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Abstract
An analysis of the generation of vortices and their effects by vane-type vortex generators (VGs) positioned on a three-dimensional flat plate with a backward-facing ramp and adverse gradient pressure is carried out. The effects of a conventional vortex generator and a sub-boundary layer vortex generator are implemented by using a source term in the corresponding Navier-Stokes equations of momentum and energy according to the so-called jBAY Source Term Model. The influence of the vortex generator onto the computational domain flow is modelled through this source term in the Computational Fluid Dynamics (CFD) simulations using the open-source code OpenFOAM. The Source Term Model seems to simulate relatively well the streamwise pressure coefficient distributions all along the flat plate floor as well as certain parameters studied for vortex characterization such as vortex path, decay and size for the two vane-type vortex generators of different heights studied. Consequently, the implementation of the Source Term Model represents an advantage over a fully Mesh-Resolved Vortex Generator Model for certain applications as a result of a meaningful decrease in the cell number of the computational domain which implies saving computational time and resources.
Highlights
The need for bigger capacities and installed power of wind generation systems has allowed the implementation of larger rotor wind turbines
The results show a larger increment between the jBAY and baseline distributions for the H1 = 0.8δ vane-type vortex generators (VGs) case than for the H2 = 0.2δ vane-type VG case
The generation of vortices and their effects by a conventional vortex generator and a sub-boundary layer vortex generator positioned on a three-dimensional flat plate with a backward-facing ramp and adverse gradient pressure has been carried out by means of Computational Fluid Dynamics (CFD) simulations using the open-source code OpenFOAM. The influence of these two vane-type vortex generators (VGs) on the computational domain flow is implemented by using a source term in the corresponding Navier-Stokes equations according to the so-called jBAY Source Term Model
Summary
The need for bigger capacities and installed power of wind generation systems has allowed the implementation of larger rotor wind turbines. Wind power generators of 5–7 MWatt may present rotor blades of 60 m long or even larger. This meaningful increase in the rotor size and weight of wind turbines has made that the techniques used in the past years to control them have to be improved. Johnson et al [1] summarized a big part of the most relevant flow control techniques applied in wind turbines to work in an optimal and safe way under diverse atmospheric conditions. Researchers have been trying to optimize and install these devices in multi-megawatt wind turbines. Wood [5] and Johnson et al [1] developed a four layer scheme to conceptually classify these flow control devices
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