Browsing NTNU Open by Title
Now showing items 50313-50332 of 100783
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Isogeometric divergence-conforming variational multiscale formulation of incompressible turbulent flows
(Journal article, 2016)A new residual-based variational multiscale (RBVMS) formulation for incompressible turbulent flows is proposed that is suitable for discretization using divergence-conforming B-splines. The proposed methodology results in ... -
Isogeometric Finite Element Analysis based on Bézier Extraction of NURBS and T-splines
(Master thesis, 2011)This thesis will give a theoretical overview of B-splines, as well as NURBS and T-splines which are based on B-splines, and also the concept of Bézier decomposition of these spline functions. Bézier decomposition will ... -
Isogeometric Finite Element Analysis based on Bézier Extraction of NURBS and T-Splines
(Master thesis, 2011)Data transmission between finite element analysis (FEA) and computer-aided design (CAD) is ahuge bottle-neck today. Therefore, isogeometric analysis has been introduced with aim to merge these fields. While FEA utilizes ... -
Isogeometric Finite Element Analysis using B-spline Basis Functions: The Poisson Equation and the Biharmonic Equation
(Master thesis, 2013)In this thesis the finite element method with B-spline basis functions was implemented and tested for the Poisson equation and the Biharmonic equation in an isoparametric setting. The equations were solved on a unit square ... -
An isogeometric finite element-boundary element approach for the vibration analysis of submerged thin-walled structures
(Peer reviewed; Journal article, 2021)In this paper, the isogeometric formulations of the finite element and boundary element methods are applied to the dynamic analysis of thin-walled structures submerged in an infinite, inviscid, and incompressible fluid ... -
Isogeometric Kirchhoff-Love shell formulation for elasto-plasticity
(Journal article; Peer reviewed, 2018)An isogeometric thin shell formulation allowing for large-strain plastic deformation is presented. A stress-based approach is adopted, which means that the constitutive equations are evaluated at different integration ... -
Isogeometric methods for CFD and FSI-simulation of flow around turbine blades
(Journal article; Peer reviewed, 2015)Coupled fluid-structure interaction simulations of wind turbines have traditionally been considered computationally too expensive to carry out. However, more powerful computers and better solution techniques based on ... -
Isogeometric Methods for Computational Fluid Dynamics: Divergence-conforming Discretizations for the 2D Stokes Equations
(Master thesis, 2014)In this thesis we look at how boundary value problems for partial differential equations can be solved numerically using B-splines, or more generally NURBS, both to express the geometry of the problem exactly and as a basis ... -
Isogeometric Modeling and Experimental Investigation of Moving-Domain Bridge Aerodynamics
(Journal article; Peer reviewed, 2019)Computational fluid dynamics (CFD) and fluid–structure interaction (FSI) are growing disciplines in the aeroelastic analysis and design of long-span bridges, which, with their bluff body characteristics, offer major ... -
Isogeometric Phase-Field Methods for Modeling Fracture in Shell Structures
(Doctoral theses at NTNU;2021:87, Doctoral thesis, 2021)The simulation of the fracture of engineering structures is a challenging topic that requires accurate and efficient numerical models. This thesis focuses on the modeling of brittle and ductile fracture in thin shell structures ... -
Isogeometric Structural Analysis of Wind Turbine Blades
(Master thesis, 2018)Isogeometric analysis, IGA, seeks to bridge the gap between engineering design and computational analysis by using spline functions as finite element bases in the analysis framework. The general concept can be applied to ... -
Isogeometrisk analyse av Boussinesq ligningene
(Master thesis, 2016)In this master thesis, I have solved the Boussinesq equations with Isogeometric Analysis to study heat transfer coupled with air circulation. The Boussinesq equations consist of the Navier-Stokes equations and the ... -
Isolasjon; Trefiber vs mineralull Sammenlikning og vurdering av måleresultater fra test-hus på Huntonstranda samt livsløpsvurderinger
(Bachelor thesis, 2021)Oppgaven undersøker om trefiberisolasjonens hygrotermiske egenskaper vil påvirke varmegjennomgangen og redusere energibehov i bygg. Dette er gjort gjennom litteraturstudie og analyse av måleresultater fra testhus etablert ... -
Isolated and combined effects of high-intensity interval training and time-restricted eating on glycaemic control in reproductive-aged women with overweight or obesity: Study protocol for a four-armed randomised controlled trial
(Peer reviewed; Journal article, 2021)Introduction Overweight and obesity in reproductive aged women is a global problem due to the increased risk of subfertility, pregnancy complications and cardiometabolic diseases. High-intensity interval training and ... -
Isolated and combined effects of time-restricted eating and high-intensity interval training on glycemic control in reproductive-aged women with overweight/obesity: Preliminary findings from a randomized controlled trial
(Master thesis, 2020)Introduksjon. Fedme og insulinresistens er assosiert med en forhøyet risiko for diabetes type 2 og kardiovaskulære sykdommer. Strategier som innebærer diett og trening står i front i behandlingen mot fedme, for å forhindre ... -
Isolated and combined effects of time-restricted eating and high-intensity interval training on sleep quality in women with overweight or obesity
(Master thesis, 2021)Background: Sleep disorder is one of the leading risk factors for obesity and vice versa, and it is estimated that approximately one-third of the adult population has insufficient sleep. Time-Restricted Eating (TRE) and ... -
Isolated Full-Bridge DC-DC Converter Configurations for Photovoltaic Applications using Modular Multilevel Converter
(Master thesis, 2018)As a result of the continuously increasing carbon emissions, the global demand for cleaner energy is rising. Grid-connected photovoltaic (PV) systems is an attractive solution to provide green energy, and PV technology has ... -
Isolated Handwritten Character Recognition of Ancient Hebrew Manuscripts
(Journal article, 2022)Character recognition is widely considered an essential factor in preserving and digitizing historical handwritten documents. While it has shown a significant impact, the character recognition of historical handwritten ... -
Isolated High-Frequency Link PFC Rectifier With High Step-Down Factor and Reduced Energy Circulation
(Peer reviewed; Journal article, 2022)This article presents an isolated single-stage ac–dc high-frequency link full-bridge cycloconverter (HFLC) with high conversion ratio. Despite certain advantages, such topologies gen- erally suffer from transformer leakage ... -
Isolating the Black Box - Exploring the Effects of a Material Interface in Evolution in Materio
(Master thesis, 2015)Evolution in Materio (EiM) is the concept of exploiting intrinsic properties of various materials, or "black boxes", to perform computation. Motivation for EiM is multitudinous; new paradigms for computing, increased ...