex sheet, were studied. A phase diagram for vortex lattices was constructed by comparing the free energy of various lattice structures as a function of rotational velocity and external magnetic field. The study of vortex structures also lead to a discovery of a new type of vortex in 3He-A, later named the LV3 vortex. In the second part of the work, the dynamics of vortices was studied using a filament model of vortex motion, which also has its theoretical justification in the hydrodynamical model of superfluids, but where the detailed structure of the vortex core is not relevant. The specific problem under consideration here was the motion of a quantized vortex in a rotating elongated cylinder filled with superfluid, and how the motion of the vortex depends on temperature and the rotational velocity of the vessel. The study of vortex motion was simplified using scaling laws. A new type of scaling law was discovered, which both simplified the specific problem under study, and made the results more general. In summary, the research in this thesis touched upon two somewhat complementary areas, i.e. the structure of continuous vortices in 3He-A and the dynamics of thin vortex lines, which is more applicable to superfluid 4He or to the B phase of superfluid helium-3 (3He-B). However, these areas complement each other in advancing the general scientific understanding about the properties of superfluids.

Subjects/Keywords: Continuous Vortices; Superfluid; Vortex dynamics; Vortex lattices

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APA (6^th Edition):

Karimäki, J. (. (2012). Structure and dynamics of vortices in superfluid helium-3. (Doctoral Dissertation). University of Oulu. Retrieved from http://urn.fi/urn:isbn:9789514297397

Chicago Manual of Style (16^th Edition):

Karimäki, J (Janne). “Structure and dynamics of vortices in superfluid helium-3.” 2012. Doctoral Dissertation, University of Oulu. Accessed April 21, 2021. http://urn.fi/urn:isbn:9789514297397.

MLA Handbook (7^th Edition):

Karimäki, J (Janne). “Structure and dynamics of vortices in superfluid helium-3.” 2012. Web. 21 Apr 2021.

Vancouver:

Karimäki J(. Structure and dynamics of vortices in superfluid helium-3. [Internet] [Doctoral dissertation]. University of Oulu; 2012. [cited 2021 Apr 21]. Available from: http://urn.fi/urn:isbn:9789514297397.

Council of Science Editors:

Karimäki J(. Structure and dynamics of vortices in superfluid helium-3. [Doctoral Dissertation]. University of Oulu; 2012. Available from: http://urn.fi/urn:isbn:9789514297397

Penn State University

4. Mills, Shaun Alan. Superconductivity and vortex dynamics in nanostructures of two-dimensional crystals of niobium diselenide.

Degree: 2016, Penn State University

URL: https://submit-etda.libraries.psu.edu/catalog/zc77sq08x

► The confinement offered by superconducting nanostructures enables the study of the motion of individual Abrikosov vortices in reduced dimensions. At the present time, most superconducting… (more)

▼ The confinement offered by superconducting nanostructures enables the study of the motion of individual Abrikosov vortices in reduced dimensions. At the present time, most superconducting nanostructures are fabricated from deposited films of metals, which are often polycrystalline or amorphous. The realization of a single-crystal nanostructure would provide the opportunity to explore the effects of the electronic band structure. Consider crystalline superconducting nanostructures of NbSe2. Questions such as the how the charge density wave order influences vortex pinning and the logarithmic vortex-vortex interaction, as well as how the crystal thickness dependence of the electronic band structure affects intrinsic vortex properties motivated our efforts to develop techniques to fabricate and measure superconducting nanostructures of 2D crystal NbSe2. Additionally, nanoscale transport devices are relevant to potential future superconducting electronics. In this dissertation, we begin by presenting a novel technique for the preparation of single-crystal nanostructures prepared from mechanically exfoliated few-layer crystals of NbSe2 using a process combining electron beam lithography and reactive plasma etching. Our technique allows for the preparation of ultra-thin, single-crystal superconducting nanostructures with a desired geometry for the study of vortex dynamics in extremely confined systems. A primary advantage of transport devices is the ability to directly manipulate individual vortices through the use of an applied current and other parameters. We first present magnetoresistance measurements on NbSe2 nanowires and show features related to vortex crossing, trapping, and pinning. The vortex crossing rate is found to vary non-monotonically with the applied field, which results in non-monotonic magnetoresistance variations in agreement with theoretical calculations in the London approximation. Above the lower critical field, Hc1, the crossing rate is also influenced by vortices trapped by sample boundaries or pinning centers, leading to sample-specific magnetoresistance patterns. We show that the local pinning potential can be modified by intentionally introducing surface adsorbates, making the magnetoresistance pattern a "magneto fingerprint" of the sample-specific configuration of vortex pinning centers in a superconducting nanowire. Building upon our work on NbSe2 nanowires, we next focus on NbSe2 nanoloops. The doubly-connected topology of nanoloops presents a unique opportunity for the manipulation of Abrikosov vortices; numerical calculations in the London limit suggest that an Abrikosov vortex can be trapped in a nanoloop above a critical magnetic field and generate a phase shift in the magnetoresistance oscillations. We measure magnetoresistance oscillations resulting from vortex crossing events in NbSe2 nanoloops and demonstrate experimentally that the crossing of vortices can be directed at a pair of constrictions in the loop, leading to more pronounced magnetoresistance oscillations than those in a… Advisors/Committee Members: Ying Liu, Dissertation Advisor/Co-Advisor.

Subjects/Keywords: superconductivity; nanostructures; vortex dynamics; Abrikosov vortex

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APA (6^th Edition):

Mills, S. A. (2016). Superconductivity and vortex dynamics in nanostructures of two-dimensional crystals of niobium diselenide. (Thesis). Penn State University. Retrieved from https://submit-etda.libraries.psu.edu/catalog/zc77sq08x

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Mills, Shaun Alan. “Superconductivity and vortex dynamics in nanostructures of two-dimensional crystals of niobium diselenide.” 2016. Thesis, Penn State University. Accessed April 21, 2021. https://submit-etda.libraries.psu.edu/catalog/zc77sq08x.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Mills, Shaun Alan. “Superconductivity and vortex dynamics in nanostructures of two-dimensional crystals of niobium diselenide.” 2016. Web. 21 Apr 2021.

Vancouver:

Mills SA. Superconductivity and vortex dynamics in nanostructures of two-dimensional crystals of niobium diselenide. [Internet] [Thesis]. Penn State University; 2016. [cited 2021 Apr 21]. Available from: https://submit-etda.libraries.psu.edu/catalog/zc77sq08x.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Mills SA. Superconductivity and vortex dynamics in nanostructures of two-dimensional crystals of niobium diselenide. [Thesis]. Penn State University; 2016. Available from: https://submit-etda.libraries.psu.edu/catalog/zc77sq08x

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Texas – Austin

5. Stephenson, James Harold. Experimental investigation of the far-field rotorcraft wake structure.

Degree: MSin Engineering, Aerospace Engineering, 2012, University of Texas – Austin

URL: http://hdl.handle.net/2152/ETD-UT-2012-05-5556

► The tumbling tip vortex effect of a reduced-scale, 1 m diameter, four-bladed rotor during hover is studied using vortex methods, combined with a center of… (more)

Subjects/Keywords: Vortex; Tumbling; Rotorcraft; Rotor wake; Vortex coalescence

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APA (6^th Edition):

Stephenson, J. H. (2012). Experimental investigation of the far-field rotorcraft wake structure. (Masters Thesis). University of Texas – Austin. Retrieved from http://hdl.handle.net/2152/ETD-UT-2012-05-5556

Chicago Manual of Style (16^th Edition):

Stephenson, James Harold. “Experimental investigation of the far-field rotorcraft wake structure.” 2012. Masters Thesis, University of Texas – Austin. Accessed April 21, 2021. http://hdl.handle.net/2152/ETD-UT-2012-05-5556.

MLA Handbook (7^th Edition):

Stephenson, James Harold. “Experimental investigation of the far-field rotorcraft wake structure.” 2012. Web. 21 Apr 2021.

Vancouver:

Stephenson JH. Experimental investigation of the far-field rotorcraft wake structure. [Internet] [Masters thesis]. University of Texas – Austin; 2012. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5556.

