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 13 of 13 for “"Lagrangian analysis"”.
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Lagrangian analysis of vector and tensor fields: Algorithmic foundations and applications in medical imaging and computational fluid dynamics
… combines generalized notions of Eulerian and Lagrangian perspectives for the structural analysis of multi-field datasets.</p> <p>Overall, we present a set of methods that apply a generalized notion of Lagrangian description, originally developed in fluid dynamics, to the analysis of vector and …
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MECHANICAL AND HYDRAULIC CHARACTERIZATION OF PLASTIC CONCRETE
… levels and confining pressures. A FLAC (Fast Lagrangian Analysis of Continua) finite difference analysis was also performed to evaluate the working strains in plastic concrete walls during the construction and impoundment (i.e. rising of the reservoir) of an embankment dam. The FLAC analysis …
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Numerical modelling of tidal flows around headlands and islands
… a deterministic tidal flow field is simulated. Lagrangian analysis techniques are required to properly interpret transport processes. The significant impact of transient eddy features generated by the headland is indicated by the mixing and dispersion diagrams presented. A defined front between …
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Advancing the theory and applications of Lagrangian Coherent Structures methods for oceanic surface flows
… dynamics. Building on the recent emergence of Lagrangian methods, this thesis investigates the present-day abilities to describe and understand the organization of flow transport at the ocean surface, including the abilities to detect the underlying key structures, the regions of stirring and …
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Vertical fluxes in the upper ocean
… below the mixed layer into two components in a Lagrangian frame: vertical velocity along sloping isopycnal surfaces and the adiabatic vertical velocity of isopycnal surfaces and demonstrate that vertical motion along isopycnal surfaces is particularly important at submesoscales (1-10 km). The …
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Vertical Fluxes in the Upper Ocean
… below the mixed layer into two components in a Lagrangian frame: vertical velocity along sloping isopycnal surfaces and the adiabatic vertical velocity of isopycnal surfaces and demonstrate that vertical motion along isopycnal surfaces is particularly important at submesoscales (1-10 km). The …
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Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres
This work investigates how a Lagrangian perspective applies to models of two oceanographic flows: an overturning submesoscale eddy and the Western Alboran Gyre. In the first case, I focus on the importance of diffusion as compared to chaotic advection for tracers in this system. Three methods are …
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Chaotic advection, mixing, and property exchange in three-dimensional ocean eddies and gyres
This work investigates how a Lagrangian perspective applies to models of two oceanographic flows: an overturning submesoscale eddy and the Western Alboran Gyre. In the first case, I focus on the importance of diffusion as compared to chaotic advection for tracers in this system. Three methods are …
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Vortex detection and tracking in massively separated and turbulent flows
… function and 𝑄 criterion are used along with the Lagrangian coherent structures (LCS) analyses including the finite-time Lyapunov exponent (FTLE), the geodesic LCS, and the Lagrangian-Averaged Vorticity Deviation (LAVD). Each of \h{these} Lagrangian methods \h{is} applied at the centers and …
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An analysis of heavy rainfall events over the Limpopo River Basin in southern Africa, their moisture sources and pathways
… cycle of the top 200 heavy rainfall events, the analysis then applied the Lagrangian trajectory model HYSPLIT, with NCEP II reanalysis data as input, to backtrack air parcels from the LRB to their moisture source on seasonal scales and in terms of the types of weather systems involved. The …
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Improved Load Distribution for Load Rating of Low-Fill Box Structures
… of the test culverts were created in the Fast Lagrangian Analysis of Continua in 3 Dimensions (FLAC3D) software and were verified against the field test results. The verified finite difference models of the culverts were used for a parametric study to analyze the effects of pavement type (i.e., …
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Analysis of hybrid electrothermomechanical microactuators with integrated electrothermal and electrostatic actuation
… fields in the steady-state. Employing a Lagrangian approach, the inhomogeneous current conduction equation is used to describe the electric potential, while the thermal and displacement fields are obtained by solving the nonlinear heat conduction equation and by performing a large …
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Mixing in stably stratified turbulent flows: improved parameterizations of diapycnal mixing in oceanic flows
… microstructure data and methodology for data analysis in order to develop/test appropriate parameterization of the mixing efficiency, (2) to determine the relevant length and velocity scales for diapycnal mixing, (3) to provide improved parameterization(s) of diapycnal mixing grounded on …