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 11 of 11 for “"multi-scale simulation"”.
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Framework for adaptive multi-scale simulation of textile reinforced concrete
… elements. The thorough understanding and simulation of the mechanical behavior of composites is still a demanding task. In TRC both the reinforcement and the concrete matrix exhibit heterogeneity on similar scales of resolution. The failure of matrix, reinforcement or bond causes a …
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Modeling of laminar-to-turbulent transition using a hybrid multi-scale simulation strategy
… the associated flow dynamics. Direct numerical simulation (DNS), although suitable for fundamental studies, tends to be computationally expensive, thus making large-eddy simulations (LES) a viable strategy. In LES, large scales of the flow field are computed, and the effects of small scales are …
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A Particle-Based Multi-Scale Simulation Procedure within the Material Point Method Framework
… have underscored the need for an effective multiscale procedure for simulating the responses of discrete nano and sub-micron structures and assemblies to various extreme loading conditions. In this dissertation, a particle-based multi-scale simulation procedure is proposed with a concurrent …
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Optical, electronic, and dynamical phenomena in the shock compression of condensed matter
… of shock waves that links the microscopic scale to the macroscopic scale, and basic questions regarding the role of crystallinity in the propagation of electromagnetic radiation in a shocked material. In Chapter 2, the nature of electronic excitations in crystalline solid nitromethane are …
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Multi-Scale Localized Perturbation Method for Geophysical Fluid Flows
… equations of a dynamical system, called the multi-scale localized perturbation method, is introduced and derived for the purpose of solving complex geophysical flow problems. Simulation variables are decomposed into background and perturbation components, then assumptions are made about the …
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Formation and growth of irradiation-induced defect structures in ceria
… experiments were designed by incorporating multiple techniques consisting of ion irradiation, in situ transmission electron microscopy (TEM) and ex situ TEM observation. Radiation damage in the materials was induced by irradiating them with krypton and xenon ions from an accelerator. …
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Three-dimensional multi-scale hydraulic fracturing simulation in heterogeneous material using Dual Lattice Model
Hydraulic fracturing is a multi-physics multi-scale problem related to natural processes such as the formation of dikes. It also has wide engineering applications such as extraction of unconventional resources, enhanced geothermal energy and carbon capture and storage. Current simulators are highly …
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Impact of morphology and confinement effects on the properties of aligned nanofiber architectures
The intrinsic and scale-dependent properties of nanofibers (NFs), nanowires, and nanotubes have made them the focus of many application-specific nanostructured materials studies. However, various NF morphology and proximity effects can lead to > 1000x reductions in the performance of NF-based …
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Novel materials, computational spectroscopy, and multiscale simulation in nanoscale photovoltaics
… materials as electrical contacts. Novel nanoscale materials introduce new paradigms for ultrathin, lightweight, solution processable PV as an alternative to conventional Si technology. For example, the ability to use deposition methods not viable in conventional inorganic PV is particularly …
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Development of a multi-scale projection method with immersed boundaries for chemically reactive flows and its application to examine flame stabilization and blow-off mechanisms
High-fidelity multi-scale simulation tools are critically important for examining energy conversion processes in which the coupling of complex chemical kinetics, molecular transport, continuum mixing and acoustics play important roles. The objectives of this thesis are: (i) to develop a …
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Effect of multifilament yarn crack bridging on uniaxial behavior of textile reinforced concrete
… particular, the material structure at the micro scale shows a high amount of irregularities and imperfections in the geometrical layout of the basic components and in the quality of local bindings between them. As a result, the damage localization process of TRC exhibits interactions between …