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Your search keyword '"Laval, J. P."' showing total 15 results
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15 results on '"Laval, J. P."'

1. Extensive characterization of a high Reynolds number decelerating boundary layer using advanced optical metrology

Author

Cuvier, C., Srinath, S., Stanislas, M., Foucaut, J. -M., Laval, J. -P., Kähler, C. J., Hain, R., Scharnowski, S., Schröder, A., Geisler, R., Agocs, J., Röse, A., Willert, C., Klinner, J., Amili, O., Atkinson, C., and Soria, J.

Subjects
Physics - Fluid Dynamics
Abstract

An experiment conducted in the framework of the EUHIT project and designed to characterize large scale structures in an adverse pressure gradient boundary layer flow is presented. Up to 16 sCMOS cameras were used in order to perform large scale turbulent boundary layer PIV measurements with a large field of view and appropriate spatial resolution. To access the span-wise / wall-normal signature of the structures as well, stereoscopic PIV measurements in span-wise/wall-normal planes were performed at specific stream-wise locations. To complement these large field of view measurements, long-range micro-PIV, time resolved near wall velocity profiles and film-based measurements were performed in order to determine the wall-shear stress and its fluctuations at some specific locations along the model., Comment: 50 pages

Published
2017
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9. Multi-PIV Measurements of an Adverse Pressure Gradient Turbulent Boundary Layer

Author

Willert, Christian, Kähler, Christian, Schröder, Andreas, Soria, Julio, Stanislas, Michel, Foucaut, J. M., Scharnowski, Sven, Hain, Rainer, Klinner, Joachim, Agocs, Janos, Geisler, Reinhard, Röse, Anni, Atkinson, Callum, Amili, Omid, Cuvier, Chrstoph, Srinath, S., and Laval, J. P.

Subjects
PIV, particle Image velocimetry, turbulence, Triebwerksmesstechnik, turbulent boundary layer, near-wall flow, pressure gradient, Experimentelle Verfahren, micro-PIV
Abstract

We report on a multi-national measurement campaign aimed at providing highly resolved flow field data of a turbulent boundary layer subjected to an adverse pressure gradient (APG). In the case of APGs the structure and dynamics of large scale turbulent flow structures along with their significance on the statistical properties of the flow is not well understood. Hence the fundamental aim was to resolve and characterise the large-scale coherent structures in an APG boundary layer flow. In addition to large-field-of-view PIV measurements using 16 sCMOS cameras along a 3.5m length, stereoscopic PIV measurements were performed at specific locations in order to also resolve the span-wise velocity statistics. Long-distance, high-speed micro-PIV measurements provided near wall statistics at selected locations including the time-resolved wall shear stress. The measurements were performed in the boundary layer wind tunnel of the Laboratoire de Mécanique de Lille (LML) and funded by EuHIT (www.euhit.org).

Published
2016

11. Extensive characterisation of a high Reynolds number decelerating boundary layer using advanced optical metrology

Author

Cuvier, C., primary, Srinath, S., additional, Stanislas, M., additional, Foucaut, J. M., additional, Laval, J. P., additional, Kähler, C. J., additional, Hain, R., additional, Scharnowski, S., additional, Schröder, A., additional, Geisler, R., additional, Agocs, J., additional, Röse, A., additional, Willert, C., additional, Klinner, J., additional, Amili, O., additional, Atkinson, C., additional, and Soria, J., additional

Published
2017
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14. CXCR1 Regulates Pulmonary Anti-PseudomonasHost Defense

Author

Carevic, M., Öz, H., Fuchs, K., Laval, J., Schroth, C., Frey, N., Hector, A., Bilich, T., Haug, M., Schmidt, A., Autenrieth, S.E., Bucher, K., Beer-Hammer, S., Gaggar, A., Kneilling, M., Benarafa, C., Gao, J.L., Murphy, P.M., Schwarz, S., Moepps, B., and Hartl, D.

Abstract

Pseudomonas aeruginosais a key opportunistic pathogen causing disease in cystic fibrosis (CF) and other lung diseases such as chronic obstructive pulmonary disease (COPD). However, the pulmonary host defense mechanisms regulating anti-P. aeruginosaimmunity remain incompletely understood. Here we demonstrate, by studying an airway P. aeruginosainfection model, in vivo bioluminescence imaging, neutrophil effector responses and human airway samples, that the chemokine receptor CXCR1 regulates pulmonary host defense against P. aeruginosa. Mechanistically, CXCR1 regulates anti-Pseudomonasneutrophil responses through modulation of reactive oxygen species and interference with Toll-like receptor 5 expression. These studies define CXCR1 as a novel, noncanonical chemokine receptor that regulates pulmonary anti-Pseudomonashost defense with broad implications for CF, COPD and other infectious lung diseases.

Published
2016
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15. Effect of mean pressure gradient on the turbulent wall pressure–velocity correlations.

Author

Shinde, Vilas J., Laval, J.-P., and Stanislas, M.

Subjects
*TURBULENT boundary layer, *TURBULENCE, *COMPUTER simulation, *WALL pressure (Aerodynamics), *BOUNDARY layer (Aerodynamics)
Abstract

Two-point correlations of the wall fluctuating pressure and turbulent pressure and velocities in the flow field are computed in three dimensions using direct numerical simulation (DNS) databases. The mean pressure gradient in the flow has strong influence on these correlations. The DNS () in a converging/diverging channel with streamwise curvature near the lower wall is used to compute the statistics. The correlations in favourable pressure gradient and adverse pressure gradient are compared with the correlation in flat channel flow DNS (). The results show that these pressure–pressure and pressure–velocity correlations are not only sensitive to the local pressure gradient and wall curvature, but also to the pressure gradient history. [ABSTRACT FROM PUBLISHER]

Published
2014
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