caa a22 4500 606197702 CHVBK 20210128100930.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s00348-015-2003-x doi (NATIONALLICENCE)springer-10.1007/s00348-015-2003-x Quantitative wake analysis of a freely swimming fish using 3D synthetic aperture PIV [Elektronische Daten] [Leah Mendelson, Alexandra Techet] Synthetic aperture PIV (SAPIV) is used to quantitatively analyze the wake behind a giant danio (Danio aequipinnatus) swimming freely in a seeded quiescent tank. The experiment is designed with minimal constraints on animal behavior to ensure that natural swimming occurs. The fish exhibits forward swimming and turning behaviors at speeds between 0.9 and 1.5 body lengths/second. Results show clearly isolated and linked vortex rings in the wake structure, as well as the thrust jet coming off of a visual hull reconstruction of the fish body. As a benchmark for quantitative analysis of volumetric PIV data, the vortex circulation and impulse are computed using methods consistent with those applied to planar PIV data. Volumetric momentum analysis frameworks are discussed for linked and asymmetric vortex structures, laying a foundation for further volumetric studies of swimming hydrodynamics with SAPIV. Additionally, a novel weighted refocusing method is presented as an improvement to SAPIV reconstruction. Springer-Verlag Berlin Heidelberg, 2015 Mendelson Leah Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut Techet Alexandra Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut Experiments in Fluids Springer Berlin Heidelberg 56/7(2015-07-01), 1-19 0723-4864 56:7<1 2015 56 348 https://doi.org/10.1007/s00348-015-2003-x 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/s00348-015-2003-x text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mendelson Leah Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut NATIONALLICENCE 700 1- Techet Alexandra Department of Mechanical Engineering, Massachusetts Institute of Technology, Cambridge, MA, USA aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/7(2015-07-01), 1-19 0723-4864 56:7<1 2015 56 348