Council of Science Editors:

Stephenson JH. Experimental investigation of the far-field rotorcraft wake structure. [Masters Thesis]. University of Texas – Austin; 2012. Available from: http://hdl.handle.net/2152/ETD-UT-2012-05-5556

Oklahoma State University

6. Khandekar, Akshay Girish. Dynamics of Quasi 2d Co-rotating Vortex Merger.

Degree: Mechanical Engineering, 2014, Oklahoma State University

URL: http://hdl.handle.net/11244/14932

► Merger of vortices is examined experimentally to compare the merger of slender parallel vortices generated coincidentally. It is known that like-sign vortices rotate around a… (more)

Subjects/Keywords: 2d merger; piv; vortex dynamics; vortex merger

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APA (6^th Edition):

Khandekar, A. G. (2014). Dynamics of Quasi 2d Co-rotating Vortex Merger. (Thesis). Oklahoma State University. Retrieved from http://hdl.handle.net/11244/14932

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Khandekar, Akshay Girish. “Dynamics of Quasi 2d Co-rotating Vortex Merger.” 2014. Thesis, Oklahoma State University. Accessed April 21, 2021. http://hdl.handle.net/11244/14932.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Khandekar, Akshay Girish. “Dynamics of Quasi 2d Co-rotating Vortex Merger.” 2014. Web. 21 Apr 2021.

Vancouver:

Khandekar AG. Dynamics of Quasi 2d Co-rotating Vortex Merger. [Internet] [Thesis]. Oklahoma State University; 2014. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/11244/14932.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Khandekar AG. Dynamics of Quasi 2d Co-rotating Vortex Merger. [Thesis]. Oklahoma State University; 2014. Available from: http://hdl.handle.net/11244/14932

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

7. Bryant, Duncan Burnette. Coherent Structures in Turbulent Flows: Experimental Studies on the Turbulence of Multiphase Plumes and Tidal Vortices.

Degree: PhD, Ocean Engineering, 2011, Texas A&M University

URL: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7893

► This dissertation presents the turbulence of multiphase plumes and tidal vortices by studying and quantifying coherent structures that affect the dynamics of the flow. The… (more)

▼ This dissertation presents the turbulence of multiphase plumes and tidal vortices by studying and quantifying coherent structures that affect the dynamics of the flow. The measurements presented in this dissertation were taken using particle image velocimetry (PIV). After preprocessing the images and conducting the PIV analysis to get the final velocity fields, the local swirl strength was used to identify coherent structures (vortices) in the flow. This dissertation used the identified vortices to quantify the turbulent properties of the flows. The mean and turbulent properties of bubble plumes are found to be self-similar within the measured air flow rates when appropriately nondimensionalized. The timeaveraged velocity profile was shown to have a Gaussian distribution when nondimensionalized by the centerline velocity and plume radius. The bubble plumes were found to have the most energetic vortices along the plume edge and a modulated turbulent energy spectrum with a slope in the inertial subrange from -7/6 instead of the classical -5/3. The mean and turbulent properties of an inertial particle plume are presented, revealing the time-averaged velocity and vorticity profiles to be self-similar for all cases when nondimesionalized by the centerline velocity and plume radius. The average vortex properties were not self-similar for all flow cases with the largest two particles sizes being self-similar and the smallest particle vortex properties being similar to bubble plume data. Despite the difference in vortex properties, the turbulent energy spectra in inertial particle plumes followed the same modulation as the bubble plumes. PIV experiments from the tidal starting-jet vortices detail the influence of a finite channel length using identified vortice. The results show the trajectory and development of the tidal starting-jet vortices to be changed by a region of vorticity that develops inside the channel and is expelled as a vortex during the ebb tide. This expelled lateral boundary layer vortex is shown to move the starting-jet vortex away from the tidal jet shear layer thus reducing the input vorticity. When the expelled boundary layer vortex strength is 1/5 the starting-jet vortex the system dynamics change resulting in a deviation in the starting-jet vortices' trajectory. This dissertation successfully uses the local swirl strength to quantify the turbulence of multiphase plumes and tidal starting-jet vortices. Using these results, engineers will be able to better predict the efficiency of CO2 ocean sequestration and tidal flushing. Furthermore, the techniques of quantifying coherent structures developed in this dissertation can be applied to a multitude of turbulent flows. Advisors/Committee Members: Socolofsky, Scott A. (advisor), Hassan, Yassin A. (committee member), Kaihatu, James (committee member), Chang, Kuang-An (committee member).

Subjects/Keywords: Plumes; Vortex; Tides

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bryant, D. B. (2011). Coherent Structures in Turbulent Flows: Experimental Studies on the Turbulence of Multiphase Plumes and Tidal Vortices. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7893

Chicago Manual of Style (16^th Edition):

Bryant, Duncan Burnette. “Coherent Structures in Turbulent Flows: Experimental Studies on the Turbulence of Multiphase Plumes and Tidal Vortices.” 2011. Doctoral Dissertation, Texas A&M University. Accessed April 21, 2021. http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7893.

MLA Handbook (7^th Edition):

Bryant, Duncan Burnette. “Coherent Structures in Turbulent Flows: Experimental Studies on the Turbulence of Multiphase Plumes and Tidal Vortices.” 2011. Web. 21 Apr 2021.

Vancouver:

Bryant DB. Coherent Structures in Turbulent Flows: Experimental Studies on the Turbulence of Multiphase Plumes and Tidal Vortices. [Internet] [Doctoral dissertation]. Texas A&M University; 2011. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7893.

Council of Science Editors:

Bryant DB. Coherent Structures in Turbulent Flows: Experimental Studies on the Turbulence of Multiphase Plumes and Tidal Vortices. [Doctoral Dissertation]. Texas A&M University; 2011. Available from: http://hdl.handle.net/1969.1/ETD-TAMU-2010-05-7893

8. Onoue, Kyohei. Characterization of the leading-edge vortex dynamics using cyber-physical systems.

Degree: PhD, Fluids and Thermal Sciences, 2016, Brown University

URL: https://repository.library.brown.edu/studio/item/bdr:674286/

► We present experimental investigations aimed at characterizing the flow physics associated with strong fluid-structure interactions that drive large-scale oscillations of an elastically-supported wing in a… (more)

▼ We present experimental investigations aimed at characterizing the flow physics associated with strong fluid-structure interactions that drive large-scale oscillations of an elastically-supported wing in a uniform airflow. All experiments are performed using a cyber-physical system in which the structural characteristics of the system are emulated using a digital controller that monitors the motion of the structure in real time. Provided that the formation of the leading-edge vortex (LEV) plays an important role in driving large-scale oscillations, much of our effort has been devoted into characterizing the dynamical properties of the LEV. Towards this end, we first analyzed the phase-plane representation of the aeroelastic instability to follow and deduce from the measured motion and aerodynamic torque the formation time and separation dynamics of the LEV. The insight gained from the phase portraits are subsequently confirmed and directly quantified using 2D Particle Image Velocimetry (PIV). We demonstrate that the LEV stability, formation time and circulation scale robustly with the characteristic velocity of the feeding shear layer emanating from the leading edge, and the connection between this scaling and the concept of optimal vortex formation number is discussed. We developed a quasi-steady potential flow model to elucidate a quantitative connection between the location and strength of the LEV core and the resulting aerodynamic torque on the elastic structure. In the final phase of this work, we implemented tomographic PIV to characterize the three-dimensionality of the LEV core on 2D and 3D wings, and to identify important vorticity transport mechanisms responsible for regulating the LEV growth. Through systematic assessments of vortex stability, three-dimensional vorticity dynamics and vortex energy, we found that the stability of the LEV can be improved by (i) increasing the reduced frequency, (ii) moderating the LEV circulation via the process of vorticity annihilation and (iii) suppressing the formation of an arch-shaped LEV. We conclude this study by presenting a unified scaling for vortex formation on 2D and 3D pitching wings that effectively accounts for the variations in the physical configuration of the vortex generator, wing kinematics and Reynolds number. Advisors/Committee Members: Breuer, Kenneth (Director), Mandre, Shreyas (Reader), Franck, Jennifer (Reader).

Subjects/Keywords: Leading-edge vortex

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APA (6^th Edition):

Onoue, K. (2016). Characterization of the leading-edge vortex dynamics using cyber-physical systems. (Doctoral Dissertation). Brown University. Retrieved from https://repository.library.brown.edu/studio/item/bdr:674286/

Chicago Manual of Style (16^th Edition):

Onoue, Kyohei. “Characterization of the leading-edge vortex dynamics using cyber-physical systems.” 2016. Doctoral Dissertation, Brown University. Accessed April 21, 2021. https://repository.library.brown.edu/studio/item/bdr:674286/.

MLA Handbook (7^th Edition):

Onoue, Kyohei. “Characterization of the leading-edge vortex dynamics using cyber-physical systems.” 2016. Web. 21 Apr 2021.

