Unsteady aerodynamics and vortex shedding of a wind turbine blade

The thesis presents an analysis of unsteady vortex shedding and vortex induced vibrations (VIV) on wind turbine blades using a combination of Stereoscopic Particle Image Velocimetry (SPIV) and Computational Fluid Dynamics (CFD). A spanwise uniform blade with a symmetric NACA0021 airfoil section, 0.075 m chord, and 0.4 m span was tested...

Vortex-Induced Vibrations of In-Line Cantilevered Cylinders: A Numerical Investigation for Nuclear Industry Benchmark Testing

The advent of global warming has brought an increased interest in non-conventional sources of energy, one of which is nuclear energy. Threatening the almost year-round functioning of nuclear power plants are Flow-Induced Vibrations (FIV). One such mechanism, Vortex-Induced Vibration (VIV), holds importance in areas of cross flow in nuclear power...

Global Dynamic Fluid-Structure-Interaction Analysis for a Submerged Floating Tunnel

This thesis aims to gain insight into the global dynamic fluid-structure interaction response of a submerged floating tunnel (SFT) under the wave and current loading to enhance the design. To this end, the tunnel tube is modelled as a Euler-Bernoulli beam deformed in three directions (horizontal displacement, vertical displacement, rotational...

Numerical simulation of a forced and freely-vibrating cylinder at supercritical Reynolds numbers

Recent innovations in the off-shore wind industry have lead to bigger wind turbines and taller support structures. These towers can suffer from vortex-induced vibrations (VIV). The present work couples the open-source CFD solver OpenFOAM with a structural solver to investigate these fluid-structure interactions (FSI) effects in more detail. 2D...

Modelling the vortex induced vibrations of sea fastened wind turbine towers using a wake oscillator

It is well known that for tall cylindrical structures under wind action, such as wind turbine towers, vortex induced vibrations (VIV) may occur. During the installation of offshore wind turbine towers there are different stages of transport where we might deal with VIV. The main objective of this thesis is to explore the possibility of modeling...

Modelling vortex-induced vibrations with a single wake oscillator coupled to both cross-flow and in-line motions

Vortex-induced vibration or as well-known as VIV is a phenomenon that has caught the attention of engineers along history. VIV is related to many engineering fields. In the offshore industry, it is of importance for risers that extract oil from the subsoil, and tethered anchors for floating units.<br/>The main aim of the thesis is to model the...

Technical feasibility assessment for hydrogen transport through existing offshore gas pipelines in the Dutch sector

In the last century, the offshore industry has installed a network of offshore pipelines in the southern North Sea. Due to decreasing oil and gas extraction in the North Sea, many pipelines of this network are becoming redundant. A potential option for the reuse of these pipelines is the transport and storage of gaseous hydrogen, which is...

Investigation of Vortex Induced Vibrations on Wind Turbine Towers

Vortex Induced Vibrations (VIV) is a well-known and explored topic. It is a quite complex phenomenon as it is part of different disciplines including fluid mechanics, structural mechanincs, vibrations and computational dynamics. It can be found in many engineering applications such as bridges, industrial chimneys, transmission lines, marine...

Dynamic behaviour of the Sognefjord bridge: Analysis and review of the world's largest floating bridge design

A project is under way to replace the ferry crossings in Norway's highway E39 with fixed links, such as highway bridges or tunnels. This thesis research is on the crossing located at the Sognefjord, the widest and deepest of the straight crossings in the E39 highway. Previous thesis projects at IV-Consult have yielded a design for a floating...

VIV analysis of a subsea power cable during installation in high current seas

Tideway is a marine solutions provider for the offshore oil &amp; gas and renewables and among other activities specialized in subsea power cable installation. To optimize the installation of power cables in high currents a better understanding of the dynamic behavior of the cables is needed. During installation of subsea power cables in high...

Numerical study of vortex-induced vibrations of a free-hanging slender structure with circular cross section using wake oscillator models

The aim of this work is to study the performance of the selected wake oscillator model in predicting the vortex-induced vibrations (VIV) response of a free-hanging vertical riser subjected to certain imposed harmonic oscillations at the top. This model is a simplification of the situations commonly found in offshore industries when a marine...

Motion Reconstruction of Vortex-Induced Vibration of Long Flexible Riser from Experimental and Field Test Data

Vortex-induced vibration (VIV) of long flexible cylindrical structures enduring ocean currents is ubiquitous in the offshore industry. Though significant effort has gone into understanding this complicated fluid-structure interaction problem, major challenges remain in modelling and predicting the response of such structures. The work presented...

Dynamic interaction of subsea pipeline spans due to vortex-Induced Vibrations

When currents are present around a subsea pipeline, vortices are shed alternately from the upper and lower sides of the pipe. The vortex shedding can induce vibrations in areas where the pipe is suspended above the seabed. These vibrations are called Vortex-Induced Vibrations (VIV). VIV have been and still are a cause of concern for pipeline...