A tomographic PIV resolution study based on homogeneous isotropic turbulence DNS data
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In order to accurately assess measurement resolution and measurement uncertainty in DPIV and TPIV measurements, a series of simulations were conducted based on the flow field from a homogeneous isotropic turbulence data set (Re λ = 141). The effect of noise and spatial resolution was quantified by examining the local and global errors in the velocity, vorticity and dissipation fields in addition to other properties of interest such as the flow divergence, topological invariants and energy spectra. In order to accurately capture the instantaneous gradient fields and calculate sensitive quantities such as the dissipation rate, a minimum resolution of x/η = 3 is required, with smoothing recommended for the TPIV results to control the inherently higher noise levels. Comparing these results with experimental data showed that while the attenuation of velocity and gradient quantities was predicted well, higher noise levels in the experimental data led increased divergence.
KeywordsInterrogation Window Particle Tracking Velocimetry Digital Particle Image Velocimetry Homogeneous Isotropic Turbulence Interrogation Window Size
Dr. Tanahashi of Tokyo Tech is acknowledged for the DNS data. The first author wishes to acknowledge funding from the Engineering and Physical Sciences Research Council, through a Cambridge University Doctoral Training Award.
- Atkinson C, Soria J (2009) An efficient simultaneous reconstruction technique for tomographic particle image velocimetry. Exp Fluids, p 116Google Scholar
- Maas H, Gruen A, Papantoniou D (2004) Particle tracking velocimetry in three-dimensional flows. Exp Fluids 15:133–146Google Scholar
- Raffel M, Willert C, Kompenhans J (1998) Particle image velocimetry: a practical guide. Springer, New YorkGoogle Scholar
- Schröder A, Geisler R, Elsinga G, Scarano F, Dierksheide U (2006) Investigation of a turbulent spot using time-resolved tomographic PIV. In: 13th international symposium on applications of laser techniques to fluid mechanics, Lisbon, PortugalGoogle Scholar
- Tanahashi M, Miyauchi T, Ikeda J (1999) Fine scale structure in turbulence, fluid mechanics and its application. In: IUTAM Symposium on simulation and identification of organized structures in flows, fluid mechanics and its applications, vol 52. pp 131–140Google Scholar
- Wieneke B (2007) Volume self-calibration for stereo-PIV and tomographic-PIV. In: 7th international symposium on particle image velocimetry, Rome, ItalyGoogle Scholar
- Wieneke B, Taylor S (2006) Fat-sheet PIV with computation of full 3D-strain tensor using tomographic reconstruction. In: 13th international symposium on applications of laser techniques to fluid mechanics, Lisbon, PortugalGoogle Scholar
- Worth N, Nickels T (2007) A computational study of tomographic reconstruction accuracy and the effects of particle blocking. In: 5th Joint ASME/JSME Fluids Engineering Conference, San Diego, CaliforniaGoogle Scholar