Helicoidal vortex model for steady and unsteady flows

Flow physics and Stokes’ theorem in wind turbine aerodynamics

“…Navier-Stokes analysis is mandatory in the vicinity of the blade in order to capture complex 3-D flow phenomena. The PCS method uses a commercial N-S code, CFX 5.7, for the analysis of the near-field and the VLM code [8] for the far-field. The spanwise bound circulation C is the main component of the coupling methodology.…”

“…Results are compared with measured data obtained in the NASA Ames wind tunnel [7] and the VLM code [8] as a stand-alone method. The normal force coefficient C N at r/R = 0.47 is shown in Fig.…”

“…A quantitative comparison is performed against measured wind tunnel data [7] and a vortex line method (VLM) [8].…”

Helicoidal vortex model for wind turbine aeroelastic simulation

“…This is also the preferred approach for design of the rotor blade, although verification with more challenging situations is required, [1,2]. In a previous paper, [3], the helicoidal vortex model has been extended to account for unsteady effects associated with yaw. In this paper, further extensions to account for the blade flexibility and tower interference have been implemented.…”

Wind turbine aerodynamics and loads control in wind shear flow

“…Lifting line, lifting surface and panel methods have been widely used in the research of wind turbines. A helicoidal vortex model was extended to account for unsteady effects associated with yaw by Chattot [16]. A lifting surface method with free wake model was used to predict the performance and airloads on a wind turbine under both unyawed and yawed flow condition by Gupta [17].…”