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 47 for “"field modeling"”.
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Phase-field Modeling of Phase Change Phenomena
The phase-field method has become a popular numerical tool for moving boundary problems in recent years. In this method, the interface is intrinsically diffuse and stores a mixing energy that is equivalent to surface tension. The major advantage of this method is its energy formulation which makes …
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Coupled Field Modeling of Gas Tungsten Arc Welding
… fluid flow in the weld pool on the temperature field of the welded joint. Previous research has established that the weld pool depth/width (D/W) ratio and Heat Affected Zone (HAZ) are significantly altered by the weld pool dynamics. Hence, for a more accurate estimation of the thermally-induced …
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Electric field modeling of outdoor insulator for optimized performance
This project presents the study of electric field stress along the surface of a 132 kV ceramic post insulator. Insulators are among the important devices of the electric power transmission systems. They are used to support and separate conductors at high voltage. Different insulator shapes have …
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Phase field modeling of the defect evolution and failure
… <p>In the first part of the work, a phase field dislocation dynamics (PFDD) approach is introduced, which tracks the evolution of the dislocations in ultrafine and nano grained metals and takes into account the elastic interaction between dislocations, obstacles and the applied resolved …
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Stochastic inversion for core field modeling using satellite data
Magnetfeldmodellierung mit Kugelflächenfunktionen basiert auf der Inversion nach hunderten bis tausenden von Parametern. Dieses hochdimensionale Problem kann grundsätzlich als ein Optimierungsproblem formuliert werden, bei dem ein globales Minimum einer gewissen Zielfunktion berechnet werden soll. …
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Phase Field Modeling of Grain Growth in Porous Polycrystalline Solids
… This has motivated us to develop a novel phase field model to investigate the process of grain growth in porous polycrystalline solids. Based on a dynamical system of coupled Cahn-Hilliard and Allen-Cahn equations, the model couples the curvature-driven grain boundary motion and the migration of …
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Phase field modeling of dynamic brittle fracture at finite strains
… of these cracks. One method is the phase field approach, which approximates sharp crack discontinuities with a continuous scalar field, the so-called phase field. The latter represents the smooth transition between the intact and broken material phases. The evolution of the phase field due …
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Random field modeling for interpretation and analysis of layered data
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1987.
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Quantitative phase-field modeling of crack propagation in multi-phase materials
… ceramics (UHTCs). A quantitative phase-field model based on the regularized formulation of Griffith’s theory is presented for crack propagation in homogenous and heterogeneous brittle materials. This model utilizes correction parameters in the total free energy functional and mechanical …
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Phase-Field Modeling of Oscillatory Wetting Phenomena with Contact Angle Hysteresis
… quasi-static experiments. Here we use a phase-field model of dynamic wetting which directly includes the contact angle hysteresis to simulate the results of the aforementioned authors. A thorough derivation of the governing equations is presented, starting from the pioneering work of Cahn and …
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Multi-level, multi-variate, non-stationary, random field modeling of engineering systems
… multi-variate, non-stationary, random field formulations for the modeling of system properties. To consider the inhomogeneous spatial variability, this study proposes a regressor-based random field formulation using an improved latent space approach (ILSA). To considers the intra-level …
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Markov random field modeling of the spatial distribution of proteins on cell membranes
… simultaneously. As a solution, Markov random field (MRF) modeling is proposed to reconstruct the distribution of multiple cell membrane constituents from pair-wise data sets. MRFs are a powerful mathematical formalism for modeling correlations between states associated with neighboring sites …
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Phase-field modeling of fracture: regularization length insensitivity and mixed mode ductile fracture
… Among computational fracture models, the phase-field modeling approach has emerged as a superior model to overcome the discontinuities associated with cracking. However, we identified a number of shortcomings with existing models, namely in the sensitivity of phase-field model predictions to the …
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Methodologies for electromagnetic field modeling for computer aided analysis of multi-domain physical interactions
… are presented in this work to facilitate the modeling of electromagnetic fields in the context of multi-domain physical interactions. Among the challenges for computer aided analysis of electromagnetic problems in interaction with other physical phenomena are the largely different temporal and …
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Discovering non-equilibrium mechanisms that regulatestructure and function of biomolecular condensates usingphase-field modeling
… and function of biomolecular condensates. Phase-field modeling is used for these investigations, as this approach has been historically successful in answering similar questions in other fields such as material science. Prior work shows that proteins present in biomolecular condensates associated …
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Development of stable operator splitting numerical algorithms for phase-field modeling and surface diffusion applications
… to create Allen-Cahn and Cahn-Hilliard phase field models. Individual terms of the conservation equations were approached by different methods using operator splitting techniques found in previous literature. In addition, dewetting of gold films due to surface diffusion was modeled to present …
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Electromagnetic Field Modeling of Transcranial Electric and Magnetic Stimulation: Targeting, Individualization, and Safety of Convulsive and Subconvulsive Applications
… is the similar. Namely, an electromagnetic field is induced in the brain either via current injection through scalp electrodes or via electromagnetic induction. The induced electric field modulates the neuronal transmembrane potentials and, thereby, neuronal excitability or activity. …
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Phase-field modeling of liquids splitting between separating surfaces and its application to high-resolution roll-based printing technologies
… quality printing. In this study, the phase-field method is investigated to characterize the liquid bridges in roll-based printing systems. Phase-field models of two-phase flow systems are being used increasingly often in a variety of applications ranging from microfluidics to turbulent …
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A geologic and potential field investigation of the central Virginia Piedmont
… Zone. Detailed geologic mapping and potential field modeling shows that the character of the Piedmont gravity high is a result of both crustal thickness variation and density contrasts between the surficially exposed lithologies. Geologic, gravity and magnetic field modeling has determined the …
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MESOSCALE MICROSTRUCTURE EVOLUTION, RELIABILITY AND FAILURE ANALYSIS OF HIGH TEMPERATURE TRANSIENT LIQUID PHASE SINTERING JOINTS
… the effect of each factor. In this work, phase field modeling of the microstructure of TLPS materials fabricated by different processing methods will be conducted. Phase-field modeling (PFM) is a powerful thermodynamic consistent method in mesoscale modeling that simulates the evolution of …
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