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 210 for “"turbulent flows"”.
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Turbulent flows over canopies
In this thesis, turbulent flows over canopies in the sparse and dense regimes are examined using direct numerical simulation. The term `canopy' is used to refer to tall roughness elements in the flow. Sparse canopies typically have large element spacings and allow turbulent eddies to penetrate …
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Kinematics of Vortices in Turbulent Flows
… a hierarchy of vortices in the physical space of turbulent flows is commonly extended to Fourier space. Through an analysis of Gaussian vortices, we explore the concept a vortex in Fourier space in terms of local flow kinematics. We find that interpreting a hierarchy of vortices in Fourier space …
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Advanced Spectral Methods for Turbulent Flows
… and accuracy, for generalized homogeneous turbulent flows, and especially for specialized applications like the computation of atmospheric flows and numerical weather prediction. In this thesis, two such innovations are presented. First, inspired by the adaptive mesh refinement (AMR) …
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Similarity in adverse pressure gradient turbulent flows
The purpose of this research is to experimentally generate increasingly adverse pressure gradient flow data for comparison with published data, to find similarities allowing categorization leading to improved flow prediction.
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Machine learning for transitional and turbulent flows
L'abstract è presente nell'allegato / the abstract is in the attachment
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Large Eddy Simulations of complex turbulent flows
… dissertation a solution methodology for complex turbulent flows of industrial interests is developed using a combination of Large Eddy Simulation (LES) and Immersed Boundary Method (IBM) concepts. LES is an intermediate approach to turbulence simulation in which the onus of modeling of …
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Free surface dynamics in shallow turbulent flows.
… govern free surface behaviour in depth-limited turbulent flows. Experimental data has shown that the turbulence properties at a point near the free surface relate directly to the properties of the free surface pattern. This would suggest a direct linkage between the free surface and the …
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Entrainment of Sediment by Unsteady Turbulent Flows
… the response of sediment to unsteady flows. The data that were gathered include temporal distributions of sediment concentration, shear stress, and velocity for two types of flow conditions: tests where the flow was increased from rest to a peak velocity and was then held constant, and …
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Energetics and mixing in stratified turbulent flows
Turbulent mixing has an important influence on many physical processes in the ocean. For example, the upwelling of water through the stably stratified ocean interior, needed to close the global circulation, is only possible through the enhanced vertical mixing resulting from turbulence. The …
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Simulation of Turbulent Flows Using Nodal Integral Method
… to turbulence in Arnold-Beltrami-Childress (ABC) flows. These flows display the interesting phenomenon of heteroclinic cycles. The results are obtained for two wavenumbers: k = 1 (also studied earlier by other researchers) and k = 2, respectively. The results for k = 1 are compared with those …
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Heat Transfer in Non-isothermal Particle-laden Turbulent Flows
L'abstract è presente nell'allegato / the abstract is in the attachment
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Very -Large -Scale Motions in Wall -Bounded Turbulent Flows
Overall, results indicate that the hairpin vortex and its organization into packets is a robust and significant feature of wall-bounded turbulence over a wide range of Reynolds numbers. The hairpin-vortex-packet model of turbulence provides a consistent explanation for the distribution of energy …
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Numerical models for rotating Lagrangian particles in turbulent flows
… the rotational effects of particles in complex turbulent flows. Part of the focus of the research is to provide novel techniques to model particle-surface collision induced rotation as well as develop correlations for forces and torques on non-spherical particles. Particulates in nature have a …
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Three Dimensional Laser Diagnostics for Turbulent Flows and Flames
… significance and practical applications, turbulent flows and flames have been under extensive and intensive research for a long time. Turbulent flows and flames of interests to practice inherently have three-dimensional (3D) spatial structures, and therefore diagnostic techniques that can …
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An investigation of developing and developed turbulent flows through annuli.
Dept. of Mechanical, Automotive, and Materials Engineering. Paper copy at Leddy Library: Theses & Major Papers - Basement, West Bldg. / Call Number: Thesis1973 .P25. Source: Dissertation Abstracts International, Volume: 62-13, Section: A. Thesis (Ph.D.)--University of Windsor (Canada), 1973.
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Pressure signature in adverse-pressure-gradient wall bounded turbulent flows
… in wall-bounded adverse pressure gradient turbulent flows. For this purpose, the experimental work has been carried out towards further understanding of this class of flows, especially when the pressure gradient is increasingly adverse. Adverse pressure gradient turbulent flows and …
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Vortex detection and tracking in massively separated and turbulent flows
… applied to more cases involving vortex dominated flows to explore and expand their application in providing insight of flow physics. For a set of experimental two-component PIV data in the wake of a purely pitching trapezoidal panel, the Lagrangian analysis of FTLE-saddle tracking identifies and …
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Application of viscous-inviscid interaction methods to transonic turbulent flows
… developed for the analysis of steady transonic flows. The viscous and inviscid solutions are coupled through the displacement concept using a transpiration velocity. In the semi-inverse interaction method, the viscous and inviscid equations are solved in an explicitly separate manner and the …
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