Floating offshore wind turbines (FOWT) have attracted more and attention in recent years. However, environmental loads on FOWTs higher complexity than those the traditional onshore or fixed-bottom turbines. In addition to aerodynamic turbine blades, hydrodynamic also act support platform. A review analysis of simulation supporting platform, coupled aero- hydro-dynamic study FOWTs, is presented ...

Abstract A new frequency-domain dynamics model has been developed that uses open-source components to efficiently represent a complete floating wind turbine system. The model, called RAFT (Response Amplitudes of Floating Turbines), incorporates quasi-static mooring reactions, strip-theory and potential-flow hydrodynamics, blade-element-momentum aerodynamics, linear control. formulation is compa...

The wake flow past an axisymmetric body of revolution at a diameter-based Reynolds number $Re=u_{\infty }D/\nu =5000$ is investigated via direct numerical simulation. study focused on identification coherent vortical motions and the dominant frequencies in this flow. Three are identified wake: vortex shedding motion with frequency $St=fD/u_{\infty }=0.27$ , bubble pumping $St=0.02$ very-low-fre...

The expected flow asymmetry behind a three-dimensional notchback Ahmed body is numerically investigated using large-eddy simulations with different blockage ratios of 0%, 5%, 10%, and 20%. focus the study on natural bi-stable influenced by ratio. Although wake can be observed under ratio within 0%−10%, significant influence sensitive bi-stability indicated structures, pressure gradients, dynami...

This paper extends the reduced basis method for the solution of parametrized optimal control problemspresented in [1] to the case of noncoercive (elliptic) equations, such as the Stokes equations. We discussboth the theoretical properties – with particular emphasis on the stability of the resulting double nestedsaddle-point problems and on aggregated error estimates – and the co...

In this paper an energy harvesting system based on a piezoelectric converter to extract energy from airflow and use it to power battery-less sensors is presented. The converter is embedded as a part of a flexure beam that is put into vibrations by von Karman vortices detached from a bluff body placed upstream. The vortex street has been investigated by Computational Fluid Dynamics (CFD) simulat...