Browsing Institutt for marin teknikk by Author "Ulveseter, Jan Vidar"
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Advances in semi-empirical time domain modelling of vortex-induced vibrations
Ulveseter, Jan Vidar (Doctoral theses at NTNU;2018:135, Doctoral thesis, 2018)Most of today’s prediction tools for vortex-induced vibrations (VIV) operate in the frequency domain, where analysis is restricted to linear systems and steady flows. These modelling limitations provide an unsatisfactory ... -
In-Line Vibrations of Flexible Pipes
Ulveseter, Jan Vidar; Sævik, Svein (Chapter; Peer reviewed, 2017)A semi-empirical prediction tool for pure in-line vortex-induced vibrations is under development. The long-term goal is to be able to realistically model the dynamic behavior of free spanning pipelines exposed to arbitrary ... -
Non-linear time domain analysis of vortex induced vibrations
Ulveseter, Jan Vidar (Master thesis, 2015)In this thesis a model for nonlinear analysis of vortex induced vibrations (VIV), applied to free spanning pipelines, is proposed. The developed model takes into account the soil-pipe interaction. Through case studies, ... -
Simulating fundamental and higher harmonic VIV of slender structures
Ulveseter, Jan Vidar; Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article; Peer reviewed, 2019)Vortex-induced vibrations (VIV) of slender marine structures are complicated response processes, where a number of distinct frequency components might be simultaneously active. These are categorized as fundamental and ... -
Stochastic modelling of cross-flow vortex-induced vibrations
Ulveseter, Jan Vidar; Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article, 2017)Semi-empirical models are commonly used to predict vortex-induced vibrations (VIV). Empirical parameters are often based on forced harmonic motion tests of short rigid cylinders in one degree of freedom, which is a significant ... -
Time domain model for calculation of pure in-line vortex-induced vibrations
Ulveseter, Jan Vidar; Sævik, Svein; Larsen, Carl Martin (Journal article; Peer reviewed, 2017)A time domain model for prediction of cross-flow vortex-induced vibrations (VIV) of slender structures with circular cross section has been under development since 2012. As an extension of this work, a time domain model ... -
Time domain simulation of riser VIV in current and irregular waves
Ulveseter, Jan Vidar; Thorsen, Mats Jørgen; Sævik, Svein; Larsen, Carl Martin (Journal article; Peer reviewed, 2018)A semi-empirical prediction tool for time domain analysis of cross-flow and in-line vortex-induced vibrations (VIV) is proposed. The model combines concepts from previous publications in a new way, which allows for time ... -
Vortex Induced Vibrations of Pipelines With Non-Linear Seabed Contact Properties
Ulveseter, Jan Vidar; Sævik, Svein; Larsen, Carl Martin (Chapter; Peer reviewed, 2016)A promising time domain model for calculation of cross-flow vortex induced vibrations (VIV) is under development at the Norwegian University of Science and Technology. Time domain, as oppose to frequency domain, makes it ...