Koç, Melodi Neşe
Renewable energy is becoming a popular research topic over the last decades. The floating wind turbine system consists of a typical wind turbine with a platform that the tower of the turbine is implemented. One of the popular floating systems is known as Tension Leg Platforms (TLPs). In this study, TLP is chosen due to the limiting nature of the system in terms of heave, roll and pitch motions. Due to the complexity of the system, coupling analysis of TLPs become important. In this thesis, a benchmark study in which a hydrodynamic analysis was carried out with SIMO, RIFLEX and WAMIT was taken as reference, and similar hydrodynamic analysis were carried out with ANSYS AQWA and HAMS. Fatigue, Aerodynamics, Structures and Turbulence (FAST) is one of the widely used open source code in order to carry out hydro, aero, servo, elastic coupling analysis of offshore wind turbine systems. FAST is used to analyze the TLP system, in this thesis. Three TLP designs are modeled and numerical calculations are performed under realistic environmental conditions in this thesis. Two of the six degree of motions, tendon tensions and natural periods are presented. The results of the three designs are compared with each other. Results of benchmark study and this thesis are compared and elucidate apparent similarity.


A comparison of renewable energy systems (onshore wind, offshore wind, conventional pv) for Bozcaada Island
Şentürk, Ayşe Eylül; Oğuz, Elif; Department of Civil Engineering (2020)
Renewable energy sources have been considered as a sustainable solution for energy production without polluting the environment. Shifting from fossil fuel to renewable sources has been suggested by many scientists to decrease the global warming effects. As several renewable energy sources exist such as solar, wind, hydro-power, etc., it is important to determine the appropriate option for a selected region in terms of maximizing efficiency and power output as well as minimizing life cycle costs (LCC). There...
A review of the optimization studies for Savonius turbine considering hydrokinetic applications
Maldar, Nauman Riyaz; Ng, Cheng Yee; Oğuz, Elif (Elsevier BV, 2020-12-15)
© 2020 Elsevier LtdThe trend of utilizing renewable energy sources is witnessing a brisk growth around the world. Among the various sources of renewable energy, hydropower is considered the most favorable due to its high potential and distinct advantages such as predictability, high energy density etc. Moreover, to extract the hydrokinetic energy from flowing streams, different designs of hydrokinetic turbines have emerged which operate on a similar principle as the wind turbines. The Savonius turbine is a ...
Stochastic modelling of wind energy generation
Alişar, İbrahim; Sevaioğlu, Osman; Department of Electrical and Electronics Engineering (2012)
In this thesis work, electricty generation modeling of the wind energy -one type of the renewable energy sources- is studied. The wind energy characteristics and the distribution of wind speed in a specific region is also examined. In addition, the power curves of the wind turbines are introduced and the relationship between the wind speed and wind power is explained. The generation characteristics of the wind turbines from various types of producers are also investigated. In this study, the main wind power...
TASDEMIROGLU, E; ARINC, F (Elsevier BV, 1988-01-01)
The necessity for technical-economic analysis of solar energy systems is obvious when assessing their feasibility vis-á-vis conventional alternative systems. Optimum magnitudes of the installation parameters should be defined under the required economic conditions. In this study, the optimization procedure was chosen so as to maximize the total accumulated saving throughout the economic lifetime of the system. The annual solar heating fraction of the system is assessed using the f-chart method which can be ...
How to Account for Uncertainty in Soil Properties in Offshore Monopile Design by Means of Probabilistic Analysis
Orakcı, Olgu; Huvaj Sarıhan, Nejan; Anogiatis, Georgios; Department of Civil Engineering (2022-2-28)
Offshore wind turbines gain more importance worldwide as they contribute to reduce greenhouse gas emissions and achieve a low-carbon future producing sustainable energy. Monopile is the most commonly employed foundation type for offshore wind turbines. Monopile design requires a comprehensive assessment of seabed soil properties with depth. However, seabed soils involve inherent variability and uncertainty in material properties. Modifications to deterministic design approaches are suggested in the literatu...
Citation Formats
M. N. Koç, “A NUMERICAL INVESTIGATION OF A TLP SYSTEM,” M.S. - Master of Science, Middle East Technical University, 2022.