Vancouver:

Onoue K. Characterization of the leading-edge vortex dynamics using cyber-physical systems. [Internet] [Doctoral dissertation]. Brown University; 2016. [cited 2021 Apr 21]. Available from: https://repository.library.brown.edu/studio/item/bdr:674286/.

Council of Science Editors:

Onoue K. Characterization of the leading-edge vortex dynamics using cyber-physical systems. [Doctoral Dissertation]. Brown University; 2016. Available from: https://repository.library.brown.edu/studio/item/bdr:674286/

9. Träsch, Martin. Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante : Experimental and numerical characterization of the dynamic behavior of an undulating membrane tidal energy converter.

Degree: Docteur es, Mécanique des milieux fluides, 2019, Université Lille I – Sciences et Technologies

URL: http://www.theses.fr/2019LIL1I009

►

La thèse présentée dans ce document concerne la caractérisation du comportement d’une hydrolienne à membrane ondulante. Ce dispositif novateur utilise les instabilités de flottement d’une… (more)

▼

La thèse présentée dans ce document concerne la caractérisation du comportement d’une hydrolienne à membrane ondulante. Ce dispositif novateur utilise les instabilités de flottement d’une membrane semi-rigide précontrainte dans un écoulement pour capter l’énergie des courants marins. À partir d’une certaine vitesse critique de l’écoulement, une onde se propage le long de la structure, ce qui actionne des convertisseurs linéaires fixés sur celle-ci. Un modèle expérimental à échelle réduite 1/20eme est développé et testé en bassin d’essai. Le système de conversion est simulé par des amortisseurs hydrauliques. Les mesures de trajectoire et d’efforts permettent d’analyser la dynamique de la membrane pour un grand nombre de configurations et d’aboutir à une étude paramétrique. Des conditions réalistes d’écoulement sont étudiées, notamment l’influence de la direction du courant et celle de la houle sur le fonctionnement du système. La caractérisation du sillage est effectuée par mesures de vélocimétrie laser en 2D. Les effets d’échelle sont présentés à travers une comparaison des essais en bassin et en mer. Un modèle analytique et un modèle numérique sont développés et comparés avec les résultats d’expériences. Le modèle analytique linéaire est basé sur la théorie des poutres de Euler-Bernouilli et la théorie des profils minces de Lighthill. Il est résolu dans le domaine fréquentiel et donne de bons résultats en termes de fréquence d’ondulation et de vitesse critique. Le modèle numérique est fondé sur le couplage fort entre un code fluide basé sur la méthode vortex et un code structure utilisant les éléments finis en corotationnel. Ce modèle est validé sur un cas expérimental.

The thesis presented in this document deals with the characterization of the behavior of an undulating membrane tidal energy converter. This kind of device uses the flutter instabilities occurring between a semi-rigid pre-strained membrane and a fluid flow in order to convert the sea currents energy. Above a certain critical flow speed, the structure undulates, thus activating the linear converters fixed on it. In order to study this system, an experimental model is developed and tested in a flume tank. The power conversion system is simulated by hydraulic dampers. The membrane’s dynamics is analyzed in many configurations through trajectory and force measurements, and leads to a parametric study. More realistic flow conditions are also studied, such as the impact of current direction influence and the influence of surface waves on the behavior of the system. Wake characterization is carried out with two-dimensional PIV measurements. Scale effects and confinement are also studied through a comparison with a bigger scale prototype tested in tank and at sea.In addition to the experimental study, an analytical model and a numerical model are developed and compared with experiments. The linear analytical model is based on Euler-Bernouilli’s beam theory and on Lighthill’s slender body theory. It is solved in the frequency domain and gives good…

Advisors/Committee Members: Germain, Grégory (thesis director).

Subjects/Keywords: Méthode vortex; 620.106

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APA (6^th Edition):

Träsch, M. (2019). Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante : Experimental and numerical characterization of the dynamic behavior of an undulating membrane tidal energy converter. (Doctoral Dissertation). Université Lille I – Sciences et Technologies. Retrieved from http://www.theses.fr/2019LIL1I009

Chicago Manual of Style (16^th Edition):

Träsch, Martin. “Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante : Experimental and numerical characterization of the dynamic behavior of an undulating membrane tidal energy converter.” 2019. Doctoral Dissertation, Université Lille I – Sciences et Technologies. Accessed April 21, 2021. http://www.theses.fr/2019LIL1I009.

MLA Handbook (7^th Edition):

Träsch, Martin. “Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante : Experimental and numerical characterization of the dynamic behavior of an undulating membrane tidal energy converter.” 2019. Web. 21 Apr 2021.

Vancouver:

Träsch M. Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante : Experimental and numerical characterization of the dynamic behavior of an undulating membrane tidal energy converter. [Internet] [Doctoral dissertation]. Université Lille I – Sciences et Technologies; 2019. [cited 2021 Apr 21]. Available from: http://www.theses.fr/2019LIL1I009.

Council of Science Editors:

Träsch M. Caractérisation expérimentale et numérique du comportement hydrodynamique d’une hydrolienne à membrane ondulante : Experimental and numerical characterization of the dynamic behavior of an undulating membrane tidal energy converter. [Doctoral Dissertation]. Université Lille I – Sciences et Technologies; 2019. Available from: http://www.theses.fr/2019LIL1I009

Université Catholique de Louvain

10. Hallet, Xavier. Vortex pinning in superconducting thin films using ordered nanoporous templates.

Degree: 2012, Université Catholique de Louvain

URL: http://hdl.handle.net/2078.1/109680

►

The vortex motion in type-II superconductors strongly limits their critical current. Currently, ordered arrays of pinning centers in the superconductor are fabricated by lithographic process,… (more)

Subjects/Keywords: Superconductivity; Vortex; Matching

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APA (6^th Edition):

Hallet, X. (2012). Vortex pinning in superconducting thin films using ordered nanoporous templates. (Thesis). Université Catholique de Louvain. Retrieved from http://hdl.handle.net/2078.1/109680

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Hallet, Xavier. “Vortex pinning in superconducting thin films using ordered nanoporous templates.” 2012. Thesis, Université Catholique de Louvain. Accessed April 21, 2021. http://hdl.handle.net/2078.1/109680.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Hallet, Xavier. “Vortex pinning in superconducting thin films using ordered nanoporous templates.” 2012. Web. 21 Apr 2021.

Vancouver:

Hallet X. Vortex pinning in superconducting thin films using ordered nanoporous templates. [Internet] [Thesis]. Université Catholique de Louvain; 2012. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/2078.1/109680.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Hallet X. Vortex pinning in superconducting thin films using ordered nanoporous templates. [Thesis]. Université Catholique de Louvain; 2012. Available from: http://hdl.handle.net/2078.1/109680

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

11. Manjunath, Pranav (author). Computational Study of the Dynamics of the Flow-Field Induced by Vortex Generators.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:9f865967-616a-4f5b-a866-b453c8b7f2f5

► Vortex Generators (VGs) are one of the most commonly used passive flow control devices. Recent studies have shown that it is beneficial to use sub-boundary… (more)

Subjects/Keywords: Vortex generators; Windenergy

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APA (6^th Edition):

Manjunath, P. (. (2017). Computational Study of the Dynamics of the Flow-Field Induced by Vortex Generators. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:9f865967-616a-4f5b-a866-b453c8b7f2f5

Chicago Manual of Style (16^th Edition):

Manjunath, Pranav (author). “Computational Study of the Dynamics of the Flow-Field Induced by Vortex Generators.” 2017. Masters Thesis, Delft University of Technology. Accessed April 21, 2021. http://resolver.tudelft.nl/uuid:9f865967-616a-4f5b-a866-b453c8b7f2f5.

MLA Handbook (7^th Edition):

Manjunath, Pranav (author). “Computational Study of the Dynamics of the Flow-Field Induced by Vortex Generators.” 2017. Web. 21 Apr 2021.

Vancouver:

Manjunath P(. Computational Study of the Dynamics of the Flow-Field Induced by Vortex Generators. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 21]. Available from: http://resolver.tudelft.nl/uuid:9f865967-616a-4f5b-a866-b453c8b7f2f5.

