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Journal Articles Experiments in Fluids Year : 2019

Fast 3D flow reconstructions from 2D cross-plane observations


A computationally efficient flow reconstruction technique is proposed, exploiting homo-geneity in a given direction, to recreate three dimensional instantaneous turbulent velocity fields from snapshots of two dimension planar fields. This methodology, termed as 'snap-shot optimisation' or SO, can help provide 3D data-sets for studies which are currently restricted by the limitations of experimental measurement techniques. The SO method aims at optimising the error between an inlet plane with a homogeneous direction and snapshots, obtained over a sufficient period of time, on the observation plane. The observations are carried out on a plane perpendicular to the inlet plane with a shared edge normal to the homogeneity direction. The method is applicable to all flows which display a direction of homogeneity such as cylinder wake flows, channel flow, mixing layer, and jet (axi-symmetric). The ability of the method is assessed with two synthetic data-sets, and three experimental PIV data-sets. A good reconstruction of the large-scale structures are observed for all cases. The small-scale reconstruction ability is partially limited especially for higher-dimensional observation systems. POD based SO method and averaging SO variations of the method are shown to reduce discontinuities created due to temporal mismatch in the homogenous direction providing a smooth velocity reconstruction. The volumetric reconstruction is seen to capture large-scale structures for synthetic and experimental case-studies. The algorithm run-time is found to be in the order of a minute providing results comparable with the reference. Such a reconstruction methodology can provide important information for data assimilation in the form of initial condition, background condition, and 3D observations.
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hal-02012453 , version 1 (08-02-2019)



Pranav Chandramouli, Etienne Mémin, Dominique Heitz, Lionel Fiabane. Fast 3D flow reconstructions from 2D cross-plane observations. Experiments in Fluids, 2019, 60 (2), pp.1-27. ⟨10.1007/s00348-018-2674-1⟩. ⟨hal-02012453⟩
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