P. Henrik Alfredsson

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S. C. C. Bailey1,†, M. Hultmark2, J. P. Monty3, P. H. Alfredsson4, M. S. Chong3, R. D. Duncan5, J. H. M. Fransson4, N. Hutchins3, I. Marusic3, B. J. McKeon6, H. M. Nagib5, R. Örlü4, A. Segalini4,7, A. J. Smits2 and R. Vinuesa5 1Department of Mechanical Engineering, University of Kentucky, Lexington, KY 40506, USA 2Deparment of Mechanical and Aerospace(More)
Pressure sensitive paint (PSP) was used to measure pressure on the blades of a radial compressor with a 51 mm inlet diameter rotating at speeds up to 50 krpm using the so called lifetime method. A diode laser with a scanning-mirror system was used to illuminate the paint and the luminescent lifetime was registered using a photo multiplier. With the(More)
This paper reports the first turbulence measurements performed in the Long Pipe Facility at the Center for International Cooperation in Long Pipe Experiments (CICLoPE). In particular, the Reynolds stress components obtained from a number of straight and boundary-layer-type single-wire and X-wire probes up to a friction Reynolds number of 3.8×104 are(More)
A new model to determine the spectral velocity tensor in a stably stratified flow is proposed. This model is complementary to the Mann model as it solves the stratified inviscid Rapid Distortion Theory equations analytically, allowing for the determination of the single and two-point velocity spectra as well as the temperature-velocity cross-spectra. The(More)
For pressure-driven turbulent channel flows undergoing spanwise system rotation, it has been observed that the absolute vorticity, i.e., the sum of the averaged spanwise flow vorticity and system rotation, tends to zero in the central region of the channel. This observation has so far eluded a convincing theoretical explanation, despite experimental and(More)
We present applications of the visiometrics approach, which emphasizes the quanti cation of diagnostics to obtain physical insight into complex physical processes. This methodology is applied to study both the vortex collapse problem via Biot-Savart reduced models as well as the exploration of Navier-Stokes turbulence direct simulations with a 512 3 mesh(More)
Wind energy is one of the fastest growing sources of sustainable energy production. As more wind turbines are coming into operation, the best locations are already becoming occupied by turbines, and wind-farm developers have to look for new and still available areas-locations that may not be ideal such as complex terrain landscapes. In these locations,(More)
Although the equations governing turbulent flow of fluids are well known, understanding the overwhelming richness of flow phenomena, especially in high Reynolds number turbulent flows, remains one of the grand challenges in physics and engineering. High Reynolds number turbulence is ubiquitous in aerospace engineering, ground transportation systems, flow(More)
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