Council of Science Editors:

Manjunath P(. Computational Study of the Dynamics of the Flow-Field Induced by Vortex Generators. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:9f865967-616a-4f5b-a866-b453c8b7f2f5

Delft University of Technology

12. Zhou, T. (author). Orthogonal Vortex-Propeller Interaction: Vortex Response and Impact on the Propeller Performance.

Degree: 2015, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:8c8b0678-519d-4480-825d-69d215ae48c3

►

In some situations, concentrated vorticity which forms a vortical flow is involved in the inflow of a propeller. The impingement of the vortex on the… (more)

▼

In some situations, concentrated vorticity which forms a vortical flow is involved in the inflow of a propeller. The impingement of the vortex on the propeller has several detrimental effects, e.g., foreign object damage during ground operation, impact on the propeller performance, unsteady loading on the blade, and tonal noise generation. The research presented in this report is conducted for the concern of the effects of the interaction between inflow vortex and propeller, in terms of vortex response to the propeller and vortex impact on the aerodynamic performance of the propeller. The impact of impinging vortex on the propeller is studied by experimental and numerical methods. The variation of the propeller performance caused by the impingement of vortex is dependent on the relatively rotational direction of the vortex and the propeller. For the counter-rotating case, the thrust and torque coefficients are increased by the vortex impingement; and vice versa for the co-rotating case. The variations of the thrust and torque coefficients are proportional to the vortex strength. And it becomes more significant as the radial impingement position moves inwards and the advance ratio increases. However, the impingement of vortex does not evidently affects the efficiency of the propeller. The response of vortex to the propeller is investigated by PIV measurement. The variation of vortex behaviors is dependent on the phase angle of the propeller blade. At the phase angles when the wake of the blade is away from the impinging vortex, the vortex core circulation is independent from the impact of propeller. Due to the contraction of the stream tube caused by the propeller suction, the vortex core radius observed in the measurement plane downstream the propeller is smaller than that in the flow field upstream, and the magnitude of vortex vorticity and the maximum tangential velocity becomes larger. At the phase angle when the vortex core coincides with the propeller blade wake vortices, characteristics of the impinging vortex are dependent on the sign of the vorticity of the impinging vortex and the blade wake. For the case that the impinging vortex and the blade wake have the opposite sign of vorticity, the impinging vortex and the blade wake break each other into fractions with smaller core radius and circulation; for the case with the same sign of vorticity, they merge together, forming a new pattern with higher magnitude of vorticity.

Aerodynamics, Wind Energy, Flight Performance and Propulsion

Aerospace Engineering

Advisors/Committee Members: Eitelberg, G. (mentor), Yang, Y. (mentor).

Subjects/Keywords: vortex; propeller; interaction

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APA (6^th Edition):

Zhou, T. (. (2015). Orthogonal Vortex-Propeller Interaction: Vortex Response and Impact on the Propeller Performance. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8c8b0678-519d-4480-825d-69d215ae48c3

Chicago Manual of Style (16^th Edition):

Zhou, T (author). “Orthogonal Vortex-Propeller Interaction: Vortex Response and Impact on the Propeller Performance.” 2015. Masters Thesis, Delft University of Technology. Accessed April 21, 2021. http://resolver.tudelft.nl/uuid:8c8b0678-519d-4480-825d-69d215ae48c3.

MLA Handbook (7^th Edition):

Zhou, T (author). “Orthogonal Vortex-Propeller Interaction: Vortex Response and Impact on the Propeller Performance.” 2015. Web. 21 Apr 2021.

Vancouver:

Zhou T(. Orthogonal Vortex-Propeller Interaction: Vortex Response and Impact on the Propeller Performance. [Internet] [Masters thesis]. Delft University of Technology; 2015. [cited 2021 Apr 21]. Available from: http://resolver.tudelft.nl/uuid:8c8b0678-519d-4480-825d-69d215ae48c3.

Council of Science Editors:

Zhou T(. Orthogonal Vortex-Propeller Interaction: Vortex Response and Impact on the Propeller Performance. [Masters Thesis]. Delft University of Technology; 2015. Available from: http://resolver.tudelft.nl/uuid:8c8b0678-519d-4480-825d-69d215ae48c3

Victoria University of Wellington

13. Cameron, Christopher. Characterisation of the Antarctic stratospheric vortex mixing barrier.

Degree: 2019, Victoria University of Wellington

URL: http://hdl.handle.net/10063/8583

► The strongest stratospheric circulation in the Southern Hemisphere is the Antarctic Circumpolar Vortex (ACV) which forms each winter and spring as a zone of westerly… (more)

▼ The strongest stratospheric circulation in the Southern Hemisphere is the Antarctic Circumpolar Vortex (ACV) which forms each winter and spring as a zone of westerly winds surrounding Antarctica, presenting a barrier to transport of air masses between middle and high-latitudes. This barrier contributes to stratospheric temperatures above the polar region dropping sufficiently low in spring to allow for the processes leading to ozone destruction. Unfortunately, the ACV is generally not well simulated in Global Climate Models (GCMs), and this presents a challenge for model accuracy and projections in the face of a changing climate and a recovering ozone hole. In this research, an assessment is made of the performance of a range of mixing metrics in representing the ACV based on reanalyses, including: Effective Diffusivity, Contour Crossing, the Lagrangian function M, and Meridional Impermeability. It is shown that Meridional Impermeability – which provides a measure of the strength of the meridional mixing barrier as a function of potential vorticity (PV) gradient and wind-speed – acts as a useful proxy for more complex metrics. In addition, Meridional Impermeability displays a well-defined vortex profile across equivalent latitude, which is not seen to the same degree in the other metrics assessed. Representation of the ACV is further compared between climate models and reanalyses based on Meridional Impermeability. It is shown that while climate models have improved in their representation of the vortex barrier over time, there are still significant discrepancies between models and reanalyses. One cause of these discrepancies may result from the use of prescribed ozone fields rather than interactive ozone chemistry. This is further examined by comparing Chemistry Climate Model (CCM) simulations using interactive ozone chemistry, with those using prescribed ozone at either 3-D (i.e., height, latitude and longitude) or 2-D (i.e., height, latitude) dimensionality. Considerable improvement in the representation of the ACV can be achieved by shifting from 2-D to 3-D prescribed ozone fields, and interactive ozone chemistry further improves its representation. However, discrepancies in model representation of the ACV still remain. Previous researchers have also attributed discrepancies in model representation of the polar vortices to the model resolution, and the parameterization of gravity waves at the sub-grid scale – these factors are considered to contribute to the discrepancies found in simulations undertaken here also. The results of this research are expected to provide guidance to improve the representation of vortex processes in climate modelling. Advisors/Committee Members: Renwick, James, Bodeker, Greg.

Subjects/Keywords: Climate; Vortex; Stratosphere

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APA (6^th Edition):

Cameron, C. (2019). Characterisation of the Antarctic stratospheric vortex mixing barrier. (Doctoral Dissertation). Victoria University of Wellington. Retrieved from http://hdl.handle.net/10063/8583

Chicago Manual of Style (16^th Edition):

Cameron, Christopher. “Characterisation of the Antarctic stratospheric vortex mixing barrier.” 2019. Doctoral Dissertation, Victoria University of Wellington. Accessed April 21, 2021. http://hdl.handle.net/10063/8583.

MLA Handbook (7^th Edition):

Cameron, Christopher. “Characterisation of the Antarctic stratospheric vortex mixing barrier.” 2019. Web. 21 Apr 2021.

Vancouver:

Cameron C. Characterisation of the Antarctic stratospheric vortex mixing barrier. [Internet] [Doctoral dissertation]. Victoria University of Wellington; 2019. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/10063/8583.

Council of Science Editors:

Cameron C. Characterisation of the Antarctic stratospheric vortex mixing barrier. [Doctoral Dissertation]. Victoria University of Wellington; 2019. Available from: http://hdl.handle.net/10063/8583

Florida Atlantic University

14. Stankovic, Radivoje. On the Drainage Vortices of Liquid in a Container with Two Outlets.

Degree: MS, 2020, Florida Atlantic University

URL: http://fau.digital.flvc.org/islandora/object/fau:44458

►

When a liquid drains through a hole in a container, a vortex may form between the surface and the drainage hole. An interesting phenomenon occurs… (more)

Subjects/Keywords: Drainage; Vortex-motion

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APA (6^th Edition):

Stankovic, R. (2020). On the Drainage Vortices of Liquid in a Container with Two Outlets. (Masters Thesis). Florida Atlantic University. Retrieved from http://fau.digital.flvc.org/islandora/object/fau:44458

Chicago Manual of Style (16^th Edition):

Stankovic, Radivoje. “On the Drainage Vortices of Liquid in a Container with Two Outlets.” 2020. Masters Thesis, Florida Atlantic University. Accessed April 21, 2021. http://fau.digital.flvc.org/islandora/object/fau:44458.

