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 20 for “"Front Propagation"”.
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Front Propagation and Feedback in Convective Flow Fields
… theory and numerical simulations to quantify the propagation of fronts, which consist of autocatalytic reaction fronts, fronts with feedback and pattern forming fronts in Rayleigh-Bénard convection. The velocity and geometry of fronts are quantified for fronts traveling through straight parallel …
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PDE models of front propagation in macroscopic physical systems
Submitted by Jenny Wong-Welch (wongwel2@illinois.edu) on 2011-11-10T23:52:10Z No. of bitstreams: 1 1993_paquette.pdf: 5940635 bytes, checksum: e52b7059425c22fbe1ca5dbc1471e76d (MD5)
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Condensation and Freezing Front Propagation on Surfaces With Topographic and Chemical Modifications
Experimental data on propagation were reported for a freezing front crossing on micro-grooved substrates in a 200mum-to-400mum-thick water layer. The speed of a freezing front oscillates locally over the grooves, with propagation retarded in troughs and accelerated on crests. When the water …
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An Analysis of Quench Front Propagation During Bottom Reflood of a heated Annular Channel
Made available in DSpace on 2017-07-06T18:49:01Z (GMT). No. of bitstreams: 3 Kimball_Kevin_D_MS.pdf: 72010837 bytes, checksum: b7112f4e2ed4b67c6244fc6a2a074f9f (MD5) Kimball_Kevin_D_MS_ABS.pdf: 820094 bytes, checksum: e1c23063ac37846e1ce48a616c0f2a6e (MD5) license.txt: 4813 bytes, checksum: …
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A phase field model for the gallium permeation of aluminum grain boundaries
… major hypotheses for the permeation mechanism: front propagation, and diffusion and coalescence. We have used phase field methods to develop a predictive model for the permeation of gallium through individual aluminum grain boundaries. The model uses location dependent grain boundary energy …
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Flames in Thin Channels
Finally, the flame front propagation in an adiabatic non-energetic channel is investigated. Specifically, the interaction of the flame front with the flow inside the channel is studied and the focus is to assess the thermal-expansion influence. It is found that thermal expansion enhances the …
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Fast Marching Methods - parallel implementation and analysis
… a very efficient technique for solving front propagation problems, which can be formulated as partial differential equations with Dirichlet boundary conditions, called Eikonal equation: $F(x)|\nabla T(x)|=1$, for $x \in \Omega$ and $T(x)=0$ for $x \in \Gamma$, where $\Omega$ is a domain …
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A quasi-dynamic and self-consistent rupture model to simulate earthquake ruptures
… in the dynamic rupture behaviour the rupture front propagation is calculated for incremental time steps based on the 2D Eikonal equation. The needed location-dependent rupture velocity field is assumed to scale linearly with a layered shear wave velocity field. At each time all boundary …
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Algorithms for Reconstruction of hidden 3D shapes using diffused reflections
… "around the corner". We analyze multi-bounce propagation of light in an unknown hidden volume and demonstrate that the reflected light contains sufficient information to recover the 3D structure of the hidden scene. We formulate the forward and inverse theory of secondary and tertiary …
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SPACE CHARGE LIMITED DIELECTRIC BREAKDOWN, OR: HOW I LEARNED TO STOP WORRYING AND LOVE APPROXIMATIONS
… is described by a new 1D space charge limited front (SCLF) model that reconceives breakdown as a propagating front rather than a diffuse event. To quantify embedded charge distributions and validate model predictions of breakdown charge transport, charge distributions produced in bulk PMMA by …
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Anisotropic dewetting in ultra-thin single-crystal silicon-on-insulator films
… new model. We also quantify the edge dewetting front propagation velocity in SOI and determine that it depends on the negative third power of the film thickness, agreeing with the prediction of Jiran and Thompson and with our model.
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Predictive Disintegration Process Modelling of Immediate Release Tablets Using Terahertz Technology
… is employed to investigate the advancing liquid front during tablet hydration, capturing liquid transport kinetics and matrix evolution insights. To capture disintegration realistically, including matrix erosion often ignored in constrained setups, a novel open immersion cell was developed for …
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Diffusion Tensor Imaging: Evaluation of Tractography Algorithm Performance Using Ground Truth Phantoms
… version of the FMT algorithm that is dubbed the Front Propagation Tractography (FPT) algorithm. The FPT algorithm includes unique approaches to the speed function, connectivity estimation, and likelihood estimation components of the FMT framework. The performance of the FPT algorithm is compared …
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Optimization-Based Methods for Reconstruction and Structural Quantification of Neurons and Glia from Microscopic Images
… for anisotropy, while MMS3D employs a front‑propagation algorithm that maximizes angular coherence along each trajectory to bridge discontinuities. Both methods outperform existing tools designed for tracing similar tubular structures. Electron microscopy (EM) imaging of neurons and …
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Unsteady flamelet progress variable modeling of reacting diesel jets
… the leading tip of the jet, followed by ignition front propagation toward the stoichiometric surface, and flame propagation upstream along the stoichiometric surface until the flame stabilizes at the lift-off height. The LES, on the other hand, predicts ignition at multiple points in the jet, …
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A Study of Instability Mechanisms Driving Cloud Cavitation: Experimental Analysis Using New Advanced Velocimetry and Evaluation of Numerical Models
… the shedding frequency and the condensation front propagation speeds (3.4-5.7 m/s) observed experimentally. This work establishes a robust, data-driven framework for analyzing multiphase flows, offering new predictive criteria for the design of robust hydraulic systems.
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Mathematical modelling of flow and combustion in internal combustion engines
… and proposes a new formulation of a flame-front model. Calculations have been performed for a one-dimensional test case and for a representative spark-ignition engine in order to determine the grid and time step requirements for numerical accuracy, the sensitivity of results to empirical …
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Collective Evolution of Biological and Physical Systems
… I study the evolution of solidification fronts propagating in undercooled liquids, the evolution of microbial communities through diversification fronts propagating along microbial genomes, the evolution of the universality and optimality of the genetic code, and the emergence of genome …
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Rapid on-demand polymerization for multifunctional materials
… typically expensive and difficult to scale up. Frontal polymerization (FP) has emerged as a rapid, energy-efficient, and easily scalable manufacturing technique for bulk polymeric materials, with significant potential to ease the manufacturing burdens of multifunctional polymer and composite …
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An Optimisation-Based Approach to FKPP-Type Equations
… use these bounds to study the speed of the wave front of the PDE in the case when $\mathcal{L}$ is the generator of a suitable Lévy process.