Simulation of offshore wind turbines by computational multi-physics [Elektronische Ressource] / von Tarin Srisupattarawanit

Simulation of Offshore Wind Turbines byComputational Multi-PhysicsVon derFakult¨at Architektur, Bauingenieurwesen und Umweltwissenschaftender Technischen Universitat¨ Carolo-Wilhelminazu Braunschweigzur Erlangung des Grades einesDoktor-Ingenieurs (Dr.-Ing.)genehmigteDissertationvonTarin Srisupattarawanitaus Bangkok, ThailandEingereicht am 21 September 2006Mundlic¨ he Prufung¨ am 2 February 2007Berichterstatter Prof. Hermann G. Matthies, PhD.Prof. Dr.Ing. Sabine Langer2007ˆˆˆˆAbstractPresentlytherearequiteafewprojectsinvariousstagesofplanningandconstructionwhichaimatplacingwindturbinesoffshoreforelectricitygeneration. Theretheusuallyhigherwindspeedscan 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 involveMonte Carlo Simulations of their operation in turbulent wind. In the offshore environment, wehave to consider a coupled system, consisting of the structure, foundation, surrounding soil, theaerodynamic 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 coupledhere to give the whole system. They consist of:The structural subsystem, which is a nonlinear large displacement finite element model(FEM).