MLA Handbook (7^th Edition):

Stankovic, Radivoje. “On the Drainage Vortices of Liquid in a Container with Two Outlets.” 2020. Web. 21 Apr 2021.

Vancouver:

Stankovic R. On the Drainage Vortices of Liquid in a Container with Two Outlets. [Internet] [Masters thesis]. Florida Atlantic University; 2020. [cited 2021 Apr 21]. Available from: http://fau.digital.flvc.org/islandora/object/fau:44458.

Council of Science Editors:

Stankovic R. On the Drainage Vortices of Liquid in a Container with Two Outlets. [Masters Thesis]. Florida Atlantic University; 2020. Available from: http://fau.digital.flvc.org/islandora/object/fau:44458

University of Illinois – Urbana-Champaign

15. Olenek, Christopher W. Study of reduced order models for vortex-induced vibration and comparison with CFD results.

Degree: MS, 0133, 2011, University of Illinois – Urbana-Champaign

URL: http://hdl.handle.net/2142/24022

► Vortex-induced vibration (VIV) is a dynamic phenomenon that can occur when there is fluid flow past a bluff body with flexibility. Over time, VIV can… (more)

Subjects/Keywords: vortex-induced vibration

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APA (6^th Edition):

Olenek, C. W. (2011). Study of reduced order models for vortex-induced vibration and comparison with CFD results. (Thesis). University of Illinois – Urbana-Champaign. Retrieved from http://hdl.handle.net/2142/24022

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Olenek, Christopher W. “Study of reduced order models for vortex-induced vibration and comparison with CFD results.” 2011. Thesis, University of Illinois – Urbana-Champaign. Accessed April 21, 2021. http://hdl.handle.net/2142/24022.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Olenek, Christopher W. “Study of reduced order models for vortex-induced vibration and comparison with CFD results.” 2011. Web. 21 Apr 2021.

Vancouver:

Olenek CW. Study of reduced order models for vortex-induced vibration and comparison with CFD results. [Internet] [Thesis]. University of Illinois – Urbana-Champaign; 2011. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/2142/24022.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Olenek CW. Study of reduced order models for vortex-induced vibration and comparison with CFD results. [Thesis]. University of Illinois – Urbana-Champaign; 2011. Available from: http://hdl.handle.net/2142/24022

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Delft University of Technology

16. Sanders, Carsten (author). Controlled ring vortex injection into a turbulent pipe flow.

Degree: 2017, Delft University of Technology

URL: http://resolver.tudelft.nl/uuid:8bded4f1-6195-4903-a7ae-b4bffc6fde9b

► In this thesis a vortex generator is presented, that can generate controlled ring-vortex injections into a pipe flow. The performance of the generator and the… (more)

Subjects/Keywords: Vortex generators; Stereoscopic; pipe flow; PIV; Ring vortex; Hairpin vortex

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APA (6^th Edition):

Sanders, C. (. (2017). Controlled ring vortex injection into a turbulent pipe flow. (Masters Thesis). Delft University of Technology. Retrieved from http://resolver.tudelft.nl/uuid:8bded4f1-6195-4903-a7ae-b4bffc6fde9b

Chicago Manual of Style (16^th Edition):

Sanders, Carsten (author). “Controlled ring vortex injection into a turbulent pipe flow.” 2017. Masters Thesis, Delft University of Technology. Accessed April 21, 2021. http://resolver.tudelft.nl/uuid:8bded4f1-6195-4903-a7ae-b4bffc6fde9b.

MLA Handbook (7^th Edition):

Sanders, Carsten (author). “Controlled ring vortex injection into a turbulent pipe flow.” 2017. Web. 21 Apr 2021.

Vancouver:

Sanders C(. Controlled ring vortex injection into a turbulent pipe flow. [Internet] [Masters thesis]. Delft University of Technology; 2017. [cited 2021 Apr 21]. Available from: http://resolver.tudelft.nl/uuid:8bded4f1-6195-4903-a7ae-b4bffc6fde9b.

Council of Science Editors:

Sanders C(. Controlled ring vortex injection into a turbulent pipe flow. [Masters Thesis]. Delft University of Technology; 2017. Available from: http://resolver.tudelft.nl/uuid:8bded4f1-6195-4903-a7ae-b4bffc6fde9b

University of New South Wales

17. Torbaty, Mohammadali. Development of a vortex risk index for use with single-phase computational fluid dynamics in the simulation of intake structures.

Degree: Civil & Environmental Engineering, 2019, University of New South Wales

URL: http://handle.unsw.edu.au/1959.4/62455 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58623/SOURCE02?view=true

► A new method is developed for assessing the risk of undesirable vortex formation at pump intakes. The method addresses industry demand for a vortex classification… (more)

▼ A new method is developed for assessing the risk of undesirable vortex formation at pump intakes. The method addresses industry demand for a vortex classification system inferred from CFD modelling results. A new vortex risk index is the key result of this research; the numerical value of the index is equivalent to the vortex classification in ANSI/HI-9.8 (2012) standard for interpretation of results of physical modelling test results. The main difference between the present and preceding research is that instead of validating a CFD model that simulates a vortex with some level of accuracy, the focus is on:(i) finding metrics that distinguish acceptable from unacceptable vortices in single-phase CFD models; and(ii) proposing a generalised model setup for intake CFD modelling across different industrial scales.This research was conducted in four parts: • 42 laboratory experiments were conducted to produce all 6 vortex types identified in ANSI/HI-9.8 (2012); • a new two-phase CFD model of air-core vortices was developed, however the computational demands and time to obtain an unsteady solution, render it impractical for current engineering practice,• 42 single-phase CFD models were run to simulate the experimental tests; and • laboratory results, two sets of external prototype data, and CFD results were processed and a new vortex risk index (To) produced for CFD modelling results.The main research results were:• from the physical experiments, a new scaled submergence Froude number (FSS) was produced indicating that when FSS > 0.13 an air-core vortex will form, but no major vortex expected when FSS < 0.084.• Since any remedial measures not involving a change in submergence do not produce a change in FSS, a parameter capable of detecting the change is required, and from single-phase CFD modelling results, a new vortex risk index (To) is developed and shown to correlate strongly with vortex strength and type. Three different risk zones for the formation of vortices are defined based on To, to assess the vortices observed in CFD modelling. If To <1.27 there is a low risk of vortex formation, but if To >3.45 then the risk of vortex formation is high, and anti-vortex measures need to be implemented. Advisors/Committee Members: Cathers, Bruce, Civil & Environmental Engineering, Faculty of Engineering, UNSW, Reizes, John, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW, Yeoh, Guan Heng, Mechanical & Manufacturing Engineering, Faculty of Engineering, UNSW.

Subjects/Keywords: CFD model; Vortex risk index; Pump intake; Intake; Critical submergence; VRI; Vortex modelling; ANSI/HI 9.8; Pump sump; MILES; Free surface vortex; Vortex identification; Vortex classification; Vortex

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APA (6^th Edition):

Torbaty, M. (2019). Development of a vortex risk index for use with single-phase computational fluid dynamics in the simulation of intake structures. (Doctoral Dissertation). University of New South Wales. Retrieved from http://handle.unsw.edu.au/1959.4/62455 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58623/SOURCE02?view=true

Chicago Manual of Style (16^th Edition):

Torbaty, Mohammadali. “Development of a vortex risk index for use with single-phase computational fluid dynamics in the simulation of intake structures.” 2019. Doctoral Dissertation, University of New South Wales. Accessed April 21, 2021. http://handle.unsw.edu.au/1959.4/62455 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58623/SOURCE02?view=true.

MLA Handbook (7^th Edition):

Torbaty, Mohammadali. “Development of a vortex risk index for use with single-phase computational fluid dynamics in the simulation of intake structures.” 2019. Web. 21 Apr 2021.

Vancouver:

Torbaty M. Development of a vortex risk index for use with single-phase computational fluid dynamics in the simulation of intake structures. [Internet] [Doctoral dissertation]. University of New South Wales; 2019. [cited 2021 Apr 21]. Available from: http://handle.unsw.edu.au/1959.4/62455 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58623/SOURCE02?view=true.

