Searched for: subject%3A%22refinement%22
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Li, X. (author)
This thesis contributes to the effective and efficient application of unsteady adjoint methods to Adaptive Mesh Refinement (AMR) for Large Eddy Simulation (LES). Three aspects, i.e., subgrid-scale model error, storage cost of high-dimensional data, and stability of the adjoint problem for turbulent flows, were studied to make adjoint-based mesh...
doctoral thesis 2023
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Schiller, Carl (author)
In Geodesy, the development of accurate Digital Elevation Models of the surface helps to provide height data for various applications in other Earth Science disciplines. These models are used as base models for studies. Geophysics can be a support science when providing base models for non-invasive studies inside the Earth. Such models can be...
master thesis 2023
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Perez Bustos, Kevork (author)
Additive manufacturing (AM) refers to a series of techniques in which parts are created by successive deposition of layers. Among the different technologies, Wire Arc Additive Manufacturing (WAAM) employs a welding system in combination with a motion mechanism to deposit layers of molten metal. This technology possesses high deposition rates and...
master thesis 2023
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Veeravalli Hari, Akshath Ram (author)
In biomechanics, human movement studies are carried out to assess the subject’s kinematic and kinetic variables for a healthy gait. Currently, marker-based systems are the standardized method to extract the kinematic variables of subjects. The marker-based systems pose some serious challenges like cost and portability, and the calibration and...
master thesis 2023
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Morete Barbosa Bertolo, V. (author)
The use of materials in increasingly severe service conditions raises concerns about structural safety with respect to cleavage fracture. There are three main material-related challenges that structures face under harsh environments: 1) the trade-off between strength and toughness; 2) the ductile-to-brittle transition behaviour of BCC high...
doctoral thesis 2023
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Jiang, Quanxin (author), Morete Barbosa Bertolo, V. (author), Popovich, V. (author), Sietsma, J. (author), Walters, C.L. (author)
Study of the cleavage behavior of heat treated S690 steel by a microstructure-based approach combined with finite element analysis is present in this paper. Cleavage simulations of steels subjected to heat treatments that cause grain refinement or simulate heat affected zones are performed, and are compared with experiments. It is found that...
journal article 2023
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Ibrahimli, N. (author), Ledoux, H. (author), Kooij, J.F.P. (author), Nan, L. (author)
We propose an enhancement module called depth discontinuity learning (DDL) for learning-based multi-view stereo (MVS) methods. Traditional methods are known for their accuracy but struggle with completeness. While recent learning-based methods have improved completeness at the cost of accuracy, our DDL approach aims to improve accuracy while...
journal article 2023
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Mirhosseini, Seyed Hossein (author), Mosallaee, Masoud (author), Razavi, Mansour (author), Fotouhi, M. (author)
This paper aims to study the effect of adding different SiC content on the wear performance of Al<sub>2</sub>O<sub>3</sub>-TiB<sub>2</sub>-SiC ternary composite coatings produced by the air plasma spraying process. The study used SHS powders as primary materials, consisting of H<sub>3</sub>BO<sub>3</sub>, Al, and TiO<sub>2</sub>, and 5, 10,...
journal article 2023
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Hille, Helge C. (author), Kumar, Siddhant (author), De Lorenzis, Laura (author)
The numerical simulation of additive manufacturing techniques promises the acceleration of costly experimental procedures to identify suitable process parameters. We recently proposed Floating Isogeometric Analysis (FLIGA), a new computational solid mechanics approach, which is mesh distortion-free in one characteristic spatial direction....
journal article 2023
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Koullapis, Kendeas (author)
Over the last few years, the construction sector has experienced increasing demand for raw materials due to the rapid growth of the urban population. At the same time, most of the post-war buildings in Europe have reached the end of their service life. As a consequence, a period of intense demolition activities with<br/>significant waste...
