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Open data
Many boundary layer data are available. Most of them are available on the TurbBase website. On request, and for those not available on TurBase, there can be accessible via the LMFL, for that please contact us.
Flat plate turbulent boundary layer
The experiment was performed in the LMFL 20 m long boundary layer facility. It is composed of two Stereo-PIV systems acquired simultaneously. The Reynolds numbers is Reθ = 7500 or Reτ = 2300. The two PIV planes are normal to the wall and intersect into a single line so that the set-up has a ‘L’ shape. Each PIV system is composed of two Hamamatsu cameras with a resolution of 2k by 2k capturing two fields of view of about 80 mm in the spanwise or streamwise direction and 120 mm in the wall normal one. To obtained good statistics, 12000 snapshots have been recorded.
The experiment was performed in the LML 20 m long boundary layer facility which allows to obtain boundary layer thickness δ of the order of 30 cm. It is composed of four Hamamatsu 2k by 2k cameras acquired simultaneously to obtain a large field of view of about 4δ in the streamwise direction and 1δ in the wall normal one with a good special resolution. Two Reynolds numbers have been recorded, Reθ = 7500 and Reθ = 20000, corresponding to a free-stream velocity of 3 and 10 m/s respectively. To obtained good statistics, about 29000 snapshots for the 3m/s case and 22000 for the 10 m/s one have been acquired. This experiment is designed to study the large scale structures which develop in the outer region of turbulent boundary layer.
The experiment was performed in the LML 20 m long boundary layer facility which allows to obtain boundary layer thickness δ of the order of 30 cm. It is composed of a spanwise stereo-PIV plane synchronized with unsteady pressure measurements at the wall and for various positions inside the boundary layer. The spanwise SPIV plan is composed of four Hamamatsu 2k by 2k cameras to capture the full boundary layer thickness with a good special resolution. For each of the nine pressure probe positions from the wall, 10000 snapshots have been recorded to unsure good statistical convergence. Also, for each case, the wall pressure fluctuations have been also recorded at the same time. Finally, the experiment has been conducted for three free-stream velocities (3, 5 and 10 m/s) corresponding to momentum Reynolds number of 7300, 10000 and 18000.
The dataset provide the mean velocities and Reynolds stresses profiles obtained with hot-wire anemometry for different momentum Reynolds number (8200, 11500, 14500, 21000) in the LMFL boundary layer wind tunnel.
The dataset provide the velocity fields obtained from multiple SPIV planes (streamwise wall normal, spanwise wall normal, wall parallel planes and dual planes) for different momentum Reynolds number (7800 and 15000) in the LMFL boundary layer wind tunnel..
Streamwise planes (direction of the flow) : 2000 fields
Horizontal planes (parallel to wall) : 3 heights of 1000 fields each
Spanwise planes (Normal to flow direction) : 2000 fields
Two experiments of flat plate turbulent boundary layer at high Reynolds number were carried out in the Laboratoire de Mecanique des Fluides de Lille (LMFL) wind tunnel. Both are using the same High Speed Stereoscopic PIV setup, but at different velocities. The first one was done in the frame of the ANR CALINS on the LML side only. The second experiment was done in the frame of the WallTurb European project jointly with LEA UMR CNRS 6609 from Poitiers (France) and Chalmers University (Sweden). For the later, the simultaneous recording of 143 hot wires and a High Speed Stereoscopic PIV was performed. The PIV results show a blockage effect which seems not to affect the turbulence organization. The WallTurb experiment was carried out at two momemtum Reynolds numbers (10000 and 19000) and the CALINS one at 7500.
EUHIT ramp, favorable pressure gradient (FPG) and adverse pressure gradient (APG)
The aim of this dataset is to describe in details the wind tunnel and the ramp model used for the EUHIT APG experiment. The pressure and pressure gradient distribution on the ramp and on the wind tunnel top wall are also provided with the CAD design of the ramp. Finally, for numerical comparisons, the combined PIV results fields plots (U, V, urms, vrms, uv) of the FPG and APG experiments are also provided there.
The dataset has been acquired at the LMFL in May 2015 by the DLR-Cologne group. It consists on near-wall boundary layer profile measurements obtained with high-speed long-range micro-PIV (camera PCO Dimax-S4 and sCMOS (for higher magnification) equipped with a telephoto lens (Zeiss 300mm/f2.8) with a 100 mm extension tube). Profiles were acquired at three different positions in the adverse pressure gradient (APG) region (at 0.483 m, 1.733 m and at 2.358 m from the beginning of the APG region). Also, in order to provide inlets conditions for numerical simulation, two profiles were done upstream of the model at 3.2 m and 6.8 m from wind tunnel tripping device. The profiles were done for the two free-stream velocities studied during the campaign. The employed PIV measurement approach closely follows the procedures and methods laid out in Willert 2015 (High-speed particle image velocimetry for the efficient measurement of turbulence statistics. Exp Fluids 56:17, doi 10.1007/s00348-014-1892-4).
The dataset has been acquired at the LMFL in Lille in May 2015. 16 sCMOS cameras were used in order to capture a field with a size of 3455 x 255 mm with a high spatial resolution. Two Reynolds numbers were realized and a number of 30,000 double pair images per Reynolds number and camera were acquired in order to allow for a reliable computation of statistics.
The dataset has been acquired at the LMFL in Lille by the DLR group. The objective is to provide new fundamental knowledge regarding the spanwise organization of the large-scale structures in turbulent boundary layers with adverse pressure gradients. For that, a stereo-PIV spanwise plane was realized with 4 sCMOS cameras forming a field of view of 325 mm by 122 mm. Two stations in the APG region (at 595 and 2192 mm from the beginning of the -5° ramp) was studied at the two free-stream velocities investigated during the EUHIT campaign. For each test cases, 20 000 velocity fields were recorded in order to provide good statistics.
The dataset has been acquired at the LMFL in Lille. The objective is to characterize the flow which develops on the 1.5° ramp with a favorable pressure gradient (FPG). The experiment was conducted into two steps, the first one with two sCMOS cameras capturing a field with a size of 46.5 cm in the streamwise direction and 19.8 cm in the wall normal direction close to the end of the plate, and the second one with also two sCMOS cameras capturing each a field of view of 23.6 cm in the streamwise direction and 19.5 cm in the wall normal one. The first camera field of view was at the beginning of the plate and the second one close to the middle. Two Reynolds numbers were realized and in order to obtain reliable statistics, 30 000 velocity fields were acquired for the first case and 10 000 for the second one.