Andrea Sciacchitano
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View article: Dynamic stall of a pitching airfoil under reverse flow conditions
Dynamic stall of a pitching airfoil under reverse flow conditions Open
This study experimentally investigates the dynamic stall of a pitching NACA 643418 airfoil under reverse flow conditions, whereby the geometric trailing edge is located upstream of the geometric leading edge. The investigation focuses on t…
View article: On the wake re-energization of the X-Rotor vertical-axis wind turbine via the vortex-generator strategy
On the wake re-energization of the X-Rotor vertical-axis wind turbine via the vortex-generator strategy Open
Wake losses are a significant source of inefficiency in wind farm arrays, hindering the development of high-energy-density wind farms offshore. Studies have demonstrated the potential of vertical-axis wind turbines (VAWTs) to achieve high-…
View article: Experimental Study of Regenerative Wind Farms Featuring Enhanced Vertical Energy Entrainment
Experimental Study of Regenerative Wind Farms Featuring Enhanced Vertical Energy Entrainment Open
This study presents the experimental validation of regenerative wind farms (RGWFs), a novel wind farm concept designed to enhance overall wind farm performance. RGWFs employ Multi-Rotor Systems with Lifting devices (MRSLs), an innovative w…
View article: Experimental demonstration of regenerative wind farming using a high-density layout of vertical-axis wind turbines
Experimental demonstration of regenerative wind farming using a high-density layout of vertical-axis wind turbines Open
The present study extends the idea of the vertical-axis wind turbine (VAWT) “vortex generator mode” for wake recovery on a wind farm scale, working towards the concept of “regenerative wind farming”, where upstream turbines entrain vertica…
View article: On-road vehicle aerodynamics with a large-scale stereoscopic-PIV setup: “the Ring of Fire”
On-road vehicle aerodynamics with a large-scale stereoscopic-PIV setup: “the Ring of Fire” Open
This paper presents the first full-scale particle image velocimetry (PIV) measurements to analyze the flow field of a car under real driving conditions. The Ring of Fire (RoF) measurement concept, introduced by Terra et al. (Exp Fluids 58:…
View article: Full-domain POD modes from PIV asynchronous patches
Full-domain POD modes from PIV asynchronous patches Open
A method is proposed to obtain full-domain spatial modes based on proper orthogonal decomposition (POD) of particle image velocimetry (PIV) measurements taken at different (overlapping) spatial locations. This situation occurs when large d…
View article: Wake Aerodynamic of Multi-Rotor System with Lifting-Devices Under Different Ambient Turbulence
Wake Aerodynamic of Multi-Rotor System with Lifting-Devices Under Different Ambient Turbulence Open
The aerodynamics of the multi-rotor system with lifting-devices (MRSL), an innovative concept of wind energy harvesting machine, is preliminary investigated using Large Eddy Simulation (LES) with actuator techniques. In the current setup, …
View article: A blind test on wind turbine wake modelling: Benchmark results and Phase II announcement
A blind test on wind turbine wake modelling: Benchmark results and Phase II announcement Open
Accurate modelling of wind turbine wakes is critical for optimizing wind farm performance, but the complexity of wake interactions poses significant challenges. This study presents a two-phase blind test campaign, part of the Horizon Europ…
View article: On the unsteady aerodynamics of a surging airfoil at $$90{^\circ }$$ incidence
On the unsteady aerodynamics of a surging airfoil at $$90{^\circ }$$ incidence Open
Wind turbine blades in standstill or parked conditions often experience large angles of attack (AoA), where vortex-induced vibrations (VIV) may occur that increase the risk of structural damage. To better understand the VIV of airfoils at …
View article: Numerical investigation of regenerative wind farms featuring enhanced vertical energy entrainment
Numerical investigation of regenerative wind farms featuring enhanced vertical energy entrainment Open
Numerical simulations of wind farms consisting of innovative wind energy harvesting systems are conducted. The novel wind harvesting system is designed to generate strong lift (vertical force) with lifting devices. It is demonstrated that …
View article: Asymmetric time sequence for multiple-exposure 3D PTV
Asymmetric time sequence for multiple-exposure 3D PTV Open
Recording onto a single-frame multiple exposures of the tracer particles has the potential to simplify the hardware needed for 3D PTV measurements, especially when dealing with high-speed flows. The analysis of such recordings, however, is…
View article: An Experimental Study of the Unsteady Aerodynamics of a Static DU91‐W2‐150 Airfoil at Large Angles of Attack
An Experimental Study of the Unsteady Aerodynamics of a Static DU91‐W2‐150 Airfoil at Large Angles of Attack Open
The airfoil DU91‐W2‐150 was investigated in the Low Speed Low Turbulence Tunnel at the Delft University of Technology to study unsteady aerodynamics. This experimental study tested the airfoil under a wide range of angles of attack (AoA) f…
View article: On the wake re-energization of the X-Rotor vertical-axis wind turbine via the vortex-generator strategy
On the wake re-energization of the X-Rotor vertical-axis wind turbine via the vortex-generator strategy Open
Wake losses are a significant source of inefficiencies in wind farm arrays, hindering the development of high-energy density wind farms offshore. Studies have demonstrated the potential of vertical-axis wind turbines (VAWTs) to achieve hig…
View article: Full-domain POD modes from PIV asynchronous patches
Full-domain POD modes from PIV asynchronous patches Open
