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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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Pröbsting, S. (author), Serpieri, J. (author), Scarano, F. (author)Tonal noise generated by airfoils observed at low to moderate Reynolds numbers is related to laminar boundary layer instabilities, which has lead to the term laminar boundary layer instability noise. The particular features of the acoustic spectrum have been discussed and a number of theories have been proposed in literature over the past 50...conference paper 2013
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- Souverein, L.J. (author), van Oudheusden, B.W. (author), Scarano, F. (author) conference paper 2008
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- Ashok, A. (author), Ragni, D. (author), Van Oudheusden, B.W. (author), Scarano, F. (author) conference paper 2008
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- Ashok, A. (author), Ragni, D. (author), Van Oudheusden, B.W. (author), Scarano, F. (author) conference paper 2008
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- Haigermoser, C.A.H.K. (author), Scarano, F. (author), Onorato, M. (author) conference paper 2008
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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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Kähler, C.J. (author), Cierpka, C. (author), Scharnowski, S. (author), Manhart, M. (author), Sciacchitano, A. (author), Lynch, K. (author), Scarano, F. (author), Wieneke, B. (author), Willert, C. (author), Jeon, Y. J. (author), Chatellier, L. (author), Augereau, L. (author), Tremblais, B. (author), David, L. (author)Classical Particle Image Velocimetry (PIV) uses two representations of the particle image distribution to determine the displacement of the particle image pattern by spatial cross-correlation. The accuracy and the robustness are however limited by the fact that only two representations at t and t +?t are present. Thus, only a first order...conference paper 2013
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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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- Schrijer, F.F.J. (author), Mignoli, G. (author), Scarano, F. (author), Walpot, L.M.G.F.M. (author) conference paper 2008
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Percin, M. (author), Hu, Y. (author), Van Oudheusden, B.W. (author), Remes, B. (author), Scarano, F. (author)The work explores the use of time-resolved tomographic PIV measurements to study a flapping-wing model, the related vortex generation mechanisms and the effect of wing flexibility on the clap-and-fling movement in particular. An experimental setup is designed and realized in a water tank by use of a single wing model and a mirror plate to...conference paper 2011
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- De Kat, R. (author), Van Oudheusden, B.W. (author), Scarano, F. (author) conference paper 2008
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Violato, D. (author), Bryon, K. (author), Moore, P. (author), Scarano, F. (author)This paper describes an experimental investigation by time-resolved planar and tomographic PIV on the sound production mechanism of vortex pairing of a transitional water-jet flow at Re=5000. The shear layer is characterized by axisymmetric vortex rings which undergo pairing with a varicose mode. Three-dimensional measurements show the presence...conference paper 2010
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Elsinga, G.E. (author), Van Oudheusden, B.W. (author), Scarano, F. (author)In compressible flows particle imaging, as done in Particle Image Velocimetry (PIV), is far from trivial. The inhomogeneous refractive index field can cause aero-optical aberrations including blurring of the image, especially near optical interfaces such as shock waves. The understanding of the process causing particle image blur (or blurring of...conference paper 2005
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Kähler, C.J. (author), Cierpka, C. (author), Scharnowski, S. (author), Manhart, M. (author), Sciacchitano, A. (author), Lynch, K. (author), Scarano, F. (author), Wieneke, B. (author), Willert, C. (author), Jeon, Y. J. (author), Chatellier, L. (author), Augereau, L. (author), Tremblais, B. (author), David, L. (author)Classical Particle Image Velocimetry (PIV) uses two representations of the particle image distribution to determine the displacement of the particle image pattern by spatial cross-correlation. The accuracy and the robustness are however limited by the fact that only two representations at t and t +?t are present. Thus, only a first order...conference paper 2013
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- Van Oudheusden, B.W. (author), Scarano, F. (author), Elsinga, G.E. (author), Humble, R.A. (author), Souverein, L.J. (author) conference paper 2008
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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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- Simao Ferreira, C.J. (author), Van Bussel, G.J.W. (author), Scarano, F. (author), Van Kuik, G.A.M. (author) conference paper 2008
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Lynch, K. (author), Scarano, F. (author)A tomographic PIV system composed of a large number of cameras is used to experimentally investigate the relation between image particle density, number of cameras and the reconstruction quality. The large number of cameras allows to determine an asymptotic behavior for the object reconstruction over a wide range of values for the tracer...conference paper 2013
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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