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.
Results
Showing 1 to 20 of 26 for “"3D effects"”.
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Time-Lapse Variations of Multi-Component Electrical Resistivity Measurements Acquired in High-Angle Wells
… Some efforts have been made to study these effects, but the actual spatial distribution of fluid saturation due to invasion has not been considered in previous works. We use a commercial multi-phase fluid-flow simulator to reproduce invasion behavior in high-angle wells. Simulations provide …
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Approximating three-dimensional fluid flow in a microfluidic device with a two-dimensional, depth-averaged lattice Boltzmann method
… may neglect significant three-dimensional (3D) effects on the velocity field and contribute to model error. To avoid the computational cost of a 3D numerical model, some 3D effects may be approximated in a 2D model. In prior work in the literature, viscous drag from the top and bottom …
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Three-Dimensional Simulations of the Behaviour of Layered Soils under Simple Shear
… and layered soils under simple shear using 3D numerical analyses, focusing on the influence of a thin clay layer within sandy soils on strength and liquefaction resistance. Comparison of 2D and 3D simulations of direct simple shear (DSS) tests highlights qualitative differences and internal …
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Three-Dimensional Unsteady Hydrodynamics of Tidal Turbines
… Tidal turbines are strongly three-dimensional (3D) in shape, with low aspect ratio and strongly tapered blades. As such, the assumption of locally 2D flow is unlikely to apply. In this thesis the consequences of this assumption are explored, dividing 3D effects into two categories: 3D geometry …
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Contributions to the anisotropic elasto-plastic analysis of shells
… shell element that models the three-dimensional (3D) effects of surface tractions. The element is the widely used MITC4 shell element enriched by the use of a fully 3D stress-strain description, appropriate through-the-thickness displacements to model surface tractions, and pressure degrees of …
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Numerical Navier-Stokes solutions of supersonic slot injection problems
… potential reasons for the discrepancy including 3D effects and/or transition in the reattachment region in the experiments and possibly a need for a much finer grid in the calculations are discussed.
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A Hybrid Vortex Solution for Radial Equilibrium in Axial Compressors
… real axial velocity profiles, complete with 3D effects, into the early stages of design and incorporating it with the new vortex solution, this new design approach delivers airfoils that are better aligned to the real boundary conditions with enhanced surge and stability margins, which is …
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Turbulent Boundary Layer Flow Over a Bump
… often experience complex three-dimensional (3D) effects due to surface curvature and pressure gradients. These conditions introduce flow skewing, anisotropy, and deviations from classical equilibrium behavior, making them difficult to model and predict accurately. This thesis examines the …
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Volumetric analysis of lamprey hydrodynamics using synthetic aperture particle image velocimetry
… that lamprey locomotion arises from complex 3D flow field interactions, although this has never been studied using a live fish. To investigate the degree to which 3D effects are meaningful in lamprey hydrodynamics, SAPIV was used to study their unconstrained swimming in a quiescent tank more …
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Effects of fault failure parameterization and bulk rheology on earthquake rupture
… element method that approximately accounts for 3D effects while modeling a 2D geometry and explore the dependence of earthquake rupture risetime, steady state slip rate and speed, plastic energy release rate etc. on the initial stress state and plastic properties of the bulk material.
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Verification and Validation of Magnetohydrodynamics Simulations of Electrically Exploded Conductors
… to exit the liquid/vapor biphase--suggesting 2D/3D effects are significant for plasma formation. Experimental velocimetry measurements were used to validate the location of the vaporization curve in existing EOS models and differentiate between the vapor dome treatments. Dielectric coatings …
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Toward Efficient Bio-Inspired Propulsion: The Effect of Propulsor Shape and Kinematics on System Performance and Efficiency during Bio-inspired Locomotion
… that decompose the different kinematic and shape effects of these biological systems, we can understand what leads to their high cruising performance and efficiency. Two major studies were conducted. The first was on the effect of different kinematic parameters of large soaring birds on flight …
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Dynamics Of Internal Solitary Wave And Bottom Boundary Interaction
… also performed to study three-dimensionality (3D) of global instability. Our results agree with previous laboratory experiments, using the proposed pressure gradient parameter and Reynolds number. The 3D effects prevent the vortices from ascending as high as they do in 2D simulations. The …
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Conduction Plus Convection Heat Flow Modeling for the Linga Complex, Peruvian Coastal Batholith
… more robust software such as COMSOL to check effects of a more realistic porosity, variation in thermal conductivity, correctly estimating latent heat, better use of alteration data, fluid inclusion data, fractures, multiple intrusions, lower crust intrusions, magma convection, magmatic …
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High Efficiency IGBTs through Novel Three-Dimensional Modelling and New Architectures
… transistors are inherently three-dimensional (3D). Based upon a commercial IGBT, this thesis begins by outlining the development of a 3D TCAD model using design details provided by the manufacturer. Large variations between the experimental data from the manufactured device and the simulation …
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Efficient data structures for piecewise-smooth video processing
… methods such as object manipulation and special effects, rely on piecewise-smooth functions computed from the input data. In this thesis, we present two computationally efficient data structures for representing piecewise-smooth visual information and demonstrate how they can dramatically …
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Theoretical and experimental modelling of multiple site damage in plate components.
… approaches, which could incorporate the effects of the interaction between multiple cracks, 3D and other nonlinear phenomena. The primary objective of this study is to develop analytical and numerical models for the evaluation of the residual strength and fatigue crack growth of two …
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Development of an accurate 3D Monte Carlo broadband atmospheric radiative transfer model
… situations. This presents a need for accurate 3D spectral and broadband radiative transfer models to provide bounds on the interactions between clouds and radiation to judge the accuracy of similar but less expensive models and to aid in new parameterizations that take into account 3D effects …
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The impact of vertical variations of cloud mircrophysics and drizzle on the angular anisotropic behavior of weighted cloud droplet effective radius
… of our results is that other factors, such as 3D effects, cannot be ignored in the interpretation of MODIS Re bias.
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Characterization of performance-limiting flow mechanisms in a centrifugal compressor stage
… is modified to accommodate three-dimensional effects as source terms, these secondary flows are shown to detrimentally impact the diffuser pressure rise capability by accumulating high loss flow along the diffuser wall near the plane of symmetry between the vortices. This contributes to the …
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