Searched for: subject%3A%22Vortex%255C+generators%22
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Yu, W. (author), Bajarūnas, Lukas K. (author), Zanon, Alessandro (author), Ferreira, Carlos J.S. (author)
Vortex generators (VGs) have been widely applied to wind turbines thanks to their potential to increase aerodynamic performance. Due to the complex inflow perceived by a rotor and the proneness to flow separation, VGs on wind turbines usually experience highly unsteady flow. While there are models that exist to simulate the steady effects of...
journal article 2024
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Bajarūnas, Lukas (author)
master thesis 2022
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Sahu, Sidhartha (author)
Vortex generators (VGs) are typically about two orders of magnitude smaller than their host component (such as an airplane wing). For this reason, conducting a fully-resolved RANS simulation to isolate their impact on the flow field is computationally expensive. This work presents a goal-oriented adjoint-based approach to model vortex generators...
master thesis 2022
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van Uitert, Jeroen (author)
This research has been performed with the purpose of understanding the cause of the unstable pitch break experienced by the Flying V at a lift coefficient of CL = 0.95. Without understanding and possibly elimination of the pitch break, the flying V’s usable maximum lift coefficient is lower and the pitching moment behavior and gust response...
master thesis 2021
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De Tavernier, D. (author), Ferreira, Carlos (author), Viré, A.C. (author), LeBlanc, B.P. (author), Bernardy, S. (author)
Vortex generators (VGs) have proven their capabilities in wind turbine applications to delay stall in steady flow conditions. However, their behaviour in unsteady conditions is insufficiently understood. This paper presents an experimental study that demonstrates the effect of VGs in unsteady flow, including controlling and suppressing the...
journal article 2021
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Baldacchino, D. (author)
Vortex generators have become a ubiquitous sight on the modern wind turbine blade. These small, passive devices can increase the energy extraction potential of a rotor, but their subtle footprint disguises the technical difficulties associated with designing and integrating them onto wind turbine blades. The complexity of rotor inflow and the...
doctoral thesis 2019
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Dierickx, Jan (author)
A surrogate model for vortex generator flows has been created. This was done by developing a framework to generate a reduced order approximation of a discrete optimized source-term on a uniform grid. The discrete optimized source term uses the flow field of a vortex generator simulation with a body-fitted mesh (BFM) as objective. The reduced...
master thesis 2019
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Florentie, L. (author)
Vortex generators (VGs) are awidespread means of passive flowcontrol, capable of yielding significant performance improvements to lift-generating surfaces (e.g. wind-turbine blades and airplane wings), by delaying boundary-layer separation. These small vanetype structures, which are typically arranged in arrays, trigger the formation of small...
doctoral thesis 2018
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De Tavernier, D. (author), Baldacchino, D. (author), Ferreira, Carlos (author)
To assess and optimize vortex generators (VGs) for flow separation control, the effect of these devices should be modelled in a cost and time efficient way. Therefore, it is of interest to extend integral boundary layer models to analyse the effect of VGs on airfoil performance. In this work, the turbulent boundary layer formulation is...
journal article 2018
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Baldacchino, D. (author), Ferreira, Carlos (author), De Tavernier, D. (author), Timmer, W.A. (author), van Bussel, G.J.W. (author)
Passive vane-type vortex generators (VGs) are commonly used on wind turbine blades to mitigate the effects of flow separation. However, significant uncertainty surrounds VG design guidelines. Understanding the influence of VG parameters on airfoil performance requires a systematic approach targeting wind energy-specific airfoils. Thus, the 30...
journal article 2018
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Florentie, L. (author), Hulshoff, S.J. (author), van Zuijlen, A.H. (author)
An optimization approach is presented that can be used to find the optimal source term distribution in order to represent a high-fidelity vortex-generator (VG) induced flow field on a coarse mesh. The ap- proach employs the continuous adjoint of the problem, from which an exact sensitivity is calculated and used in combination with a trust...
journal article 2017
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Sanders, Carsten (author)
In this thesis a vortex generator is presented, that can generate controlled ring-vortex injections into a pipe flow. The performance of the generator and the coherence of its structures is tested by applying a dye visualisation method. Furthermore, iso-contour plots of the 3D velocity field, obtained from Stereoscopic Particle Image Velocimetry...
master thesis 2017
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Manjunath, Pranav (author)
Vortex Generators (VGs) are one of the most commonly used passive flow control devices. Recent studies have shown that it is beneficial to use sub-boundary layer vortex generators (SBVGs). The height of these generators varies between 10% - 50% of the boundary layer thickness. However, the reduced height causes the induced vortices to be...
master thesis 2017
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Wanthanadamkerng, Thawatchai (author)
The use of vortex generators (VGs) is a prevailing technology in large modern wind turbines due to its potential to increase wind turbine annual energy production [39] by re-energizing the momentum energy in the boundary layer and, as a consequence, delay the flow separation. Many researchers have been extensively studying the effects of VGs on...
master thesis 2017
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Ebrahimi, Amin (author), Naranjani, Benyamin (author), Milani, Shayan (author), Dadras Javan, Farzad (author)
Heat and fluid flow in a rectangular channel heat sink equipped with longitudinal vortex generators have been numerically investigated in the range of Reynolds numbers between 25 and 200. Aqueous solutions of carboxymethyl cellulose (CMC) with different concentrations (200–2000 ppm), which are shear-thinning non-Newtonian liquids, have been...
journal article 2017
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Stam, C.J. (author)
Vortex generators (VGs) are effectively used to improve the performance of the wind turbine blades by means of flow control. VGs can be represented by local geometrical disturbance on the aerodynamic surfaces. This disturbance generates vortices in the streamwise direction, energizing the boundary layer and hence delaying or suppressing the flow...
master thesis 2016
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Nedumaran, A.K. (author)
Vortex Generators (VGs) are flow control devices commonly applied in wind turbine blades, among other applications. A significant advance in the design of wind turbine blades would be the integration of vortex generators in the aerofoil optimisation process. Currently, aerofoil optimisation relies on either computational fluid dynamics or...
master thesis 2016
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Nayak Kallarbail, S. (author)
Oblique Shock-Wave Reflections or Shock Wave-Boundary Layer interactions (SWBLI) are complex phenomena which commonly occur in high speed flight. SWBLIs can have catastrophic consequences on the aircraft due to shock induced separation and unsteadiness of the interaction. These adverse effects can be mitigated by manipulating the boundary layer,...
master thesis 2016
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Ebrahimi, Amin (author), Naranjani, Benyamin (author)
In this study, a flat-plate channel configured with pyramidal protrusions are numerically analysed for the first time. Simulations of laminar single-phase fluid flow and heat transfer characteristics are developed using a finite-volume approach under steady-state condition. Pure water is selected as the coolant and its thermo-physical...
journal article 2016
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Van Egmond, J.J. (author)
A current focus in the quest for improvement in fuel efficiency in aircraft design is the simplification of complex high lift systems. A simpler high lift system in combination with flow separation control is potentially able to meet the current high lift performance requirements, while still reducing overall complexity. Passive flow separation...
master thesis 2015
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