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.