caa a22 4500 606198997 CHVBK 20210128100936.0 cr unu---uuuuu 210128e20150201xx s 000 0 eng 10.1007/s00348-015-1902-1 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1902-1 Tomo-PIV measurement of flow around an arbitrarily moving body with surface reconstruction [Elektronische Daten] [Sunghyuk Im, Young Jeon, Hyung Sung] A three-dimensional surface of an arbitrarily moving body in a flow field was reconstructed using the DAISY descriptor and epipolar geometry constraints. The surface shape of a moving body was reconstructed with tomographic PIV flow measurement. Experimental images were captured using the tomographic PIV system, which consisted of four high-speed cameras and a laser. The originally captured images, which contained the shape of the arbitrary moving body and the tracer particles, were separated into the particle and surface images using a Gaussian smoothing filter. The weak contrast of the surface images was enhanced using a local histogram equalization method. The histogram-equalized surface images were used to reconstruct the surface shape of the moving body. The surface reconstruction method required a sufficiently detailed surface pattern to obtain the intensity gradient profile of the local descriptor. The separated particle images were used to reconstruct the particle volume intensity via tomographic reconstruction approaches. Voxels behind the reconstructed body surface were neglected during the tomographic reconstruction and velocity calculation. The three-dimensional three-component flow vectors were calculated based on the cross-correlation functions between the reconstructed particle volumes. Three-dimensional experiments that modeled the flows around a flapping flag, a rotating cylinder, and a flapping robot fish tail were conducted to validate the present technique. Springer-Verlag Berlin Heidelberg, 2015 Im Sunghyuk Department of Mechanical Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Korea aut Jeon Young Institut P PRIME, UPR3346, CNRS - Université de Poitiers - ISAE-ENSMA, 11 Boulevard Marie et Pierre Curie, 86962, Futuroscope Cedex, France aut Sung Hyung Department of Mechanical Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Korea aut Experiments in Fluids Springer Berlin Heidelberg 56/2(2015-02-01), 1-16 0723-4864 56:2<1 2015 56 348 https://doi.org/10.1007/s00348-015-1902-1 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s00348-015-1902-1 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Im Sunghyuk Department of Mechanical Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Korea aut NATIONALLICENCE 700 1- Jeon Young Institut P PRIME, UPR3346, CNRS - Université de Poitiers - ISAE-ENSMA, 11 Boulevard Marie et Pierre Curie, 86962, Futuroscope Cedex, France aut NATIONALLICENCE 700 1- Sung Hyung Department of Mechanical Engineering, KAIST, 291 Daehak-ro, Yuseong-gu, 305-701, Daejeon, Korea aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/2(2015-02-01), 1-16 0723-4864 56:2<1 2015 56 348