A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Simulation of Offshore Wind Turbines by Computational Multi-Physics
Presently there are quite a few projects in various stages of planning and construction which aim at placing wind turbines offshore for electricity generation. There the usually higher wind speeds can be exploited, but the turbines are also additionally subjected to the offshore environment, i.e. especially wave loading. Fatigue calculations of wind turbine structures usually involve Monte Carlo Simulations of their operation in turbulent wind. In the offshore environment, we have to consider a coupled system, consisting of the structure, foundation, surrounding soil, the aerodynamic system for the wind model and the hydrodynamic system for the wave model. In this work, the models have been developed initially separately and are consistently coupled here to give the whole system. They consist of: ˆ The structural subsystem, which is a nonlinear large displacement finite element model (FEM). ˆ The aerodynamic subsystem, with prescribed stochastic wind characteristics and an instationary dynamic stall model for the aeroelastic blade loading ˆ The hydrodynamic subsystem, modelled mainly as potential flow and coupled to the stochastic wave field to describe the real sea state and take the far–field into account. The computations on this part is based on the boundary element method (BEM), to make the computations faster in this part the fast multipole method is used. ˆ The soil dynamic subsystem, modelled as near-field soil near the underground structure and discretized by the FEM and the far-field effects is included by the scaled boundary finite element method (SBFEM). All of these models are coupled in time domain, and the consistent simulation of the offshore wind turbine can be performed based on the concept idea of partitioned method. The results of simulation show at least a very good performance of partitioned method, also show the reasonable results as we can find at the end of this dissertation.
Simulation of Offshore Wind Turbines by Computational Multi-Physics
Presently there are quite a few projects in various stages of planning and construction which aim at placing wind turbines offshore for electricity generation. There the usually higher wind speeds can be exploited, but the turbines are also additionally subjected to the offshore environment, i.e. especially wave loading. Fatigue calculations of wind turbine structures usually involve Monte Carlo Simulations of their operation in turbulent wind. In the offshore environment, we have to consider a coupled system, consisting of the structure, foundation, surrounding soil, the aerodynamic system for the wind model and the hydrodynamic system for the wave model. In this work, the models have been developed initially separately and are consistently coupled here to give the whole system. They consist of: ˆ The structural subsystem, which is a nonlinear large displacement finite element model (FEM). ˆ The aerodynamic subsystem, with prescribed stochastic wind characteristics and an instationary dynamic stall model for the aeroelastic blade loading ˆ The hydrodynamic subsystem, modelled mainly as potential flow and coupled to the stochastic wave field to describe the real sea state and take the far–field into account. The computations on this part is based on the boundary element method (BEM), to make the computations faster in this part the fast multipole method is used. ˆ The soil dynamic subsystem, modelled as near-field soil near the underground structure and discretized by the FEM and the far-field effects is included by the scaled boundary finite element method (SBFEM). All of these models are coupled in time domain, and the consistent simulation of the offshore wind turbine can be performed based on the concept idea of partitioned method. The results of simulation show at least a very good performance of partitioned method, also show the reasonable results as we can find at the end of this dissertation.
Simulation of Offshore Wind Turbines by Computational Multi-Physics
Simulation von Offshore Wind Tubinen durch computergestützte Multi-Physik
Srisupattarawanit, Tarin (author) / Universitätsbibliothek Braunschweig (host institution) / Matthies, Hermann (tutor)
2007
Miscellaneous
Electronic Resource
English
DDC:
624