Browsing NTNU Open by Author "Helgedagsrud, Tore Andreas"
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A comparative study of beam element formulations for nonlinear analysis: corotatinal vs. geometrically exact formulations
Mathisen, Kjell Magne; Bazilevs, Yuri; Haugen, Bjørn; Helgedagsrud, Tore Andreas; Kvamsdal, Trond; Okstad, Knut Morten; Raknes, Siv Bente (Chapter, 2017)In this work the geometrically exact three-dimensional beam theory has been used as basis for development of a family of isoparametric higher order large deformation curved beam elements. Geometrically exact three-dimensional ... -
ALE-VMS methods for wind-resistant design of long-span bridges
Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Mathisen, Kjell Magne; Øiseth, Ole (Peer reviewed; Journal article, 2019)For unsteady aerodynamics, the Arbitrary Lagrangian-Eulerian Variational Multi-Scale (ALE-VMS) formulation for incompressible flows has proven an accurate and powerful method. In this paper we present an overview of some ... -
Computational and experimental investigation of free vibration and flutter of bridge decks
Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Mathisen, Kjell Magne; Øiseth, Ole (Journal article; Peer reviewed, 2018)A modified rigid-object formulation is developed, and employed as part of the fluid–object interaction modeling framework from Akkerman et al. (J Appl Mech 79(1):010905, 2012. https://doi.org/10.1115/1.4005072) to simulate ... -
Isogeometric Modeling and Experimental Investigation of Moving-Domain Bridge Aerodynamics
Helgedagsrud, Tore Andreas; Akkerman, Ido; Bazilevs, Yuri; Mathisen, Kjell Magne; Øiseth, Ole (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 ... -
Modeling and Simulation of Bridge-Section Buffeting Response in Turbulent Flow
Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Mathisen, Kjell Magne; Yan, Jinhui; Øiseth, Ole (Peer reviewed; Journal article, 2019)Buffeting analysis plays an important role in the wind-resistant design of long-span bridges. While computational methods have been widely used in the study of self-excited forces on bridge sections, there is very little ... -
On Locking-free Methods for Isogeometric Large Deformation Analysis of Geometrically Exact 3D Timoshenko Beams
Helgedagsrud, Tore Andreas (Master thesis, 2015)In this thesis the geometrically exact 3D shear-flexible beam model is discretized with the Lagrangian and the NURBS basis functions, and has been used as a basis to develop a family of locking-free NURBS-based elements. ... -
Using ALE-VMS to compute aerodynamic derivatives of bridge sections
Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Korobenko, Artem; Mathisen, Kjell Magne; Øiseth, Ole (Journal article; Peer reviewed, 2018)Aeroelastic analysis is a major task in the design of long-span bridges, and recent developments in computer power and technology have made Computational Fluid Dynamics (CFD) an important supplement to wind tunnel experiments. ... -
Using ALE-VMS to compute wind forces on moving bridge decks
Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Korobenko, Artem; Mathisen, Kjell Magne; Øiseth, Ole (Chapter, 2017)A framework for simulating the forced-vibration wind tunnel experiment using stabilized ALE-VMS techniques has been developed. With a user-defined motion of the bridge deck the problem reduces to a flow computation on a ... -
A variational multiscale framework for atmospheric turbulent flows over complex environmental terrains
Ravensbergen, M.; Helgedagsrud, Tore Andreas; Bazilevs, Yuri; Korobenko, Artem (Peer reviewed; Journal article, 2020)A residual-based variational multi-scale (VMS) modeling framework is applied to simulate atmospheric flow over complex environmental terrains. The VMS framework is verified and validated using two test cases using linear ... -
Wind forces on bridge decks using state-of-the-art FSI methods
Helgedagsrud, Tore Andreas (Doctoral theses at NTNU;2019:180, Doctoral thesis, 2019)Several bridges with span widths that challenge present technology are currently under planning in Norway, and wind effects are among the major concerns. Traditionally, wind-structure interactions are studied experimentally ...