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Updated: Jun 25, 2026

Three-dimensional Particle Tracking Velocimetry for Turbulence Applications: Case of a Jet Flow
Published on: February 27, 2016
Evolution of the acceleration field and a reformulation of the sweeping decorrelation hypothesis in two-dimensional
F Schwander1, E Hascoët, J C Vassilicos
1Department of Aeronautics, Imperial College, London SW7 2AZ, United Kingdom. frederic.schwander03@imperial.ac.uk
Abstract:
From simulations of two-dimensional inverse energy cascading turbulence, we show that points with low acceleration values are predominantly advected by the local fluid velocity. The fluid velocity u in the global frame and the fluid velocity u in the frame moving with a low-acceleration point are approximately statistically independent. This property remains valid in high-acceleration regions but only in the direction of the local acceleration vector. In the perpendicular direction, the acceleration velocity V_a=u-xi is approximately independent of xi everywhere. These statistical independences constitute our formulation of the sweeping decorrelation hypothesis for two-dimensional inverse energy cascading turbulence.
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