Council of Science Editors:

Torbaty M. Development of a vortex risk index for use with single-phase computational fluid dynamics in the simulation of intake structures. [Doctoral Dissertation]. University of New South Wales; 2019. Available from: http://handle.unsw.edu.au/1959.4/62455 ; https://unsworks.unsw.edu.au/fapi/datastream/unsworks:58623/SOURCE02?view=true

Brno University of Technology

18. Jízdný, Martin. Od tornáda k vodní turbíně: From tornado to hydraulic turbine.

Degree: 2018, Brno University of Technology

URL: http://hdl.handle.net/11012/16147

► This bachelor thesis deals with vortex motion and contains two main parts. The first part refers to the principles of creation and evolution of vortex… (more)

Subjects/Keywords: Vírový pohyb; vír; vírový cop; tornádo; hurikán; Vortex motion; vortex; vortex rope; tornado; hurricane

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APA (6^th Edition):

Jízdný, M. (2018). Od tornáda k vodní turbíně: From tornado to hydraulic turbine. (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/16147

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jízdný, Martin. “Od tornáda k vodní turbíně: From tornado to hydraulic turbine.” 2018. Thesis, Brno University of Technology. Accessed April 21, 2021. http://hdl.handle.net/11012/16147.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jízdný, Martin. “Od tornáda k vodní turbíně: From tornado to hydraulic turbine.” 2018. Web. 21 Apr 2021.

Vancouver:

Jízdný M. Od tornáda k vodní turbíně: From tornado to hydraulic turbine. [Internet] [Thesis]. Brno University of Technology; 2018. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/11012/16147.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jízdný M. Od tornáda k vodní turbíně: From tornado to hydraulic turbine. [Thesis]. Brno University of Technology; 2018. Available from: http://hdl.handle.net/11012/16147

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

19. Carlson, Bailey McKay. Generation and Analysis of Streamwise Vortices from Vortex Tube Apparatus.

Degree: 2020, North Dakota State University

URL: http://hdl.handle.net/10365/31783

► A pressurized vortex tube is used to generate streamwise vortices in a wind tunnel and the resulting flow behavior is analyzed. The apparatus is intended… (more)

Subjects/Keywords: airfoil; computational fluid dynamics; particle image velocimetry; streamwise vortex; vortex; vortex tube

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APA (6^th Edition):

Carlson, B. M. (2020). Generation and Analysis of Streamwise Vortices from Vortex Tube Apparatus. (Thesis). North Dakota State University. Retrieved from http://hdl.handle.net/10365/31783

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Carlson, Bailey McKay. “Generation and Analysis of Streamwise Vortices from Vortex Tube Apparatus.” 2020. Thesis, North Dakota State University. Accessed April 21, 2021. http://hdl.handle.net/10365/31783.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Carlson, Bailey McKay. “Generation and Analysis of Streamwise Vortices from Vortex Tube Apparatus.” 2020. Web. 21 Apr 2021.

Vancouver:

Carlson BM. Generation and Analysis of Streamwise Vortices from Vortex Tube Apparatus. [Internet] [Thesis]. North Dakota State University; 2020. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/10365/31783.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Carlson BM. Generation and Analysis of Streamwise Vortices from Vortex Tube Apparatus. [Thesis]. North Dakota State University; 2020. Available from: http://hdl.handle.net/10365/31783

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Universidade do Rio Grande do Norte

20. Moura, Thiago Rafael de Silva. Efeitos de Confinamento de Vórtice Magnético em Nanodiscos de Fe e Py .

Degree: 2012, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/18598

► We report two theoretical works, based in numerical simulations. The first study consists in the investigation of equilibrium phases and vortex formation in Ferro and… (more)

Subjects/Keywords: vórtice magnético; nanodiscos; vortex; nanodisks

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APA (6^th Edition):

Moura, T. R. d. S. (2012). Efeitos de Confinamento de Vórtice Magnético em Nanodiscos de Fe e Py . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/18598

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Moura, Thiago Rafael de Silva. “Efeitos de Confinamento de Vórtice Magnético em Nanodiscos de Fe e Py .” 2012. Thesis, Universidade do Rio Grande do Norte. Accessed April 21, 2021. http://repositorio.ufrn.br/handle/123456789/18598.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Moura, Thiago Rafael de Silva. “Efeitos de Confinamento de Vórtice Magnético em Nanodiscos de Fe e Py .” 2012. Web. 21 Apr 2021.

Vancouver:

Moura TRdS. Efeitos de Confinamento de Vórtice Magnético em Nanodiscos de Fe e Py . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2012. [cited 2021 Apr 21]. Available from: http://repositorio.ufrn.br/handle/123456789/18598.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Moura TRdS. Efeitos de Confinamento de Vórtice Magnético em Nanodiscos de Fe e Py . [Thesis]. Universidade do Rio Grande do Norte; 2012. Available from: http://repositorio.ufrn.br/handle/123456789/18598

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Alberta

21. Wiwchar, Justin. Simulation of the initial 3-D instability of a vortex ring.

Degree: MS, Department of Mechanical Engineering, 2010, University of Alberta

URL: https://era.library.ualberta.ca/files/3r074w44q

► Computational simulations of a perturbed vortex ring are performed to recreate and understand the instability seen in impacting water droplet experiments. Three initial conditions are… (more)

Subjects/Keywords: Ring; Vortex; Simulation; Instability

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APA (6^th Edition):

Wiwchar, J. (2010). Simulation of the initial 3-D instability of a vortex ring. (Masters Thesis). University of Alberta. Retrieved from https://era.library.ualberta.ca/files/3r074w44q

Chicago Manual of Style (16^th Edition):

Wiwchar, Justin. “Simulation of the initial 3-D instability of a vortex ring.” 2010. Masters Thesis, University of Alberta. Accessed April 21, 2021. https://era.library.ualberta.ca/files/3r074w44q.

MLA Handbook (7^th Edition):

Wiwchar, Justin. “Simulation of the initial 3-D instability of a vortex ring.” 2010. Web. 21 Apr 2021.

Vancouver:

Wiwchar J. Simulation of the initial 3-D instability of a vortex ring. [Internet] [Masters thesis]. University of Alberta; 2010. [cited 2021 Apr 21]. Available from: https://era.library.ualberta.ca/files/3r074w44q.

Council of Science Editors:

Wiwchar J. Simulation of the initial 3-D instability of a vortex ring. [Masters Thesis]. University of Alberta; 2010. Available from: https://era.library.ualberta.ca/files/3r074w44q

22. Gopal P. Experimental and computational Studies on vehicle aerodynamic drag Reduction by vortex generators;.

Degree: Experimental and computational Studies on vehicle aerodynamic drag Reduction by vortex generators, 2015, Anna University

URL: http://shodhganga.inflibnet.ac.in/handle/10603/37699

►

The rapidly increasing fuel prices and the regulation of green house newlinegases to control global warming have given tremendous pressure on the newlinedesign engineers to… (more)

Subjects/Keywords: Interval to height; Vortex generators

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APA (6^th Edition):

P, G. (2015). Experimental and computational Studies on vehicle aerodynamic drag Reduction by vortex generators;. (Thesis). Anna University. Retrieved from http://shodhganga.inflibnet.ac.in/handle/10603/37699

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

P, Gopal. “Experimental and computational Studies on vehicle aerodynamic drag Reduction by vortex generators;.” 2015. Thesis, Anna University. Accessed April 21, 2021. http://shodhganga.inflibnet.ac.in/handle/10603/37699.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

P, Gopal. “Experimental and computational Studies on vehicle aerodynamic drag Reduction by vortex generators;.” 2015. Web. 21 Apr 2021.

Vancouver:

P G. Experimental and computational Studies on vehicle aerodynamic drag Reduction by vortex generators;. [Internet] [Thesis]. Anna University; 2015. [cited 2021 Apr 21]. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/37699.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

P G. Experimental and computational Studies on vehicle aerodynamic drag Reduction by vortex generators;. [Thesis]. Anna University; 2015. Available from: http://shodhganga.inflibnet.ac.in/handle/10603/37699

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Texas A&M University

23. Maroni Veiga, Adrian Gaston. Analysis and identification of vortices within a turbulent channel boundary layer flow.

Degree: MS, Mechanical Engineering, 2006, Texas A&M University

URL: http://hdl.handle.net/1969.1/3757

► Vortical structures are regarded as the dominant organized patterns in wall turbulence. They play a key role in physical phenomena of practical importance such as… (more)

Subjects/Keywords: vortex Turbulence

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APA (6^th Edition):

Maroni Veiga, A. G. (2006). Analysis and identification of vortices within a turbulent channel boundary layer flow. (Masters Thesis). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3757

Chicago Manual of Style (16^th Edition):

Maroni Veiga, Adrian Gaston. “Analysis and identification of vortices within a turbulent channel boundary layer flow.” 2006. Masters Thesis, Texas A&M University. Accessed April 21, 2021. http://hdl.handle.net/1969.1/3757.

