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 36 for “"Three-Dimensional Effects"”.
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Three-dimensional effects on flag flapping dynamics ; [and], Study and modeling of incompressible highly variable density turbulence in the bubbly wake of a transom stern
… first part of the flapping studies, we examine three-dimensional effects on the flapping dynamics of a flag, modeled as a thin membrane, in a uniform fluid inflow. We consider periodic span-wise variations of length (ignoring edge effects) characterized by discrete span-wise wavenumber. Using …
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Prediction of the beamformed acoustic ray arrival structure for the 1992 Barents Sea coastal tomography test
… vertical hydrophone array was simulated based on three-dimensional ray theory. based on three- dimensional ray theory. Through numerical raytracing, followed by eigenray searches and estimations of ray amplitudes, searches and estimations of ray amplitudes, phases and travel times, the arrival …
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Effect of 3D stress states at crack front on deformation, fracture and fatigue phenomena
… These simplifications essentially reduce the dimensionality of the physical three-dimensional problem and enable the achievement of effective analytical and numerical solutions for many important practical problems. The influence of various three-dimensional effects, such as the variation of …
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Estudo do comportamento de lastros de materiais granulares sobre estacas com capitéis através de modelos reduzidos
… material, external pressure, and two - and three - dimensional effects. The behaviour observed in the model were compared with that predicted by available theoretical methods. The following points were observed: i) the density of the base is an important factor; ii) the external pressure is …
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Skin friction measurements around a wing-body junction using oil- film laser interferometry
… to correct measurement errors arising from three-dimensional effects and pressure gradients. The oil-film, dual-beam laser interferometer was constructed to measure the skin friction around a wing-body junction in a three-dimensional, turbulent boundary layer with pressure gradients. The …
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Measurements of surface shear stresses under a three-dimensional turbulent boundary layer using oil-film laser interferometry
… magnitude and direction are reported for a three-dimensional, pressure driven, turbulent boundary layer around a wing body junction. Measurements were made using a dual-beam oil film laser interferometer at 56 locations. An iterative procedure was developed which increased the precision of …
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Afterbody drag prediction for conceptual aircraft design
… These drag deltas account for various geometric effects and three-dimensional effects. The resulting prediction method is applicable to both axisymmetric and 2-D nozzles. The hybrid approach has been incorporated into ACSYNT Version 2.0.0 (AirCraft SYNThesis), a conceptual aircraft design tool …
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A beam test for adhesives
… adhesives, a modified specimen is proposed. Three-dimensional effects through the thickness of the adhesive layer are studied with the program ABAQUS. Experiments were performed using the two methods derived from theory and good correlation between theory and experiment were obtained with …
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An Experimental Study of Formation of Circulation Patterns in Laminar Unsteady Driven Cavity Flows Using Particle Image Velocimeter (PIV) Techniques
… sphere particles 10 microns in diameter, at three different lid velocities leading to Reynolds numbers in the high laminar to transitional range. Driven Cavity Flow is a classic fluid dynamics case often used for benchmarking of computational codes. Previous work has primarily focused on …
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Three-dimensional nonequilibrium viscous shock-layer flow over the space shuttle orbiter
… method has been developed to predict the three-dimensional nonequilibrium flowfield past the space shuttle orbiter at high angles-of-attack (up to 50-deg). An existing viscous shock-layer method for perfect gas flows has been extended to include finite-rate chemical reactions of …
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Clean Wing Airframe Noise Modeling for Multidisciplinary Design and Optimization
… and length scales that are obtained from three-dimensional, steady, RANS simulations with a two- equation k-omega turbulence model. The noise metric is not the absolute value of the noise intensity, but an accurate relative noise measure as shown in the validation studies. One of the …
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Hydrofoil shape optimization by gradient methods
… was developed based on the extension of a two-dimensional potential flow solution to account for three dimensional effects. Prandtl's lifting line theory was used to account for induced drag and downwash at the leading edge of the foil. Strip theory was used to extend the two-dimensional wave …
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Measurements and Visualizations of a Three-Dimensional Compressible Base Flow
… cylindrical objects inclined at angle-of-attack. Three-dimensional effects in the developing afterbody boundary layer result in significantly faster growth of the boundary layer in the leeward plane compared to the windward plane. In the base region, a very short recirculation region is measured, …
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Three-Dimensional Loss Effects of a Solenoidal Inductor with Distributed Gaps
… detailed explanation is provided on the 3D loss effects, along with the recommended design considerations and a method to estimate the dominant 3D loss effect using simple 2D simulations. The design recommendations address a 26-fold increase in the core loss of the outer ferrite rings. They also …
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SPACE CHARGE LIMITED DIELECTRIC BREAKDOWN, OR: HOW I LEARNED TO STOP WORRYING AND LOVE APPROXIMATIONS
… arising from multi sign charge configurations, three dimensional effects, and transient breakdown pathways were identified, and the necessity for multidimensional numerical simulations to extend and refine the SCLF framework for spacecraft relevant geometries was outlined. Together, these …
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Revealing interior structure of planetary bodies from their tidal response
… on density. We examine the influence of common three-dimensional effects, such as surface topography, crustal thickness, and heterogeneous mantle structure on the tidal response and compute sensitivity kernels with respect to elastic parameters and density. To achieve this, we implemented an …
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Thermoacoustic Effects of a Variable Equivalence Ratio in a Single Element Methane Combustor
… damage. In this project, the thermoacoustic effects of controlling the equivalence ratio of a single-element natural gas combustor were modeled and analyzed. The project used Fidelity Pointwise for meshing, ANSYS Fluent for modeling, ERAU VEGA HPC for computing, and MATLAB for acoustic …
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Covering Shock Wave Induced Interfacial Mixing: Numerical Study and a Control Primer
… Simulations are implemented for the two dimensional case of a cylindrical shock wave convergently approaching an initially wave-like perturbed density discontinuity formed by a target of Sulfur Hexauoride immersed into unshocked air with Atwood number of 0.67. The perturbation is varied …
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Optimization of the Aerodynamics of Small-scale Flapping Aircraft in Hover
… </p><p>In this dissertation, I will present three different methods of optimization for flapping flight with an emphasis on hovering with each their advantages and drawbacks. The first method was developed by Hall et al. It is an extremely fast and powerful three-dimensional approach. …
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Measurements and Predictions of Heat Transfer for a First Vane Design
… of a scaled-up stator vane. Understanding the three-dimensional effects of contoured endwalls on vane heat transfer can lead to prolonging blade life. The results of a combined experimental and computational study of heat transfer along the surface of a turbine vane that incorporates a …
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