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 41 for “"3D Flow"”.
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3D-flow measurement by stereo imaging
Ein neues Verfahren zur Messung des dreidimensionalen Strömungsfeldes mittels 'Particle Tracking Velocimetry' wird vorgestellt. Ein zweidimensionales Particle Tracking Velocimetry liegt dem Verfahren zugrunde. Es wurde auf die dritte Raumdimension erweitert, um den gesamten physikalischen Raum zu …
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Parallel Multigrid Method for Adaptive Finite Elements with Application to 3D Flow Problems
… consideration arise from chemically reacting flows. A focal point is the analysis of a finite element discretization with stabilized finite elements of degree two. Aspects of error estimation, solution techniques and mesh adaptivity are discussed with regard to the Navier-Stokes equations. …
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A computational study of the 3D flow and performance of a vaned radial diffuser
… diffuser using the MEFP (The Moore Elliptic Flow Program) flow code. The vaned diffuser studied by Dalbert et al. was chosen as a test case for this thesis. The geometry and inlet conditions were established from this study. The performance of the computational diffuser was compared to the …
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Initial Value Problems for Creeping Flow of Maxwell Fluids
We consider the flow of nonlinear Maxwell fluids in the unsteady quasistatic case, where the effect of inertia is neglected. We study the well-posedness of the resulting PDE initial-boundary value problem. This well-posedness depends on the unique solvability of an elliptic boundary value problem. …
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Effects of pore-scale fluid flow on fluid-solid reactions in porous and fractured media
… issues. Recent studies have shown that fluid flow is one of the key controlling factors in fluid-solid reactions because it significantly affects the concentration gradients of reactants at the fluid-solid interfaces. Subsurface flow rates exhibit significant variability, and fluid inertia can …
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An In Vitro 3D Model to Evaluate Behaviour of Breast Cancer Cells and Response to Treatment
The field of 3D culture models of disease has started to move towards systems that aim to recapitulate the complexity of human tissues. However, despite recent improvements, current 3D systems remain overly simplistic, lacking the biophysical characteristics and diverse structures found in most …
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Performance optimization of a subsonic Diffuser-Collector subsystem using interchangeable geometries
… 3-hole and 5-hole probes were traversed into the flow to generate multiple diffuser inlet and collector exit performance profile plots. Surface oil flow visualization was performed to gain an understanding of the complex 3D flow structures inside the diffuser-collector subsystem. The cutback …
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DEVELOPMENT OF GAS KINETIC FLUX SOLVERS AND THEIR APPLICATIONS
… been developed and applied to solve a variety of flow problems. Firstly, two types of GKFSs have been successfully proposed for both inviscid and viscous flow simulations. The developed solvers have been validated in a variety of 1D to 3D flow simulations. Numerical results demonstrate that the …
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Aerodynamic design and analysis of small horizontal axis wind turbine blades
… studies of mesh and turbulence models in 2D and 3D CFD modelling were conducted. The CFD predicted lift and drag coefficients of the airfoil S809 were compared with wind tunnel test data and the 3D CFD modelling method of the NREL/NASA Phase VI wind turbine were validated against measurements. …
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Phase-space representation of digital holographic and light field imaging with application to two-phase flows
… underwater research, in particular, two-phase flows measurements, are presented. The techniques under study, digital holographic imaging and light field imaging, are targeted at different flow conditions. In low-density flows, particles and air bubbles in water can be imaged by a digital …
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Large Eddy Simulation Reduced Order Models
… order model (LES-ROM) framework for fluid flows. Proper orthogonal decomposition is utilized to extract the dominant spatial structures of the system. Within the general LES-ROM framework, two approaches are proposed to address the celebrated ROM closure problem. No phenomenological …
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Robust control of non-linear 2D and linear 3D disturbances in channel flow by surface transpiration
… in both periodic and non-periodic channel flow is attempted through wall-normal transcription and point wall-shear-stress measurements. The transcription is applied in both continuous harmonic form and a system based on discrete zero-net-mass-flux panel-pair form. For 2D flow it is …
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Investigation et modélisation des tensions circonférentielles en simulation méridienne
… severe drawbacks to systematic use of modern 3D Navier-Stokes codes in a design procedure of multistage turbomachines. That explains why throughflow simulation is still widely used at industrial scale. The main limitation of throughflow is however the need for empirical models to reproduce …
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Turbulence Modelling for Complex Flows in Turbomachinery
… be a more reliable tool for modelling complex flows in turbomachinery. To achieve this goal, a three-dimensional (3D) flow phenomenon that embodies many key features of turbomachinery flows, that is, the corner separation flow often found in axial compressor stators, is selected as the research …
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Spatio-Temporal Analysis of Flows Close to Free Water Surfaces
… a detailed knowledge is needed about the flow field within and beneath the water-side viscous boundary layer. Therefore a novel measurement technique is developed for the spatio-temporal analysis of flows close to free water surfaces. A fluid volume is illuminated by LEDs. Small spherical …
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Stochastic and deterministic models for dense granular flow
… two models are developed for dense granular flow, each capable of predicting flows with accuracy in multiple environments. The models are based on differing perspectives of grain-level dynamics, with one deriving flow from a stochastic mechanism and the other from a deterministic deformation …
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Quantifying microbubble streaming and its applications
… and exciting ways in which to drive microfluidic flows. A simple and powerful flow actuation method involves the use of acoustically excited microbubbles. For ease of manufacture and flow control, setups have largely focused on microbubbles of semi-cylindrical shape, attached to a wall of the …
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Three-Dimensional Unsteady Hydrodynamics of Tidal Turbines
… fluctuating loads that result from the unsteady flow, either from high-cycle fatigue or from extreme loading events exceeding the ultimate tensile strength of components. In this thesis, the problem of unsteady loading is addressed by identifying the shortcomings of the models currently used to …
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High-resolution simulation of pattern formation and coarsening dynamics in 3D convective mixing
… in 2D, little is known about this process in 3D. In this thesis we investigate the pattern-formation aspects of convective mixing during geological C0₂ sequestration by means of high-resolution three-dimensional simulation. We find that the C0₂ concentration field self-organizes as a cellular …
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Volumetric analysis of lamprey hydrodynamics using synthetic aperture particle image velocimetry
… in this thesis. Volumetric, time-resolved flow field analysis of freely swimming lamprey, Petromyzon marinus, are presented from SAPIV experiments. As the most primitive living vertebrate, this eel-shaped fish has served as a model organism for understanding locomotion control in …
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