Searched for: subject:"multiscale"
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Robijns, Michel (author)
This thesis is part of a greater effort to use machine learning for the development of flexible and universal unresolved-scale models in large eddy simulation (LES). The novelty in the current work is that a neural network learns to predict the integral forms of the unresolved-scale terms directly without a priori assumptions on the underlying...
master thesis 2019
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SUAREZ MILLAN, RUBEN (author)
With a fast increasing use of composite materials in aerostructures, industry demands design tools capable to reduce experimental tests while providing reliable data. Multiscale simulations enable to model and analyze fracture processes at the microscale, thus delivering higher accuracy and fundamental information about crack processes which...
master thesis 2018
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Giesen Loo, Erik (author)
Multiscale computational homogenization is an efficient method to upscale the microstructural behavior of micro-heterogeneous materials. In this method, a representative volume element (RVE) is assigned to a macroscale material point and the constitutive law for the macroscopic model at that point is obtained by solving a boundary value problem...
master thesis 2018
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Sharma, Abhishek (author)
A major challenge facing the study of bone regeneration today is the inability to mimic the tissue microenvironment and the factors comprising it. Organ-on-chip based microfluidic systems today aim at doing so by dynamically culturing living cells in them. These are preferred owing to their small feature sizes, laminar flows, high throughput,...
master thesis 2018
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de Zeeuw, Wessel (author)
Even though negative effects on the use of crude oil have surfaced over the past years, our energy matrix still largely relies on this energy source. The production of oil, therefore, plays an important role in our society. Unfortunately, the process of oil production is highly uncertain. There are uncertainties associated on the production...
master thesis 2018
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Arbarim, Rhadityo (author)
Accurate simulation of fluid flow and heat transfer in geothermal reservoirs is a crucial necessity for optimising energy extraction strategies. However, natural formations (including geothermal ones) extend large length scales (in the order of km), while their properties (e.g., heat and flow conductivity) can change in small (fine) scales (e.g....
master thesis 2018
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Sokolova, Irina (author)
We propose a multiscale finite volume method (MSFV) for simulation of coupled flow-deformation in heterogeneous porous media under elastic deformation (i.e., poroelastic model). The fine-scale fully resolved system of equations is obtained based on a conservative finite-volume method in which the displacement and pore pressure unknowns are...
master thesis 2018
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Xavier, Donnatella Germaine (author)
This Masters thesis is a new perspective on Large Eddy Simulation. The capability of goal oriented model constrained optimization technique to generate stable reduced order models without any additional stabilization term or subgrid scale modelling has been demonstrated. The low dimensional projection modes sought by the optimization program...
master thesis 2018
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de Jong, Gijs (author)
The effective fracture behavior of a fiber-reinforced composite depends on both the design and manufacturing of the material. During manufacturing several type of defects can occur. One of these defects are micro-voids on the sub-ply level. These can consist of either matrix voids or gaps between the fibers due to the inability of the resin to...
master thesis 2018
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Boitcov, Dmitrii (author)
Existing multiscale solvers use a sequence of aggressive restriction, coarse-grid correction and prolongation operators to handle low-frequency modes on the coarse grid. High-frequency errors are resolved by employing a smoother on the fine grid. Deflation preconditioning improves matrix properties, i.e., damps slowly varying errors,...
master thesis 2017
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Helici, Mircea (author)
master thesis 2017
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Praditia, Timothy (author)
Modern geoscience challenges motivate the development of advanced simulation methods for large-scale geothermal fields, where single- or multi-phase flow is coupled with heat transfer equation in heterogeneous fractured formations. The state-of-the-art multiscale formulation for fractured media (F-AMS; Tene et al., JCP, 2016) develops an...
master thesis 2017
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Stoter, Stein (author)
In this work the residual-based variational multiscale method is presented in a discontinuous Galerkin framework. This so-called ‘DG-RVMS’ strategy is developed, extensively verified, and tested on a more complex case.

The proposed DG-RVMS paradigm consists of three principle components. First, the perelement weak form is coupled by...
master thesis 2017
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Bosma, S.B.M. (author)
A novel multiscale method for discrete fracture modeling on unstructured grids (MS-DFM) is developed. To this end, the DFM fine-scale discrete system is constructed using unstructured conforming cells for the matrix with lower-dimensional fracture elements placed at their interfaces. On this unstructured fine grid, MS-DFM imposes independent...
master thesis 2017
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Kessels, P.C.J. (author)
The Reynolds-averaged Navier-Stokes equations are numerically solved in a segregated manner, along with the Spalart-Allmaras turbulence model. The Galerkin as well as multiple stabilized finite element formulations are derived for the Spalart-Allmaras turbulence model, and tested for robustness. For a turbulent channel flow and a backward facing...
master thesis 2016
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Van Hoorn, N. (author)
For failure in composite materials the fracture mechanisms at the microscopic scale, such as matrix cracking, fiber cracking, fiber-matrix debonding or combinations thereof determine the growth of crack at the macroscopic scale. The goal is to develop a simple failure criterion in terms of a bilinear Traction-Separation Law (TSL) for...
master thesis 2016
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Navarro Hernandez, L.C. (author)
The Large Eddy Simulation of high Reynolds number wall-bounded flows, has grid refinement requirements in near-wall regions similar to those of DNS. The feasibility of such computations is restricted by their elevated costs and therefore alternate solutions must be employed. While several methods to couple LES and RANS have been proposed, most...
master thesis 2015
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Shah, S.Y. (author)
This thesis proposes a novel multiscale method for simulating fluid flow in fractured porous media. Broadly speaking, this pertains to oil, gas and geothermal energy reservoirs.
master thesis 2015
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Torabi Kachousangi, F. (author)
Ray as the most historic city in Iran is an example of the neglected district that today religion shaped its identity and spatial configuration. In Fact the rapid growth of urbanization and migration in Tehran after the modernization, resulted polarization that affected on Ray, physically and socially and led to separate Ray from the rest of...
master thesis 2014
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Socha, W. (author)
This short summary helps to grasp the motive behind the research, its objectives and to find out what is presented on the following pages of the report. It offers a condensed, one page recapitulation of its contents and intentions and suggests who might be interested to read it. CONTEXT Map generalisation is a tedious task, requiring skilled...
master thesis 2012
Searched for: subject:"multiscale"
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