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.


Aerodynamic and Hydrodynamic Investigations on Upscaling Effects and Optimization of Offshore Wind Turbines
Putra, Muhammad Juanda; Oğuz, Elif; Sezer Uzol, Nilay; Department of Civil Engineering (2022-9-2)
Scarcity and emission issues of conventional fossil fuels have caused a fast shift to renewable energy over the last decades. Wind energy, as one of the cheapest and most advanced forms of renewable energy, is expected to lead the energy market. A recent trend is to develop bigger wind turbines since upscaled wind turbines' rotor size increases power production and reduces a significant amount of operational and maintenance costs of wind turbines. However, there are strict limitations to the design of onsho...
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...
Development of a high-order navier-stokes solver for aeroacoustic predictions of wind turbine blade sections
Yalçın, Özgür; Özyörük, Yusuf; Department of Aerospace Engineering (2015)
Increased interest in renewable energy in the world has lead to research on wind turbines at a great pace. However, these turbines have come with a noise problem. The noise source of wind turbines is primarily aerodynamic noise highly related to complex, three dimensional, unsteady flow fields around them. Therefore, determination of these sources requires successful, accurate, turbulent flow solutions. In addition, because acoustic waves are non-dispersive and non-dissipative, such solutions must be carrie...
Citation Formats
M. N. Koç, “A NUMERICAL INVESTIGATION OF A TLP SYSTEM,” M.S. - Master of Science, Middle East Technical University, 2022.