master thesis 2022
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Halevy, Avi (author)
In this work residual error estimates are constructed using Neural Networks for Finite Element Method. These can be used to do adaptive mesh refinement. Two neural networks are developed the Multilayer Perceptron and the Transformer model. The error estimates are made for 1d poisson equations but the idea will generalise to higher dimensions as...
bachelor thesis 2022
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Cheekati, Vishnu (author)
In recent decades, high strength steels in thick sections have been increasingly used in offshore structures where they are subjected to harsh service conditions such as freezing temperatures and high static/dynamic loading. At these conditions they are susceptible to a transition from ductile failure to a dangerous brittle (cleavage)...
master thesis 2022
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Trabal, Guillem Gall (author), Bak, Brian Lau Verndal (author), Chen, B. Y. (author), Lindgaard, Esben (author)
A novel and efficient numerical formulation for the modelling of multiple delaminations growth in laminated composite materials subjected to quasi-static loading is presented. The proposed formulation alleviates the high computational cost associated with models featuring cohesive elements by using a novel Adaptive Refinement Scheme and an...
journal article 2022
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Trabal, Guillem Gall (author), Bak, Brian Lau Verndal (author), Chen, B. Y. (author), Carreras, Laura (author), Lindgaard, Esben (author)
A novel efficient numerical formulation for the analysis of multiple fatigue-driven delamination cracks is presented. A cohesive zone model is used in combination with an Adaptive Refinement Scheme (ARS) and an Adaptive Floating Node Method (A-FNM) element that refine the model effectively during the analysis. Novel techniques are proposed to...
journal article 2022
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Trabal, Guillem Gall (author), Bak, Brian Lau Verndal (author), Chen, B. Y. (author), Jensen, Simon Mosbjerg (author), Lindgaard, Esben (author)
A numerical study on toughening laminated composite materials against delamination by initiating multiple interlaminar cracks is presented. Different configurations of interface toughening and weakening patches, that modify the interface properties at selected locations, are investigated as a way to trigger multiple delaminations. Both...
journal article 2022
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Trabal, Guillem Gall (author), Bak, Brian Lau Verndal (author), Chen, B. Y. (author), Jensen, Simon Mosbjerg (author), Lindgaard, Esben (author)
A numerical study on the feasibility of using patches of interface weakening or toughening material to trigger multiple delaminations toughening laminated composite structures against delamination is presented. The studies use an adaptive refinement formulation that uses cohesive elements to model delamination initiation and propagation. A DCB...
conference paper 2022
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Hosseinimehr, S.M. (author)
In various geo-engineering fields, accurate and scalable modeling of fluid and heat transport in the subsurface fractured porous media is important in order to fulfill scientific, economical and societal expectations on successful field development plans. Such models and the predictions they provide, contribute to efficient and safe operations...
doctoral thesis 2021
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de Jong, Maarten (author)
The volume and density of geospatial data is constantly increasing as newer acquisition techniques are developed to create higher-resolution datasets and more countries are creating country-wide datasets such as point clouds. However, methods to deal with this increase in the amount of data are lagging behind and the developments in computer...
master thesis 2021
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Ran, Bo (author), Omikrine Metalssi, Othman (author), Fen-Chong, Teddy (author), Dangla, Patrick (author), Li, Kefei (author)
Three models are proposed for the sulfate diffusivity change due to the pore clogging by crystallization from the chemical sulfate attack of cement-based materials. The averaging model takes a linear relationship between the crystallization quantity and diffusivity change while the constriction model takes an inverse linear form and the self...
conference paper 2021
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Li, X. (author), Hulshoff, S.J. (author), Hickel, S. (author)
Adaptive mesh refinement (AMR) is potentially an effective way to automatically generate computational meshes for high-fidelity simulations such as Large Eddy Simulation (LES). Adjoint methods, which are able to localize error contributions, can be used to optimize the mesh for computing a physical quantity of interest (e.g. lift, drag)...
journal article 2021
Searched for: subject%3A%22refinement%22
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