caa a22 4500 606197982 CHVBK 20210128100932.0 cr unu---uuuuu 210128e20150301xx s 000 0 eng 10.1007/s00348-015-1934-6 doi (NATIONALLICENCE)springer-10.1007/s00348-015-1934-6 An efficient and accurate approach to MTE-MART for time-resolved tomographic PIV [Elektronische Daten] [K. Lynch, F. Scarano] The motion-tracking-enhanced MART (MTE-MART; Novara et al. in Meas Sci Technol 21:035401, 2010) has demonstrated the potential to increase the accuracy of tomographic PIV by the combined use of a short sequence of non-simultaneous recordings. A clear bottleneck of the MTE-MART technique has been its computational cost. For large datasets comprising time-resolved sequences, MTE-MART becomes unaffordable and has been barely applied even for the analysis of densely seeded tomographic PIV datasets. A novel implementation is proposed for tomographic PIV image sequences, which strongly reduces the computational burden of MTE-MART, possibly below that of regular MART. The method is a sequential algorithm that produces a time-marching estimation of the object intensity field based on an enhanced guess, which is built upon the object reconstructed at the previous time instant. As the method becomes effective after a number of snapshots (typically 5-10), the sequential MTE-MART (SMTE) is most suited for time-resolved sequences. The computational cost reduction due to SMTE simply stems from the fewer MART iterations required for each time instant. Moreover, the method yields superior reconstruction quality and higher velocity field measurement precision when compared with both MART and MTE-MART. The working principle is assessed in terms of computational effort, reconstruction quality and velocity field accuracy with both synthetic time-resolved tomographic images of a turbulent boundary layer and two experimental databases documented in the literature. The first is the time-resolved data of flow past an airfoil trailing edge used in the study of Novara and Scarano (Exp Fluids 52:1027-1041, 2012); the second is a swirling jet in a water flow. In both cases, the effective elimination of ghost particles is demonstrated in number and intensity within a short temporal transient of 5-10 frames, depending on the seeding density. The increased value of the velocity space-time correlation coefficient demonstrates the increased velocity field accuracy of SMTE compared with MART. The Author(s), 2015 Lynch K. Aerospace Engineering Department, Delft University of Technology, 2629 HS, Delft, The Netherlands aut Scarano F. Aerospace Engineering Department, Delft University of Technology, 2629 HS, Delft, The Netherlands aut Experiments in Fluids Springer Berlin Heidelberg 56/3(2015-03-01), 1-16 0723-4864 56:3<1 2015 56 348 https://doi.org/10.1007/s00348-015-1934-6 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/s00348-015-1934-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Lynch K. Aerospace Engineering Department, Delft University of Technology, 2629 HS, Delft, The Netherlands aut NATIONALLICENCE 700 1- Scarano F. Aerospace Engineering Department, Delft University of Technology, 2629 HS, Delft, The Netherlands aut NATIONALLICENCE 773 0- Experiments in Fluids Springer Berlin Heidelberg 56/3(2015-03-01), 1-16 0723-4864 56:3<1 2015 56 348