Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 35 for “"Coherent structure"”.
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Multi-scale Coherent Structure Extraction and Visualization for Flow Analysis
Coherent structures are important features in fluid flows. A better understanding of the physics of coherent structures will help explain a diverse range of physical phenomena and help improve our capability of modeling complex turbulence flows, such as those often seen in combustion, chemical …
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Machine Learning for Coherent Structure Identification and Super Resolution in Turbulent flows
… utilize bayesian inference to automate turbulent coherent structure identification in boundary layer flows. Automated identification was hitherto hindered by the lack of a priori information about the convecting velocities of the coherent structures. A Rankine vortex model is utilized to implement …
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Near field behavior of reacting free jets
… Circular jet simulations showed low levels of coherent structure formation and little oxidizer entrainment. The nonreacting elliptical jet exhibited out-of-plane vortex dynamics and subsequently, structure merging primarily contained within the minor axis region. Chemical reaction hindered …
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Abstraction in technical computing
… argues that what is really needed is a more coherent structure for this functionality. To find one, we must ask what technical computing is really about. This thesis suggests that this kind of programming is characterized by an emphasis on operator complexity and code specialization, and that …
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Bi-Modal Excitation of a Supersonic Rectangular Jet
… interaction is used to help identify a dominant coherent structure, referred to as “f”. For the symmetric disturbance, a Strouhal number of 0.15, based on the height of the jet, is found to be the most amplified frequency. The ROM is then used including interaction where either the subharmonic …
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Guiding principles in medical law : the ability to treat
… This thesis argues that there is a logical and coherent structure to this area of the law. This is achieved through the application of key guiding principles to a range of important issues throughout a patient’s life from birth to death. The guiding principles looked at are: self-determination, …
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Analysis of the effects of coherent flow structures on the transport of particles around submerged obstacles in streams
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2026-08-01
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Characteristics of Coherent Structures in Marine Atmospheric Surface Layer
… the spatial and temporal characteristics of coherent structures in the near neutral marine atmospheric surface layer. With Taylor's hypothesis, the temporal velocity signals have been transformed to spatial fluctuations and then visualize these spatial velocity fluctuations to identify the …
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The Big X of Leadership: A Functional Approach to Understand Different Ways to Lead
… that organizes the leadership landscape into a coherent structure. This thesis moves beyond existing descriptive taxonomies, offering theoretically grounded explanations for why leadership constructs cluster, and how they differ in their functions in influencing followers.<p></p>
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Interannual variability of the Atlantic Hadley circulation in boreal summer and its impacts on tropical cyclone activity
… proposed marsupial paradigm, the frequency and structure of wave pouches were examined. In the positive phase of M1, the pouch frequency increases, and the number of pouches with a vertically coherent structure also rises significantly. A deep and vertically aligned wave pouch has been shown …
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Systematizing God's Law: Rabbanite Jurisprudence In The Islamic World From The Tenth To The Thirteenth Centuries
… dialectical, and discursive corpus into a structured, elegant, and logical system. In so doing, they sought to impose a coherent structure on their legal traditions that would be compatible with larger theological, philosophical, and epistemological ideas. By subjecting Rabbanite legal …
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Chaos Control of an Open Shear Flow: A Novel Control Strategy and its Experimental Demonstration in an Axisymmetric Jet
… dynamical systems approach to control the coherent structure dynamics and turbulence in the near field of an axisymmetric jet is presented. Experiments were performed in an initially laminar circular jet, housed in a low-noise anechoic chamber. Periodic flow states involving various …
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A spatial development framework for the Northern Inner Cape Town Sub-metropolitan District
… parcel of land. However, it currently lacks coherent structure, resulting in the need for a sound development strategy to direct future growth in this locality. Through an assessment of the complexities of the urban system at the metropolitan scale, as well as an analysis and interpretation …
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Corporate Entrepreneurship programs : practices and their implications in developing economies
… area is incomplete and fragmented. It lacks a coherent structure that would allow organizations to achieve productive outcomes. Therefore, developing an integrated perspective to support firms in installing a corporate entrepreneurship structure and, at the same time, develop managers for this …
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A Reduced-Order Model Bi-Modal Excitation of a Supersonic Planar Jet
… is used to compute the shape assumptions for the coherent structure components involved in the set of ordinary differential equations. The set of ordinary differential equations is first solved for a single mode. The trends for the single mode excitation qualitatively compared well with previous …
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Argon bubble transport and capture in continuous casting with an external magnetic field using GPU-based large eddy simulations
… Navier-Stokes solver, CUFLOW, is developed. A Coherent-Structure Smagorinsky LES model is implemented to model the turbulent flow. A two-way coupled Lagrangian particle tracking model is added to track the motion of argon bubbles. A particle/bubble capture model based on force balance at …
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Stochastic estimation of near-wall closure in turbulence models
… The stochastic estimation method resolves coherent structure of the wall layer using empirical correlation functions, and provides an accurate estimation of the wall layer characteristics. As in standard large eddy simulations, a wall shear stress model is developed and applied to a direct …
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Detecting and analyzing coherent structures in two-dimensional dynamical systems
The identification of coherent structures enhances the understanding of transport by complex flows such as those found at the ocean surface. The rapidly developing approach of Lagrangian Coherent Structures (LCSs) is based on the identification of codimension-1 structures that are locally the …
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Integrable symmetric fields in computational design : from stable woven shells to seamless parameterizations
… and then rationalizing it into a discrete, coherent structure. A powerful algorithmic approach for problems of this form is to solve an optimization problem that attempts to "integrate" the direction field, e.g. by recovering a scalar potential whose gradients match the directions. The …
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Large Eddy Simulations of complex turbulent flows
… and free-stream turbulence length scales on the coherent structure dynamics for jets-in-crossflow. Fundamental flow physics and heat transfer issues are addressed by extracting coherent structures from time-dependent three dimensional flow fields of film-cooling by inclined jet and studying their …
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