Thesis

Hydrodynamic design aspects of tension leg platforms for wind turbines

Creator

Oguz, Elif

Rights statement

Strathclyde Thesis Copyright

Awarding institution

University of Strathclyde

Date of award

2016

Thesis identifier

T14428

Person Identifier (Local)

201386993

Person Identifier (ORCID)

https://orcid.org/0000-0003-3574-9436

Qualification Level

Doctoral (Postgraduate)

Qualification Name

Doctor of Philosophy (PhD)

Department, School or Faculty

Department of Naval Architecture, Ocean and Marine Engineering

Abstract

This thesis describes an experimental and numerical investigation of the dynamic performance of a TLP wind turbine concept in realistic environmental conditions. An extensive test campaign may be costly and time-consuming; nevertheless experiments are widely used for investigating the performance of marine systems and providing a great care is taken can yield reliable results. On the other hand, computational simulations offer a fast, low cost alternative to experiments. Continued technological advances offer ever-increasing computational power, which can be harnessed for fully coupled time-domain aero-hydro-servo-elastic simulations to integrate all complex environmental conditions in the same computational environment. Fully coupled analysis methods are rapidly gaining popularity for renewable energy applications. The application of such techniques to determine the performance of FOWTs allow designers to assess hydrodynamic performance at the early design stage enabling any necessary corrective action to be taken before the FOWT is deployed.The thesis shows that the use of experimental data is an invaluable tool in order to characterise the hydrodynamic performance of FOWTs and can also be used to improve and validate numerical predictions. This research demonstrates that even the most advanced numerical tools can sometimes produce questionable results. In this study it was demonstrated that in some cases the numerical predictions were very close to the results obtained from the experiments but in others the numerical model failed to accurately predict the platform behaviour. Some aspects of the experimental study were also problematic, in particular the amount of time required to set up such a complex experiment and also the problems associated with obtaining the correct mass properties whilst insuring adequate model stiffness in the roll and pitch modes of motion. The Software in the Loop system used to simulate the wind loading has not been validated.The results from both studies show the benefits of such TLP structures in terms of reduced motions which are vital to obtain a high power output from a wind turbine.

Advisor / supervisor

Khorasanchi, Mahdi
Incecik, A.

Resource Type

Doctoral thesis

DOI

10.48730/8d07-fe12

Funder

Embargo Note

The electronic version of this thesis is currently under moratorium due to copyright restrictions. If you are the author of this thesis, please contact the Library to resolve this issue.

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