MLA Handbook (7^th Edition):

Maroni Veiga, Adrian Gaston. “Analysis and identification of vortices within a turbulent channel boundary layer flow.” 2006. Web. 21 Apr 2021.

Vancouver:

Maroni Veiga AG. Analysis and identification of vortices within a turbulent channel boundary layer flow. [Internet] [Masters thesis]. Texas A&M University; 2006. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/1969.1/3757.

Council of Science Editors:

Maroni Veiga AG. Analysis and identification of vortices within a turbulent channel boundary layer flow. [Masters Thesis]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3757

Texas A&M University

24. Wei, Hongduo. Spontaneous vortices in ferromagnet-superconductor systems.

Degree: PhD, Physics, 2006, Texas A&M University

URL: http://hdl.handle.net/1969.1/3959

► We study the interaction between superconductors and ferromagnets in two systems: a ferromagnet-superconductor bilayer, and a thin superconducting film with a periodic array of magnetic… (more)

Subjects/Keywords: vortex; superconductor

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APA (6^th Edition):

Wei, H. (2006). Spontaneous vortices in ferromagnet-superconductor systems. (Doctoral Dissertation). Texas A&M University. Retrieved from http://hdl.handle.net/1969.1/3959

Chicago Manual of Style (16^th Edition):

Wei, Hongduo. “Spontaneous vortices in ferromagnet-superconductor systems.” 2006. Doctoral Dissertation, Texas A&M University. Accessed April 21, 2021. http://hdl.handle.net/1969.1/3959.

MLA Handbook (7^th Edition):

Wei, Hongduo. “Spontaneous vortices in ferromagnet-superconductor systems.” 2006. Web. 21 Apr 2021.

Vancouver:

Wei H. Spontaneous vortices in ferromagnet-superconductor systems. [Internet] [Doctoral dissertation]. Texas A&M University; 2006. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/1969.1/3959.

Council of Science Editors:

Wei H. Spontaneous vortices in ferromagnet-superconductor systems. [Doctoral Dissertation]. Texas A&M University; 2006. Available from: http://hdl.handle.net/1969.1/3959

University of Wollongong

25. George, Jonathan. A study of vortex dynamics in patterned superconducting thin films.

Degree: M. Phil., 2016, University of Wollongong

URL: 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity, 100706 Nanofabrication, Growth and Self Assembly ; https://ro.uow.edu.au/theses/4914

► This thesis can be divided into two primary works, examining the effects of uniform and non-uniform pinning arrays of antidots in YBCO thin films,… (more)

Subjects/Keywords: superconductivity; large antidots; vortex pinning

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APA (6^th Edition):

George, J. (2016). A study of vortex dynamics in patterned superconducting thin films. (Masters Thesis). University of Wollongong. Retrieved from 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity, 100706 Nanofabrication, Growth and Self Assembly ; https://ro.uow.edu.au/theses/4914

Chicago Manual of Style (16^th Edition):

George, Jonathan. “A study of vortex dynamics in patterned superconducting thin films.” 2016. Masters Thesis, University of Wollongong. Accessed April 21, 2021. 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity, 100706 Nanofabrication, Growth and Self Assembly ; https://ro.uow.edu.au/theses/4914.

MLA Handbook (7^th Edition):

George, Jonathan. “A study of vortex dynamics in patterned superconducting thin films.” 2016. Web. 21 Apr 2021.

Vancouver:

George J. A study of vortex dynamics in patterned superconducting thin films. [Internet] [Masters thesis]. University of Wollongong; 2016. [cited 2021 Apr 21]. Available from: 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity, 100706 Nanofabrication, Growth and Self Assembly ; https://ro.uow.edu.au/theses/4914.

Council of Science Editors:

George J. A study of vortex dynamics in patterned superconducting thin films. [Masters Thesis]. University of Wollongong; 2016. Available from: 020404 Electronic and Magnetic Properties of Condensed Matter; Superconductivity, 100706 Nanofabrication, Growth and Self Assembly ; https://ro.uow.edu.au/theses/4914

26. Polvani, Lorenzo M. Geostrophic vortex dynamics.

Degree: 1988, MIT and Woods Hole Oceanographic Institution

URL: http://hdl.handle.net/1912/4961

► By generalizing the method of contour dynamics to the quasigeostrophic two layer model, we have proposed and solved a number of fundamental problems in the… (more)

Subjects/Keywords: Vortex-motion

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APA (6^th Edition):

Polvani, L. M. (1988). Geostrophic vortex dynamics. (Thesis). MIT and Woods Hole Oceanographic Institution. Retrieved from http://hdl.handle.net/1912/4961

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Polvani, Lorenzo M. “Geostrophic vortex dynamics.” 1988. Thesis, MIT and Woods Hole Oceanographic Institution. Accessed April 21, 2021. http://hdl.handle.net/1912/4961.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Polvani, Lorenzo M. “Geostrophic vortex dynamics.” 1988. Web. 21 Apr 2021.

Vancouver:

Polvani LM. Geostrophic vortex dynamics. [Internet] [Thesis]. MIT and Woods Hole Oceanographic Institution; 1988. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/1912/4961.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Polvani LM. Geostrophic vortex dynamics. [Thesis]. MIT and Woods Hole Oceanographic Institution; 1988. Available from: http://hdl.handle.net/1912/4961

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Otago

27. Rooney, Samuel James. C-field description of the quasi-equilibrium Bose gas: Persistent currents and kelvon-induced vortex decay .

Degree: 2012, University of Otago

URL: http://hdl.handle.net/10523/2538

► Recent experiments at the University of Arizona have demonstrated superb control and imaging of flattened superfluids revealing a rich landscape of vortex dynamics. Vortex dipoles… (more)

▼ Recent experiments at the University of Arizona have demonstrated superb control and imaging of flattened superfluids revealing a rich landscape of vortex dynamics. Vortex dipoles have been created and their dynamics observed [Neely et al. Phys. Rev. Lett. 104, 160410 (2010)], and highly charged persistent currents have been formed through a clever combination of stirring and dissipation [T. W. Neely, PhD thesis, (2010)]. Many ultra-cold gas systems, including these, are in a regime that we may characterize as quasi-equilibrium: despite some external forcing, a large fraction of the gas remains in thermal equilibrium. In this thesis we use the stochastic projected Gross-Pitaevskii equation (SPGPE) to make quantitative predictions of the quasi-equilibrium Bose gas. We quantitatively compare the SPGPE with experiment by modeling the persistent current formation experiment performed at the University of Arizona [T. W. Neely, PhD thesis, (2010)]. We determine all SPGPE parameters for the toroidal system prior to simulation, enabling quantitative modeling of the experiment with no fitting parameters, giving a true test of the SPGPE theory. We find the SPGPE gives quantitative agreement with experiment, accurately predicting the size of the persistent current as well as the decay time of the vortices. We also observe the crucial role that thermal fluctuations have on enabling this agreement, showing the comprehensive SPGPE treatment is necessary to make quantitatively accurate calculations of quasi-equilibrium systems. This is the first quantitative agreement with experimental observations of vortex dynamics obtained with a theory of dissipation from first principles using no fitting parameters. We then systematically study the Kelvin mode excitations on a vortex line in a three dimensional Bose-Einstein condensate using the SPGPE. We give a quantitative measure of the magnitude of vortex bending caused by the activation of Kelvin modes, and find that vortex bending can be suppressed by tightening the confinement along the direction of the vortex line. This leads to a strong suppression of the vortex decay rate as the system enters a regime of two-dimensional vortex dynamics, characterized by a critical oblateness. In our final application of the SPGPE we simulate the decay of a vortex dipole. We model a recent experiment of Neely et al. [Neely et al. Phys. Rev. Lett. 104, 160410 (2010)], finding the SPGPE predicts a dipole lifetime consistent with experimental observations. We also show the experiment lies in the two-dimensional regime of vortex dynamics, validating our critical oblateness calculation. Advisors/Committee Members: Bradley, Ashton (advisor).

Subjects/Keywords: Bose-Einstein condensates; Vortex dynamics

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APA (6^th Edition):

Rooney, S. J. (2012). C-field description of the quasi-equilibrium Bose gas: Persistent currents and kelvon-induced vortex decay . (Masters Thesis). University of Otago. Retrieved from http://hdl.handle.net/10523/2538

Chicago Manual of Style (16^th Edition):

Rooney, Samuel James. “C-field description of the quasi-equilibrium Bose gas: Persistent currents and kelvon-induced vortex decay .” 2012. Masters Thesis, University of Otago. Accessed April 21, 2021. http://hdl.handle.net/10523/2538.

