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 113 for “"Numerical technique"”.
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Development of a numerical technique for modelling of multi-stage hydraulic fracturing in shale reservoirs
… unconventional reservoirs demands promoting techniques including horizontal well drilling and multi-stage Hydraulic Fracturing (HF) stimulation. What significantly affects the fractures arrangement, and associated geometries is the stress field changes, referred to as “stress shadowing”. In …
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The Fourier Transform Used as a Numerical Technique for The Solution of Transient Vibration Problems
Made available in DSpace on 2014-12-10T17:25:40Z (GMT). No. of bitstreams: 1 6808023.pdf: 2361276 bytes, checksum: efcc7a2063b189d382e16bccca475051 (MD5) Previous issue date: 1967
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Study of Electromagnetic Scattering from Randomly Rough Ocean-Like Surfaces Using Integral-Equation-Based Numerical Technique
A numerical study of electromagnetic scattering by one-dimensional perfectly conducting randomly rough surfaces with an ocean-like Pierson-Moskowitz spectrum is presented. Simulations are based on solving the Magnetic Field Integral Equation (MFIE) using the numerical technique called the Method of …
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Behaviour of continuous concrete slabs reinforced with FRP bars. Experimental and computational investigations on the use of basalt and carbon fibre reinforced polymer bars in continuous concrete slabs.
… slabs tested. On the analytical side, a numerical technique consisting of sectional and longitudinal analyses has been developed to predict the moment¿curvature relationship, moment capacity and load-deflection of FRP reinforced concrete members. The numerical technique has been validated …
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Mathematical Modeling and Scanning Electron Microscopic Study of Biofilm on Adsorptive Media (Orthogonal Collocation Method)
… diffuses in a layered-media. An advanced numerical technique, the Global Orthogonal Collocation Method, was employed to solve the model.
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Part I: Proximity effect; numerical evaluation of Tc. Part II: Derivation of Boltzmann type transport equation for an impure anisotropic superconductor
… superconducting materials have been s9lved via a numerical technique. Thia is based upon a variation approach used by Silvert and Cooper. The solution indicates that the approximate anlytical procedure used by Werthamer is accurate ,for thick-dirty films. However, for thinner-cleaner films, his …
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Efficient solutions of 2-D incompressible steady laminar separated flows
… thesis describes a simple efficient and robust numerical technique for solving two-dimensional incompressible laminar steady flows at moderate-to-high Reynolds numbers. The method uses an incremental multigrid method and an extrapolation procedure based on minimum residual concepts to accelerate …
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Numerical Study of Plasmon Resonances in Nanoparticles
… significance. In this dissertation, a new numerical technique to fully characterize the plasmon resonances in three-dimensional nanoparticles is presented. In this technique, the problem of determining the plasmon resonant frequencies is framed as an integral equation based eigenvalue …
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Modeling the biodegradation kinetics of dissolved organic contaminants in a heterogeneous two-dimensional aquifer
… solving each with an appropriate method, was the numerical technique chosen because of the ease at which different biodegradation kinetic models can be changed. The differences between the Monod and biofilm kinetic models were shown to be negligible by model simulations and dimensionless analysis …
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Analysis of Dielectric Waveguides and Microstrip Lines Using Krylov Subspace-Based Techniques
… by using Krylov subspace-based reduction techniques to solve the sparse matrix equation. The numerical technique is also extended to analyze single and multiple discontinuities in the waveguiding structure. Finally, some preliminary work is done on truncation of the computational domain …
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Optimizing Parameters and Controls for Maneuvering Flexible Structures
… for the general problem are defined and a numerical technique for the solution is discussed. Implementing the numerical solution is shown to be practical using reduced-order structural models. Optimal controls are smoothed by including control derivative penalties in order to allow terminal …
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Optimization of microwave devices
This thesis deals with the optimization techniques for the improvement of the microwave devices performance. In particular, the technique proposed considers the Particle Swarm Optimization algorithm and applies such an algorithm to different devices. Different techniques are developed to connect …
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Analysis of computer communication systems by use of digital signal processing methods
… problems, by use of digital signal processing techniques, are presented. The z-transform of the queue length distribution for the Mj GY jl system is derived. Two numerical methods for the inversion of the transfom, together with the standard numerical technique for solving transforms with …
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Wave propagation in lossy waveguide structures
In this thesis a numerical technique is developed determining the propagation constant in waveguides and transmission lines. The technique accounts for both dielectric and conductor losses in a guide having an arbitrary cross section and uses a full-wave solution process. A set of coupled, vector …
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A stage-by-stage post-stall compression system modeling technique: methodology, validation, and application
… as surge and rotating stall. The model uses a numerical technique to solve the nonlinear conservation equations of mass, momentum, and energy. Inputs for blade forces and shaft work are provided by a set of quasi-steady stage characteristics modified by a first order lagging equation to …
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The Application of Improved Numerical Techniques to 1-D Micellar/Polymer Flooding Simulation
Three examples of three phase flow models which have been developed are compared under various conditions. Although the dif-ference in oil recovery and surfactant trapping among the models was rather large with constant. salinity, a salinity gradient produced high oil recovery and low surfactant …
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Induced seismicity analysis for reservoir characterization at a petroleum field in Oman
… and June 2001 in a producing field in Oman. A numerical technique is applied to "collapse" the relocated hypocenters and to find the simplest structural interpretation consistent with the data. Comparing the methods, the applicability of waveform correlation methods such as the …
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Accelerating a Coupled SPH-FEM Solver through Heterogeneous Computing for use in Fluid-Structure Interaction Problems
… (FEM) solver. SPH is a mesh-free, Lagrangian numerical technique frequently employed to study physical phenomena involving large deformations, such as fragmentation or breaking waves. As a mesh-free Lagrangian method, SPH makes an attractive alternative to traditional grid-based methods for …
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Developments in the method of finite spheres : efficiency and coupling to the traditional finite element method
… of finite spheres which is a truly meshless numerical technique for the solution of boundary value problems on geometrically complex domains. We present the development of a preprocessor for the auto-generation of finite spheres on two-dimensional computational domains. The techniques enable …
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Solution of non-linear partial differential equations with the Chebyshev Spectral method
The Spectral method is a powerful numerical technique for solving engineering differential equations. The method is a specialization of the method of weighted residuals. Trial functions that are easily and exactly differentiable are used. Often the functions used also satisfy an orthogonality …
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