Flow Structure Detection with Smoothed Particle Hydrodynamics

Tóth, Balázs and Szabó K., Gábor (2014) Flow Structure Detection with Smoothed Particle Hydrodynamics. In: Proceedings of the 9th SPHERIC International Workshop. Proceedings of the 9th SPHERIC International Workshop . [s. n.], Paris, pp. 208-215. ISBN 88-7617-020-0

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Abstract

We discuss how existing flow structure detection methods can be realised in Smoothed Particle Hydrodynamcs (SPH) simulations. We demonstrate the use of the Delta criterion for the detection of instantaneous Eulerian flow structures. The standard calculation of the velocity gradient tensor (VGT) results too noisy gradient field. We propose a correction method based on the idea of XSPH that yields a much smoother VGT field, enabling significantly more accurate structure detection. We also demonstrate on test cases the process in which the instantaneous Eulerian tools are used to locate Lagrangian coherent flow structures.

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