MLA Handbook (7^th Edition):

Rooney, Samuel James. “C-field description of the quasi-equilibrium Bose gas: Persistent currents and kelvon-induced vortex decay .” 2012. Web. 21 Apr 2021.

Vancouver:

Rooney SJ. C-field description of the quasi-equilibrium Bose gas: Persistent currents and kelvon-induced vortex decay . [Internet] [Masters thesis]. University of Otago; 2012. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/10523/2538.

Council of Science Editors:

Rooney SJ. C-field description of the quasi-equilibrium Bose gas: Persistent currents and kelvon-induced vortex decay . [Masters Thesis]. University of Otago; 2012. Available from: http://hdl.handle.net/10523/2538

Université de Neuchâtel

28. Tesei, Mauro. Interplay of frustration and geometry in Josephson junction arrays on a dice lattice.

Degree: 2005, Université de Neuchâtel

URL: http://doc.rero.ch/record/5323

► Cette thèse est dédiée aux effets de compétition entre le champ magnétique appliqué et la géométrie du pavage de réseaux de jonctions Josephson dans le… (more)

▼ Cette thèse est dédiée aux effets de compétition entre le champ magnétique appliqué et la géométrie du pavage de réseaux de jonctions Josephson dans le cas particulier d'un pavage T3 ("dice"). Il s'agit en fait de l'étude d'un système modèle dans des conditions réelles. Le comportement des réseaux de jonctions classiques a été étudié en fonction du champ magnétique appliqué, de la température et de la fréquence avec laquelle le système est excité. Les propriétés de transport des réseaux de jonctions Josephson réalisées par effet de proximité sont mises en évidence par des mesures de l'impédance de surface effectuées au moyen d'une technique inductive qui distingue les travaux de recherche menés au sein du groupe. Selon la valeur du champ magnétique appliqué, il sera impossible pour le réseau de jonctions de se placer dans un minimum absolu d'énergie. Le système doit alors trouver un compromis entre les différentes contraintes liées à la fois au champ magnétique appliqué et à la géométrie du réseau. C'est dans une telle situation que le système est dit frustré. Le comportement est radicalement différent selon l'état de frustration, i.e. selon le champ magnétique appliqué. La particularité du pavage T3, composé de losanges orientés selon trois directions différentes, se manifeste lorsque le champ appliqué est tel que chaque losange du réseau est traversé par un demi quantum de flux. Dans ce cas la cohérence de phase, et par conséquent la supraconductivité, dans l'échantillon est presque supprimée et la dissipation est plus importante que pour n'importe quelle autre valeur de champ magnétique. Une comparaison entre cet état dit totalement frustré et un état qui au contraire présente une forte cohérence de phase a permis de révéler une riche variété de phénomènes. Les propriétés liées au modèle de mécanique statistique étudié, le modèle "XY", appliqué à cette géométrie particulière permettent de comprendre une partie seulement des observations. Il a donc été nécessaire d'aller au-delà du système modèle et pour la première fois les effets d'écrantage magnétique provenant du réseau de jonctions ont été pris en compte afin de comprendre le comportement critique. Ces effets magnétiques peuvent même être dominants dans la région critique du modèle statistique et en changer le comportement, comme dans le cas de l'état totalement frustré. Par ailleurs les observations expérimentales montrent à basse température une dynamique similaire pour plusieurs états de frustration et pour différentes géométries du pavage. Ces similitudes reflètent la prédominance de paramètres intrinsèques au type de réseaux de jonctions étudié et à leur procédé de fabrication. Cette thèse répond à plusieurs interrogations surgies à la suite de travaux antérieurs, notamment sur le comportement critique de l'état totalement frustré. A son tour ce travail laisse quelques questions ouvertes concernant les mécanismes qui ont majeure influence sur la dynamique des vortex et plus généralement des défauts topologiques dans les réseaux de jonctions Josephson… Advisors/Committee Members: Piero (Dir.).

Subjects/Keywords: vortex dynamics

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APA (6^th Edition):

Tesei, M. (2005). Interplay of frustration and geometry in Josephson junction arrays on a dice lattice. (Thesis). Université de Neuchâtel. Retrieved from http://doc.rero.ch/record/5323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Tesei, Mauro. “Interplay of frustration and geometry in Josephson junction arrays on a dice lattice.” 2005. Thesis, Université de Neuchâtel. Accessed April 21, 2021. http://doc.rero.ch/record/5323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Tesei, Mauro. “Interplay of frustration and geometry in Josephson junction arrays on a dice lattice.” 2005. Web. 21 Apr 2021.

Vancouver:

Tesei M. Interplay of frustration and geometry in Josephson junction arrays on a dice lattice. [Internet] [Thesis]. Université de Neuchâtel; 2005. [cited 2021 Apr 21]. Available from: http://doc.rero.ch/record/5323.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Tesei M. Interplay of frustration and geometry in Josephson junction arrays on a dice lattice. [Thesis]. Université de Neuchâtel; 2005. Available from: http://doc.rero.ch/record/5323

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Houston

29. Stout, Eric. Instability of a Vortex Column Due to Turbulence Generated Axial Flow.

Degree: MS, Mechanical Engineering, 2013, University of Houston

URL: http://hdl.handle.net/10657/1212

► Axial flow generated by turbulence on an initially two-dimensional vortex column, the Lamb-Oseen vortex, is studied theoretically and by direct numerical simulation of the Navier-Stokes… (more)

Subjects/Keywords: Vortex dynamics; Instability; Turbulence

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APA (6^th Edition):

Stout, E. (2013). Instability of a Vortex Column Due to Turbulence Generated Axial Flow. (Masters Thesis). University of Houston. Retrieved from http://hdl.handle.net/10657/1212

Chicago Manual of Style (16^th Edition):

Stout, Eric. “Instability of a Vortex Column Due to Turbulence Generated Axial Flow.” 2013. Masters Thesis, University of Houston. Accessed April 21, 2021. http://hdl.handle.net/10657/1212.

MLA Handbook (7^th Edition):

Stout, Eric. “Instability of a Vortex Column Due to Turbulence Generated Axial Flow.” 2013. Web. 21 Apr 2021.

Vancouver:

Stout E. Instability of a Vortex Column Due to Turbulence Generated Axial Flow. [Internet] [Masters thesis]. University of Houston; 2013. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/10657/1212.

Council of Science Editors:

Stout E. Instability of a Vortex Column Due to Turbulence Generated Axial Flow. [Masters Thesis]. University of Houston; 2013. Available from: http://hdl.handle.net/10657/1212

University of Debrecen

30. Novák, Anna. Keverés vizsgálata keverő-berendezés és számítógépes szimuláció segítségével .

Degree: DE – TEK – Természettudományi és Technológiai Kar – Kémiai Intézet, 2012, University of Debrecen

URL: http://hdl.handle.net/2437/153037

Mérésim a teljesítménytényező- Re-szám, illetve a Vo-szám- Re-szám kapcsolatának vizsgálatára irányultak. A vizsgált keverő elem w/d értéke a turbinakeverőknél szokásos 0,2-0,3 értékkel szemben 0,7 fölötti érték, ami a lapkeverőhöz közelít, így a várható Re-szám- teljesítménytényező értékeket e két keverőtípushoz viszonyítva vizsgálhatom. Advisors/Committee Members: Szepesi, Gábor (advisor).

Subjects/Keywords: keverés teljesítményszükséglete; Vortex szám

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APA (6^th Edition):

Novák, A. (2012). Keverés vizsgálata keverő-berendezés és számítógépes szimuláció segítségével . (Thesis). University of Debrecen. Retrieved from http://hdl.handle.net/2437/153037

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Novák, Anna. “Keverés vizsgálata keverő-berendezés és számítógépes szimuláció segítségével .” 2012. Thesis, University of Debrecen. Accessed April 21, 2021. http://hdl.handle.net/2437/153037.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Novák, Anna. “Keverés vizsgálata keverő-berendezés és számítógépes szimuláció segítségével .” 2012. Web. 21 Apr 2021.

Vancouver:

Novák A. Keverés vizsgálata keverő-berendezés és számítógépes szimuláció segítségével . [Internet] [Thesis]. University of Debrecen; 2012. [cited 2021 Apr 21]. Available from: http://hdl.handle.net/2437/153037.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Novák A. Keverés vizsgálata keverő-berendezés és számítógépes szimuláció segítségével . [Thesis]. University of Debrecen; 2012. Available from: http://hdl.handle.net/2437/153037

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Open Access Theses and Dissertations