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 46 for “"finite-difference model"”.
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Finite difference model of an acoustic logging tool: the borehole in a horizontally layered geologic medium, A
Includes bibliographical references (pages 131-133).
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Bridge approach slab analysis and design incorporating elastic soil support
… of equations necessary for the analysis of finite bridge approach slabs (BAS) on elastic soil support is reported in this thesis. Results are compared for moments and shear forces governing the design for a wide range of values of soil elastic modulus ranging from dense sand to very loose …
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The effects of viscous stressed and mantle velocities on subduction : finite difference modeling
This thesis presents a two-dimensional finite-difference model of subduction, which is used to explore the characteristics of subduction that are most closely related to deformation in the overriding plate. The model focuses on how the angle, a, at which the slab subducts and the rate, Vr , at …
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Three-dimensional finite element modeling of two-phase fluid flow in deformable naturally fractured reservoirs.
… developed theoretical formulation and numerical model are validated against several cases where the analytical solutions or other model results are readily available. The performance of the numerical code is tested first by a couple of decoupled cases: elasticity and steady-state flow. The …
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Determination of AASHTO Bridge Design Parameters through Field Evaluation of the Rt. 601 Bridge: A Bridge Utilizing Strongwell 36 in. Fiber-Reinforced Polymer Double Web Beams as the Main Load Carrying Members
… and compare the field test results to a finite element and a finite difference model. It was found that diaphragm removal had a small effect on the wheel load distribution factor. Torsional and axial effects were small. The bridge response to multilane loading coincided with superimposed …
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Development of an energy storage tank model
A linearized, one-dimensional finite difference model employing an implicit finite difference method for energy storage tanks is developed, programmed with MATLAB, and demonstrated for different applications. A set of nodal energy equations is developed by considering the energy interactions on a …
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Spray characteristics of throttle body fuel injection
… numerical simulation using the FLUENT finite difference model.
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A finite difference forward model for MEG and EEG
In this thesis, I designed and implemented a model of the electromagnetic signals generated by the human brain as seen on magnetoencephalography and electroencephalography machines. The model makes a novel use of the principle of reciprocity combined with Ohm's Law and the Biot Savart Law to build …
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The Hydrogeology of Nags Head Woods, Dare County, North Carolina
… lake water levels by 1.5 m to 2.0 m.</p> <p>A finite-difference model (PLASM) was used to predict the effects of pumping from Fresh Pond.</p>
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Validation of a Noninvasive Blood Perfusion Measurement Sensor
… program that compares them to a biothermal finite difference model of the system. The program uses an iterative process incorporating Gauss Minimization to adjust parameters in the biothermal model until the predicted system behavior satisfactorily approximates the real world data. The …
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Mathematical Modeling of the Movement of Heat, Water, and Solutes in Two-Dimensional, Saturated-Unsaturated, Surface Water - Groundwater Flow Systems
… cross-sectional, saturated-unsaturated, finite difference model for simulating the movement of water, heat, and solutes in surface water-groundwater flow systems was developed. The model has been verified by comparison with analytical solutions and field results. The model was also used …
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Seismic performance of single-propped retaining walls
… under different seismic excitations using the finite difference software FLAC v7.0 (Itasca). The structure comprises two reinforced concrete diaphragm walls connected by a row of cross-lot struts that is used to support a 9.5m deep, 18m wide excavation in dry sand. After simulating the …
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A study of infiltration trenches in unsaturated soil
… distributions in soil calculated by Fok's model and a finite-difference model are compared for both the Ida silt loam soil and the Webster clay loam soil considering the capillary zone effect due to groundwater table. A computer program for hydrologic routing in infiltration trenches has …
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Cost Minimization for Hot Gas Defrost System
… up and defrost during normal operation. The finite difference method is used to numerically model the temperature of the coil during a defrost cycle. A separate model was developed to determine the pressure drop across evaporator coil with and without frost. Both models are used to determine …
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A theoretical study of the sea breeze
… and a mean stratification are used to model the sea breeze in two dimensions. the motion is forced by a prescribed surface temperature function. The linear model produces a sea breeze with realistic velocities and spatial dimensions. Hydrostatic solutions are found to differ very little …
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Wavelets and wavelet optimized-finite differences for electronic structure calculations
… few functions. Using the Wavelet Optimized Finite Difference Method (WOFD) [1], wavelets can also be used to determine a grid for finite difference calculations. In one dimension, starting with a guess for the wavefunction on a coarse grid with few points, an accurate solution on a nouniform …
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Thermal performance of a room with wall latent heat storage
… for transient thermal measurements. An explicit finite difference model was developed to simulate the transient heat transfer process in the walls with PCM gypsum board as inside lining. The model takes into account the transient boundary conditions, absorbed solar radiation, the melting/freezing …
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Heat and mass transfer within porous building materials
… that presented by Glaser in 1959. These simple models recognise moisture transport in vapour form only and do not allow information on material moisture content to be obtained directly. They are also based on the assumption that the material transport properties are independent of the prevailing …
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A Nondimensional Scaling Parameter for Predicting Pressure Wave Reflection in Stented Arteries
… of pressure wave reflections. A one-dimensional finite-difference model was developed to predict these reflections, and effects of variations in stent and vessel properties were examined, including stent stiffness, length, and compliance transition region, as well as vessel radius and wall …
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Thermal Overload Capabilities of an Electric Motor and Inverter Unit Through Modeling Validated by Testing
… unit. Empirical data was used to validate the model of the cold chamber and finalize the design. A lumped capacitance finite-difference model was developed to simulate the entire motor inverter assembly. The individual components of the thermal model were tested and the data was used to …
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