A method is proposed to obtain full-domain spatial modes based on Proper Orthogonal Decomposition (POD) of Particle Image Velocimetry (PIV) measurements performed at different (overlapping) spatial locations. This situation occurs when lar…
View article: Experimental demonstration of regenerative wind farming using a high-density layout of VAWTs
Experimental demonstration of regenerative wind farming using a high-density layout of VAWTs Open
The present study extends the idea of the VAWT "vortex generator mode" for wake recovery on a wind farm scale, working towards the concept of "regenerative wind farming", where upstream turbines entrain vertical momentum for those downstre…
View article: Numerical Investigation of Regenerative Wind Farms Featuring Enhanced Vertical Energy Entrainment
Numerical Investigation of Regenerative Wind Farms Featuring Enhanced Vertical Energy Entrainment Open
Numerical simulations of wind farms consisting of innovative wind energy harvesting systems are conducted. The novel wind harvesting system is designed to generate strong lift (vertical force) with lifting-devices. It is demonstrated that …
View article: On the accuracy of data assimilation algorithms for dense flow fields reconstructions
On the accuracy of data assimilation algorithms for dense flow fields reconstructions Open
Within the framework of the European Union’s Horizon 2020 project HOMER (Holistic Optical Metrology for Aero-Elastic Research), data assimilation (DA) algorithms for dense flow fields reconstructions are comparatively assessed. The assessm…
View article: Object registration techniques for 3D particle tracking
Object registration techniques for 3D particle tracking Open
Image based three-dimensional (3D) particle tracking is currently the most widely used technique for volumetric velocity measurements. Inspecting the flow-field around an object is however, hampered by the latter, obstructing the view acro…
View article: Surface pressure reconstruction from LPT data with boundary conforming grids
Surface pressure reconstruction from LPT data with boundary conforming grids Open
The coupling between fluid-structure interactions is governed by the pressure distribution over the interaction surface between the fluid and solid domains. The capabilities of non-intrusive optical techniques, such as particle image veloc…
View article: A Study of the Near Wake Deformation of the X‐Rotor Vertical‐Axis Wind Turbine With Pitched Blades
A Study of the Near Wake Deformation of the X‐Rotor Vertical‐Axis Wind Turbine With Pitched Blades Open
Recent studies have revealed the large potential of vertical‐axis wind turbines (VAWTs) for high‐energy‐density wind farms due to their favorable wake recovery characteristics. The present study provides an experimental demonstration and p…
View article: A multi-directional redundant 3D-LPT system for ship–flight–deck wind interactions
A multi-directional redundant 3D-LPT system for ship–flight–deck wind interactions Open
In the past years, volumetric velocimetry measurements with helium-filled soap bubbles as tracer particles have been introduced in wind tunnel experiments and performed at large-scale, enabling the study of complex body aerodynamics. A lim…
View article: On-Site Characterization of Automotive Diffuser Aerodynamics by 3D LPT
On-Site Characterization of Automotive Diffuser Aerodynamics by 3D LPT Open
This investigation proposes a novel LPT facility featuring Helium-Filled Soap Bubbles flow tracers, LED illumination and two high-speed cameras to characterize the dominating flow patterns within automotive underbodies. A remote control (R…
View article: Global POD Modes From PIV Asynchronous Patches
Global POD Modes From PIV Asynchronous Patches Open
A method is proposed to obtain full-domain spatial modes based on Proper Orthogonal Decomposition (POD) of Particle Image Velocimetry (PIV) measurements performed at different (overlapping) spatial locations. When performing robotic volume…
View article: Object Registration Techniques For 3D Particle Tracking
Object Registration Techniques For 3D Particle Tracking Open
Image based 3D particle tracking is currently the most widely used technique for volumetric velocity measurements. Inspecting the flow-field around an object is however, hampered by the latter, obstructing the view across it. In this study…
View article: Iterative modal reconstruction for sparse particle tracking data
Iterative modal reconstruction for sparse particle tracking data Open
A method to reconstruct the dense velocity field from relatively sparse particle tracks is introduced. The approach leverages the properties of proper orthogonal decomposition (POD), and it iteratively reconstructs the detailed spatial mod…
View article: On-Road Vehicle Aerodynamics with the Ring-of-Fire Concept
On-Road Vehicle Aerodynamics with the Ring-of-Fire Concept Open
This paper presents the first full-scale particle image velocimetry(PIV) measurements to analyze the complete flow field of acar under real driving conditions. The Ring of Fire (RoF) measurementconcept, introduced by Terra et al. (Exp Flui…
View article: Experimental study of the impact of blade-tip mounted rotors on the X-Rotor vertical-axis wind turbine
Experimental study of the impact of blade-tip mounted rotors on the X-Rotor vertical-axis wind turbine Open
The Horizon 2020 European Commission-funded project - X-ROTOR - proposes a radical rethink of the traditional vertical-axis wind turbine geometry. The X-Rotor vertical axis wind turbine relies on blade-tip mounted rotors, referred to as se…
View article: Enhancing Wind Farm Efficiency Through Active Control of the Atmospheric Boundary Layer’s Vertical Entrainment of Momentum
Enhancing Wind Farm Efficiency Through Active Control of the Atmospheric Boundary Layer’s Vertical Entrainment of Momentum Open
In contemporary wind farm design, the primary focus has traditionally been on reducing wake interference to optimize energy capture from horizontal wind flows. However, with the scaling up of wind farms, their interaction with the Atmosphe…