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Ye, Q. (author), Schrijer, F.F.J. (author), Scarano, F. (author)The transitional flow features past a micro-ramp are investigated in the incompressible flow regime at critical and supercritical roughness-height based Reynolds number (Reh). Tomographic PIV is adopted as the diagnostic technique to identify the instantaneous three-dimensional flow behaviour in the domain of 73 ramp height streamwise. The...conference paper 2016
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Gentile, V. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author), Scarano, F. (author)The backflow instability in the wake past a cylindrical blunt-based body in pitch is investigated at a Reynolds number ReD = 6.7 · 104 based on the cylinder diameter. Time-resolved stereoscopic particle image velocimetry measurements have been performed in a cross-flow plane located 0.3 D downstream of the model base. An increasing displacement...conference paper 2016
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Gentile, V. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author), Scarano, F. (author)The so-called very-low-frequency (VLF) azimuthal meandering of the reversed-flow region has been shown to contribute significantly to the unsteadiness of the turbulent wake flow past a bluff body of revolution (Rigas et al. 2014; Grandemange et al. 2014). Such an erratic behavior causes a continuous change in the wake topology and, particularly...conference paper 2016
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Terra, W. (author), Sciacchitano, A. (author), Scarano, F. (author)Experiments are conducted to determine the drag of a full-scale cyclist model in a wind tunnel at 4 m/s. The aerodynamic drag is evaluated from tomo-PIV measurements in the wake of the model applying the conservation of momentum within a control volume. The measurements are conducted in a thin volume of 100 x 170 x 3 cubic centimeters using...conference paper 2016
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Schneiders, J.F.G. (author), Singh, P. (author), Scarano, F. (author)The manuscripts presents the working principle of a novel technique to interpolate sparse and scattered particle tracking velocimetry (PTV) measurements onto a dense grid, by using the velocity measurements along a full particle trajectory. The method performs iteratively a vortex-in-cell simulation (Schneiders et al. 2014 in Exp Fluids 55:1692)...conference paper 2016
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- Schneiders, J.F.G. (author), Scarano, F. (author), Elsinga, G.E. (author) conference paper 2016
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Avallone, F. (author), Ragni, D. (author), Schrijer, F.F.J. (author), Scarano, F. (author), Cardone, G. (author)In this study, the mean flow organization in the symmetry plane of the recirculation region ahead of a cylindrical roughness element immersed in an incoming laminar boundary layer at Mach number equal to 6.5 is investigated. The flow topology is inspected with planar particle image velocimetry (PIV), InfraRed (IR) Thermography and Schlieren flow...conference paper 2015
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Schneiders, J.F.G. (author), Azijli, I. (author), Scarano, F. (author), Dwight, R.P. (author)A method is proposed to reconstruct instantaneous velocity from time-resolved tomographic PTV, employing both instantaneous velocity and velocity material derivative. This improves upon current techniques by not only including penalization of velocity divergence, but also requiring consistency with the temporal derivative of the PTV particle...conference paper 2015
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Sciacchitano, A. (author), Caridi, G. (author), Scarano, F. (author)Aerodynamics plays a crucial role in many speed sports, where races are often won by fractions of a second. A thorough understanding of the flow field around an athlete is of paramount importance to optimize the athletes’ posture, garment roughness and equipment shape to achieve the minimum aerodynamic drag and maximum velocity. To date,...conference paper 2015
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Terra, W. (author), Sciacchitano, A. (author), Scarano, F. (author)Large-scale tomographic Particle Image Velocimetry is proposed as a tool for the on-site aerodynamic investigation in speed sports. The ring-of-fire concept is presented, which relies upon a tomographic PIV system used during the training of athletes in speed sports. The system consists of a short tunnel installed in a velodrome, through which...conference paper 2015
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- Schneiders, J.F.G. (author), Caridi, G. (author), Sciacchitano, A. (author), Scarano, F. (author) conference paper 2015
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- Gentile, V. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author), Scarano, F. (author) conference paper 2015
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Ye, Q. (author), Schrijer, F.J. (author), Scarano, F. (author)The fluid dynamics process leading to laminar-turbulent transition behind an isolated roughness element is investigated in the incompressible regime using particle image velocimetry. The study covers the effect of roughness size and geometry on the promotion of transition. The measurement domain covers a large streamwise range from the near wake...conference paper 2015
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The fluid dynamics process leading to laminar-turbulent transition behind an isolated roughness element is investigated in the incompressible regime using particle image velocimetry. The study covers the effect of roughness size and geometry on the promotion of transition. The measurement domain covers a large streamwise range from the near wake...conference paper 2015
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Gentile, V. (author), Schrijer, F.F.J. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)Stereoscopic Particle Image Velocimetry (PIV) was used to study the wake of an ogive-cylinder with after-body at a diameter-based Reynolds number ReD = 6.7 · 104. The vertical fluctuations reduced from a maximum of 0.18 U? in absence of rear-protrusion, up to 0.12 U? and 0.1 U? when the main-body to after- body diameter ratio d/D was increased...conference paper 2015
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Ye, Q. (author), Schrijer, F.F.J. (author), Scarano, F. (author)Transitional flow over isolated roughness elements is investigated in the incompressible flow regime using Tomographic PIV. Three different geometries are considered (micro-ramp, cylinder and square) with same height and span. Their effect on accelerating boundary layer transition is compared and discussed. The measurement domain encompasses the...conference paper 2015
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- Caridi, Giuseppe Carlo Alp (author), Ragni, D. (author), Sciacchitano, A. (author), Scarano, F. (author) conference paper 2015
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Sun, Z. (author), Van Oudheusden, B.W. (author), Schrijer, F.F.J. (author), Scarano, F. (author)The wake resulting from two micro ramps operating in a supersonic boundary layer at Ma = 2:0 is investigated by means of PIV. Two micro ramps are investigated with height of 60% and 80% of the undisturbed boundary layer with thickness of 5.2 mm. The measurement domain encompasses the range from 10 to 32 ramp heights downstream of the device. The...conference paper 2013
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Lynch, K. (author), Scarano, F. (author)A tomographic PIV system is introduced for the instantaneous measurement of the material derivative of velocity (VMD). The system is able to operate with very short temporal separation and is therefore suitable for applications in high-speed flows. The method of operation consists of the imaging of a measurement volume using an array of 12 CCD...conference paper 2013
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Lynch, K. (author), Scarano, F. (author)A tomographic PIV system is introduced for the instantaneous measurement of the material derivative of velocity (VMD). The system is able to operate with very short temporal separation and is therefore suitable for applications in high-speed flows. The method of operation consists of the imaging of a measurement volume using an array of 12 CCD...conference paper 2013