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 23 for “"Multiscale Methods"”.
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Multiscale methods for transport phenomena
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-03-13 without embargo terms
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Multiscale methods for fabrication design
… design process of fabricable objects by using multiscale methods. Our method computes coarse-scale simulation meshes with data-drive material models. It improves the simulation efficiency while preserving the characteristic deformation and motion of elastic objects. The first step in our method …
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Multiscale methods for the segmentation of images
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1996.
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Efficient multiscale methods for micro/nanoscale solid state heat transfer
In this thesis, we develop methods for solving the linearized Boltzmann transport equation (BTE) in the relaxation-time approximation for describing small-scale solidstate heat transfer. We first discuss a Monte Carlo (MC) solution method that builds upon the deviational energy-based Monte Carlo …
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Simulation of Rarefied Flows in MEMS Devices by Atomistic and Multiscale Methods
… cost associated with such analysis, multiscale coupling of DSMC with the continuum models for fluid flow is studied. The Schwarz alternating method is utilized for coupling, and the continuum equations are solved using the finite cloud method. The agreement of the coupled method with …
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Multiscale methods for the analysis and application of fractal point processes and queues
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Modeling Droplet Impingement Dynamics on Micropillar-Arrayed Viscoelastic Substrates Through Microgeometry-Free and Multiscale Methods
… thoroughly investigated by two distinct modeling methods, i.e., microgeometry-free and multiscale modeling methods. The viscoelasticity of the micropillar-arrayed substrate is characterized by a five-parameter generalized Maxwell model via the Laplace-Carson transform. In the microgeometry-free …
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Multiscale Modeling and Simulation of Turbulent Geophysical Flows
… geophysical flow computations, several types of multiscale methods were systematically developed and tested for a variety of physical settings including barotropic and stratified wind-driven large scale ocean circulation models, decaying and forced two-dimensional turbulence simulations, as well …
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Closure Modeling for Accelerated Multiscale Evolution of a 1-Dimensional Turbulence Model
… This study presents an innovative equation-free multiscale approach combined with a machine learning technique to address this challenge in the context of the one-dimensional stochastic Burgers' equation, a widely used toy model for turbulence. We employ an encoder-decoder recurrent neural …
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Multiscale and Dirichlet Methods for Supply Chain Order Simulation
… in that it relies extensively on Dirichlet and multiscale methods to tackle supply-chain order simulation. Multiscale model methodology is furthered to include Dirichlet models which are used to simulate order times for each customer and the collective system on different scales.
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Continuum and Atomistic Simulation of Electrically-Mediated Flow Through Nanometer Channels
… wall. As a final result, we present embedding multiscale methods which efficiently combine an atomistic model near the channel wall with the classical theory for the central part of the channel. The multiscale models can also be used to explain the anomalous behavior observed in …
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A Multiscale Method for Simulating Fracture in Polycrystalline Metals
… motivates the formulation of computational multiscale methods to link macroscopic failure to the underlying atomic processes from which all material behavior originates. A combined concurrent and sequential multiscale methodology is developed to analyze fracture mechanisms across length …
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DIRECTIONAL MULTISCALE ANALYSIS USING SHEARLET THEORY AND APPLICATIONS
… overcoming the limitations of traditional multiscale methods. Particularly, shearlets have proved to be very effective in handling directional features compared to ideas based on separable extension, used in multi-dimensional Fourier and wavelet analysis. In order to efficiently deal with …
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Stabilized Finite Element Formulations for Flow Problems
… method for mixed finite elements, monolithic methods for nonlinear problems require consistent linearization. One of the main contributions of the work is a consistent linearization of a variational multiscale formulation for incompressible Navier-Stokes. We compare the convergence of this …
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Results on the interaction between atomistic and continuum models
… relations for continuum models, and robust multiscale methods for studying systems with multiple length and time scales. We use a unified framework to study the Irving--Kirkwood and Murdoch--Hardy procedures used to obtain definitions for continuum fields in atomistic systems. We identify …
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A variational multiscale computational framework for reaction-dominated thermo-chemo-mechanical process modeling in multi-constituent material systems
… (i) new robust variational multi-scale numerical methods that are consistently derived, and (ii) models for multi-physics processes in multi-constituent materials. New robust numerical methods are developed via the variational multiscale (VMS) framework. Through the concept of fine scales in VMS, …
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Bridging the gap between atomistic and continuum models to predict dielectric and thermodynamic properties of confined fluids
… at atomic level. Thus, there is a need for a multiscale frame work to maintain the balance between accuracy and rigor of atomistic simulations and efficiency of continuum frameworks. In this work, we present an empirical potential-based quasi-continuum theory (EQT) that provides a framework to …
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Transport maps for accelerated Bayesian computation
… inference in large-scale inverse problems with multiscale structure. Multiscale structure is expressed as a conditional independence relationship that is naturally induced by many multiscale methods for the solution of partial differential equations, such as the multiscale finite element method …
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Propagation of Ultra-High Energy Cosmic Rays and anisotropy studies with the Pierre Auger Observatory: the multiscale approach
… observed above 5x10^19 eV. The method involves a multiscale procedure, based on information theory and extreme value statistics, providing high discrimination power, even in presence of strong background isotropic contamination. It is extended to allow correlation analysis with catalogues of …
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A multiscale approach to state estimation with applications in process operability analysis and model predictive control
This thesis explores the application of multiscale ideas to the areas of state estimation and control. The work represents a significant departure from the traditional representations in the time and frequency domains, and provides a novel framework that leads to fast, efficient, and modular …
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