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Schrijer, F.F.J. (author), Solana Perez, Roberto (author), van Oudheusden, B.W. (author)Transonic buffet of a supercritical airfoil (OAT15A) is investigated by means of schlieren visualization and high speed PIV. The buffet conditions were observed to be strongest at M = 0.7 and a = 3.5o at a frequency of 160 Hz. By means of conditional averaging according to the shock location and movement, the typical buffet cycle is illustrated,...conference paper 2018
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Voogt, Nick (author), van Oudheusden, B.W. (author), Schrijer, F.F.J. (author)The aim of the present study is to quantify the influence of large, ribbed wall roughness elements on the mean flow and heat transfer properties of a turbulent, supersonic boundary layer (M = 2.0). Fifteen test geometries, including one smooth and fourteen rough surfaces are tested using Schlieren, PIV and QIRT. Heat transfer measurements were...conference paper 2018
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Tay, W. B. (author), de Baar, J.H.S. (author), Perçin, M. (author), Deng, S. (author), van Oudheusden, B.W. (author)Three-dimensional numerical simulations of a four-wing flapping micro aerial vehicle (FMAV) with actual experimentally captured wing membrane kinematics have been performed using an immersed boundary method Navier-Stokes finite volume solver. To successfully simulate the clap and fling motion involving the wing intersection, the numerical...journal article 2018
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Perçin, M. (author), Vanierschot, M. (author), van Oudheusden, B.W. (author)In this paper, we investigate the flow structures and pressure fields of a free annular swirling jet flow undergoing vortex breakdown. The flow field is analyzed by means of time-resolved tomographic particle image velocimetry measurements, which enable the reconstruction of the three-dimensional time-resolved pressure fields using the...journal article 2017
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van Gent, P.L. (author), Michaelis, D (author), van Oudheusden, B.W. (author), Weiss, P.E. (author), de Kat, R. (author), Laskari, A. (author), Jeon, Y.J. (author), David, L (author), Schanz, D (author), Huhn, F. (author), Gesemann, S (author), Novara, M. (author), McPhaden, C. (author), Neeteson, N. J. (author), Rival, David E. (author), Schneiders, J.F.G. (author), Schrijer, F.F.J. (author)A test case for pressure field reconstruction from particle image velocimetry (PIV) and Lagrangian particle tracking (LPT) has been developed by constructing a simulated experiment from a zonal detached eddy simulation for an axisymmetric base flow at Mach 0.7. The test case comprises sequences of four subsequent particle images (representing...journal article 2017
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Rival, David E. (author), van Oudheusden, B.W. (author)In a large variety of fluid-dynamic problems, it is often impossible to directly measure the instantaneous aerodynamic or hydrodynamic forces on a moving body. Examples include studies of propulsion in nature, either with mechanical models or living animals, wings, and blades subjected to significant surface contamination, such as icing,...journal article 2017
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De Oliveira Andrade, G.L. (author), Timmer, W.A. (author), van Oudheusden, B.W. (author)We explore integral boundary layer approximations for shear layer flows with vortex generators. The flow field is decomposed to highlight two phenomena: shear over the wall and vortex-driven mixing of the shear layer. The Navier-Stokes Equations are normalized to identify a new adimensional parameter: the vortex strength number (Vg). Usual...conference paper 2017
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Tambe, S.S. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)The physical relation between the geometry and the flow topology of the wake of a micro ramp is investigated by means of a parametric study. Various micro ramp geometries are placed in a supersonic turbulent boundary layer at a free-stream Mach number of 2. The flow field is measured with schlieren and Particle Image Velocimetry (PIV). The...conference paper 2017
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Nayak, K. (author), Giepman, R.H.M. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author)Micro-ramp vortex generators (or micro-ramps) have gained popularity as promising alternatives to boundary layer bleed for high speed flow-control applications. Micro-ramps generate a counter-rotating vortex pair which leads to a more separation resistant boundary layer. Furthermore, they modulate the size of the shock induced separation bubble...conference paper 2017
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van Gent, P.L. (author), Payanda, Qais (author), Brust, Steve (author), van Oudheusden, B.W. (author), Schrijer, F.F.J. (author)PIV measurements have been carried out to study the effect of exhaust plume and nozzle length on the flow topology and mean pressure distribution of axisymmetric base flows at freestream Mach numbers 0.76 and 2.20. Four different nozzle lengths with and without exhaust plume have been tested. The use of different nozzle lengths leads to flow...conference paper 2017
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- Deng, S. (author), Perçin, M. (author), van Oudheusden, B.W. (author), Bijl, H. (author), Remes, B.D.W. (author), Xiao, T (author) journal article 2017
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- Perçin, M. (author), van Oudheusden, B.W. (author), Remes, B.D.W. (author) journal article 2017
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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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Anantharaman, V. (author), Waterson, N. (author), Nakiboglu, G. (author), Persin, M (author), van Oudheusden, B.W. (author)The flow passing through a sharp-edged orifice is studied using two experimental techniques over a pipe Reynolds number range of 4000 to 27000. The flow separates at the orifice inlet and is accelerated through its hole in the form of a confined jet. For a given orifice, the mean reattachment length is found to remain fairly independent of the...conference paper 2016
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van Gent, P.L. (author), Gentile, V. (author), van Oudheusden, B.W. (author), Schrijer, F.F.J. (author)Quantification of surface pressure is critical for the efficient design of aerospace structures. One way of measuring pressure is PIV/PTV-based pressure reconstruction [1]. In this approach, PIV/PTV data are used to determine the material acceleration and subsequently pressure via the momentum equation. In recent years, the technique has become...conference paper 2016
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van de Meerendonk, R. (author), Perçin, M. (author), van Oudheusden, B.W. (author)This study explores the flow field and fluid-dynamic loads generated by revolving low-aspect-ratio wings. The pressure field and load characteristics are successfully reconstructed from the phase-locked tomographic measurements in three independently measured volumes along the span of the wing. The vortical structures encompass a low pressure...conference paper 2016
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Anantharaman, V. (author), Waterson, N. (author), Nakiboglu, G. (author), Perçin, M. (author), van Oudheusden, B.W. (author)Orifice plates or flow restrictions are key components used in industry for flow measurement and control. They find application in gas and liquid circuits of, e.g., lithography machines, nuclear power plants and aerospace propulsion systems [1]. They are used typically either for measuring flow-rate or to introduce a pressure drop for purposes...conference paper 2016
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- Brust, S.G. (author), van Gent, P.L. (author), Schrijer, F.F.J. (author), van Oudheusden, B.W. (author) conference paper 2016
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- Vanierschot, M. (author), Perçin, M. (author), van Oudheusden, B.W. (author) conference paper 2016