Floating offshore wind turbines (FOWTs) are subjected to platform motion induced by and wave loads. The oscillatory movement trigger vortex instabilities, modifying the wake structure, influencing flow reaching downstream turbines. In this work, of a FOWT is analysed means numerical simulations comparison with linear stability theory. Two simplified models based on vortices developed for all degrees freedom turbine motion. our simulations, blades modeled as actuator lines spectral-element...

The actuator line method (ALM) is used extensively in wind turbine and rotor simulations. However, its original uncorrected formulation overestimates the forces near tip of blades does not reproduce well on translating wings. recently proposed vortex-based smearing correction for ALM a based physical mathematical properties simulation that allows more accurate general ALM. So far, to correct blades, depended an iterative process at every time step, which usually slower, less stable...

We develop a linear theory for unsteady aerodynamic effects of the actuator line method (ALM). This is validated using ALM simulations, where we compute lift generated by harmonic transverse oscillation thin airfoil in uniform flow, comparing results with Theodorsen's theory. comparison elucidates underlying characteristics and limitations when applied to aerodynamics. Numerical simulations were conducted across range chord lengths frequencies. Comparison theoretical predictions shows...

Two configurations typical of fixed-wing aircraft are simulated with the actuator line method (ALM): a wing winglets and T-tail. The ALM is extensively used in rotor simulations to model blades by body forces, which calculated from airfoil data relative flow velocity. This has not been simulate airplane aerodynamics, despite its advantage allowing coarser grids. may be credited failure uncorrected accurately predict forces near tip wings, even for simple configurations. recently-proposed...

Abstract The hydrodynamic stability of a vortex system behind two in-line wind turbines operating at low tip-speed ratios is investigated using the actuator-line method in conjunction with spectral-element flow solver Nek5000. To this end, simplified setup identical turbine geometries rotating same ratio simulated and compared single wake. Using frame reference, steady solution obtained, which serves as base state to study growth mechanisms induced perturbations system. It shown that,...

Abstract Floating offshore wind turbines (FOWTs) are the next frontier in energy, allowing exploration of deep-water regions previously unavailable to fixed-foundation turbines. Since operate lower turbulence levels, intrinsic hydrodynamic unstable modes tip vortices can have even more relevance than onshore For floating turbines, platform motion induced by and wave loads trigger vortex instabilities, modifying wake structure, possibly influencing flow reaching downstream In present paper,...

Parabolized Stability Equations (PSE) have been shown to model wavepackets and, consequently, the near field of turbulent jets with reasonable accuracy.Because these capabilities, PSE is a promising reduced-order derive control laws that could be employed reduce sound generation jet.The purpose this work apply obtain time-domain transfer functions estimate both fluid-dynamic and acoustic fields supersonic results were compared obtained from database well-validated large-eddy simulation...

Parabolized stability equations (PSE) have been shown to model wavepackets and, consequently, the near-field of turbulent jets with reasonable accuracy. In this work, PSE were employed obtain a reduced-order that could estimate both fluid-dynamic and acoustic fields supersonic jet in computationally efficient approximation for resolvent-based estimation based on single input. From unsteady pressure data at an input position, time-domain field was estimated using transfer functions obtained...

The use of the complex velocity potential and is widely disseminated in study two-dimensional incompressible flows. advantages working with analytical functions made this representation flow ubiquitous field theoretical aerodynamics. However, not usually employed linear stability studies, where as real vectors preferred by most authors, order to allow perturbation exponential function. Some classical attempts studies suffer from formal errors. In work, we present a framework that reconciles...

The actuator line method (ALM) is extensively used in wind turbine and rotor simulations. However, its original uncorrected formulation overestimates the forces near tip of blades does not reproduce well on translating wings. recently proposed vortex-based smearing correction for ALM a based physical mathematical properties simulation that allows more accurate general ALM. So far, to correct blades, depended an iterative process at every time step, which usually slower, less stable...

Two configurations typical of fixed-wing aircraft are simulated with the actuator line method (ALM): a wing winglets and T-tail. The ALM is extensively used in rotor simulations to model blades by body forces, which calculated from airfoil data relative flow velocity. This has not been simulate airplane aerodynamics, despite its advantage allowing coarser grids. may be credited failure uncorrected accurately predict forces near tip wings, even for simple configurations. recently-proposed...