OSMOSE. Pression osmotique p [mmHg] p = f(nombre de particules) p f(nature des particules)
Velocimetrie par Images de Particules · Microsoft PowerPoint - pres_ms.ppt [Mode de...
Transcript of Velocimetrie par Images de Particules · Microsoft PowerPoint - pres_ms.ppt [Mode de...
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M. Stanislas, Ecole Centrale de Lille
Laboratoire de Mécanique de Lille
Velocimetrie par Images de Particules
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Vocabulaire
PIV Standard : 2D2CSPIV : 2D3CTomo PIV : 3D3CMicro PIVLong range Micro PIV
HR PIVTR PIV
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TOC
• Précision
• Résolution spatiale
• 3D3C
• TR PIV
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Paramètres importants
• Taille des images de particules
• Qualité des images de particules
• Concentration en particules
• Calibration (correction)
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Algorithmes
• Multipasses/Multigrilles
• Déformation de l’image
• Flow Optic
• Correlation d’ensemble
• PTV
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Précision
Influence de la concentration
Influence de la 3ème composante
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Influence du gradient dans la fenêtre
Précision
"Characterization of different PIV algorithms using the Europiv Synthetic Image Generator and real images from turbulent boundary layer." B. MILLIAT, J.M. FOUCAUT, N. PERENNE, M. STANISLAS In Particle Image Velocimetry : proceedings of the EUROPIV 2 open workshop held in Zaragoza on March 31st & April 1st 2003, Springer Verlag, 2004.
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Précision PIV uncertainty quantification by image matching. A. Sciacchitano, B. Wieneke, F. Scarano, Meas. Sci. Technol. 24 (2013)
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Précision
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Précision
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PIV optimization for the study of turbulent flow using spectral analysisJ M Foucaut, J Carlier and M Stanislas, Meas. Sci. Technol. 15 (2004) 1046–1058
Précision : Turbulence
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Précision On the uncertainty of digital PIV and PTV near walls. C. J. Kähler, S. Scharnowski, C. Cierpka, Exp Fluids (2012) 52:1641–1656
Window Correlation Ensemble correlation PTV
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Précision
gradient de vitesse Ensemble correlation PTV
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• DSR pour 4000 pixels:
PIV 16x16 ~ 250
Correlation d’ensemble ~ 2000
PTV ~ 25000
• PTV : ensemencement inhomogène, gradientsnon constants, près des parois.
• Correlation d’ensemble : pour les grandeursmoyennes
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Précision Parallax correction for precise near-wall flow investigations using particle imaging. C. Cierpka, S. Scharnowski, and C. J. Kähler, Applied Optics Vol. 52, No. 12 / 2013.
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Précision
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Précision PIV uncertainty quantification by image matching. A. Sciacchitano, B. Wieneke, F. Scarano, Meas. Sci. Technol. 24 (2013)
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Précision
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Optical set-up
• Point Spread Function : Edmund Optics MO, f = 20 mm, spotsize = 2.5 m
• Particle simulation : Pentax 67II , f = 105, f# = 2.4, spotsize 2-3 pixels
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PSF & PS scanning
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Particle simulation
Flowmaster
Phantom
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Particle displacement simulation
Flowmaster
Phantom
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Particle displacement simulation
Flowmaster Phantom
• RMS error on position ± 0.03 pix. for Flowmaster± 0.05 pix. for Phantom
• Interest of super-resolution PIV
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Résolution spatiale
Réponse à unéchelon de vitesse
On the resolution limit of digital particle image velocimetry. C. J. Kähler, S. Scharnowski , C. Cierpka, Exp Fluids (2012) 52:1629–1639
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Tomographic PIV: principles and practice, F Scarano, Meas. Sci. Technol. 24 (2013)
3D3C
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Low speed turbulent boundary layerHigh-res backward facing step
3D3C
Transitional jet
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3D3C
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TRPIV
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TRPIV
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Conclusion
• Ca bouge!
• Il faut savoir ce que l’on veut…
• 4ème Challenge international de PIVLisbonne juillet 2014