Fundamental and Experimental Aerodynamics
3D3C Tomographic PIV - under construction
Three-component displacement in a volume
Figure 1: General principle of tomographic PIV (reprinted from Elsinga et al. 2006, see references below).
In order to determine the flow velocity in a volume, tomographic PIV requires additional cameras compared to 2D2C and 2D3C PIV, typically four, and adapted optics to illuminate a thick volume in the seeded flow. With such a setup (see an example in Figure 1), one records projections of the volumic particle images. A tomographic reconstruction step is thus necessary, in which the position of the particles in the volumes for the two time instant are reconstructed from these projections. Once this is done, the three-dimensional velocity can be determined by adding a spatial dimension in the classical cross-correlation approaches.
Currently, the MTRO team is upgrading its high-speed PIV system in order to comply with high-speed tomographic requirements. Simultaneously, the ALPIV team is working on both tomographic reconstruction and three-dimensional velocity estimation, under the Carnot TOMOPIV contract.
References
[1] Elsinga G.E., Scarano F., Wieneke B., van Oudheusden B.W., Tomographic particle image velocimetry, Exp. Fluids 41:933-947, 2006.
