Desarrollo de herramientas software para el estudio dinámico de aerogeneradores offshore sometido a cargas acopladas de viento y oleaje

Supervised by:
  1. Julio Garcia Espinosa Director
  2. Blas Zamora Parra Co-director

Defence university: Universidad Politécnica de Cartagena

Fecha de defensa: 09 July 2014

  1. Antonio Souto Iglesias Chair
  2. Antonio Sánchez Káiser Secretary
  3. Daniel Di Capua Committee member
  1. Ingeniería Térmica y Fluidos

Type: Thesis

Teseo: 373794 DIALNET


The change of direction towards sustainable energetic model requires a technology development to get a price reduction of electricity. In the last years, Wind Energy has demonstrated that it can be helpful to this change. Notwithstanding, there are clear limitations in the installation of onshore wind farms. These lead to explore new horizons, such as ocean. Offshore Wind Energy is raised like a solution of the limitations in Onshore Wind Energy. Present work contributes to the study Offshore Wind Technology by means of tools development, which can produce useful coupled analysis on offshore wind turbines. The studies in Offshore Wind Technology constitute a challenge from the scientific, technological, and engineering point of view. The field is wide, from aerodynamics to hydrodynamics, passing through mooring systems. Therefore, three tools are developed in this Thesis to tackle different parts of the offshore wind turbine system. First of all, tool for whole aeroelastic analysis of wind turbine is treated. FAST/AeroDyn, one of the most relevant codes for analysing wind turbines is used. The programming with XML and Tcl/Tk allow us to make Graphical User Interface (GUI) for integrating FAST/AeroDyn software. This code is applied to the study of a typical offshore wind turbine. Weight reduction is carried out through the GUI. So, better stability is achieved. Then, a code for evaluating the behaviour of floating wind turbines, and also floating structures made by slender elements, is presented. Tool is based on linearized Morison equations. XML and Tcl/Tk languages are employed for programming the GUI. Since FAST allows us to obtain the linearization of wind turbine for given wind conditions, a procedure to carry out coupled linear analysis can be established, thus obtaining the Response Amplitude Operator (RAO) curves of the wind turbine. Last application is developed for evaluating the dynamic behaviour of mooring system in offshore structures. The Finite Element Method (FEM) along with time integrator schemes like a Bossak¿Newmark method, are used to get dynamics and tension of mooring lines. This new code constitutes an advance of this field. Code is linked with a powerful hydrodynamic solver called SeaFEM using C++ programming, which permits us to obtain the dynamic behaviour of floating devices using FEM in time domain. Algorithms to couple the dynamics of mooring lines between floating devices are also developed. Some examples and code validations are exposed, at the end of this part. The culmination of the Thesis is obtained by means of integral analysis of an offshore wind turbine, based on a Spar buoy type. The integral analysis includes wind and hydrodynamics loads, along with currents loads, as well as the mooring coupling interactions.