Numerical Simulation Of Aerodynamic And Hydrodynamic Flow Fields Around Offshore Wind Turbine

As the energy crisis and environment crisis emerge, almost everycountries strive to search and develop the recycle, renewable and cleanenergy. Among all kinds of new energy, wind energy is the mostpromissing commercial prospect and the most mature technology. Inparticular, the development of offshore wind energy, because of its specialand strong advantages, has been one of the most important directions ofwind energy.This paper is prepared against the backgroup of offshore windtechnology, based on the advantages of naval architecture and oceanengineering, as well as the fundamental academic ideas is the interactionsof different subjects and separate before combine. All the computations arebased on the open source software OpenFOAM written withobject-oriented C++language and the naoe-FOAM-SJTU solver developedby our group. The aerodynamics, hydrodynamics and coupled mutualinteraction between aerodynamics and hydrodynamics of offshore windturbine are analysed systematically and deeply. The main contents can besummarised as follows:1. Numerical simulation of aerodynamics of National RenewableEnergy Laboratory (NREL) Phase5wind turbine is conducted using threedimensional Navier-stokes euqtion and k-ωSST turbulence model withMultiple Reference Frame(MRF) and Sliding Mesh method. We studiedthe impacts of different inlet velocity and different number of blades.Based on them, the interaction between tower and blades, atmosphericboundary layer impacts and the comparison between upwind wind turbine and downwind wind turbine are studied.2. The research object is the first Asian offshore windfarm—Shanghai Donghai Bridge Offshore Wind Farm foundation.Numerical simulation of hydrodynamics of grouped high piles andplatform based on the solver naoe-FOAM-SJTU. The force exerted bywave, the wave run-up, the green water of platform and the detailed fluidinformation under the regular wave and the solitary wave are studied.These results could provide some useful information for the design ofoffshore wind turbine foundation. In order to make the research frameworkmore complete, at last the hydrodynamics of floating offshore wind turbineis simulated numerically by naoe-FOAM-SJTU solver. The platform’sforce exerted by wave, motion response and the flow information arestudied.3. We develop the new solver OWT-FOAM-SJTU based on themature naoe-FOAM-SJTU. The new solver can deal with the situation ofwind, wave and current simultaneously, at the same time MutifulReference Frame(MRF) method is incorporated in the new solver. We cansimulate the interaction of hydrodynamics and aerodynamics of fixed-bottom offshore wind turbine.