Abstract
An attempt to extract multi-scaled vortical structures from a turbulent field is carried out. The Lattice Boltzmann method with forcing is used to generate a statistically stationary velocity field in a resolution of 2563. Two methods for filtering, namely the Fourier and wavelet decompositions, are used in the investigation and the results are compared. Three fields that contain vortical structures of different-scales area extracted from the original turbulent field. It is found that the results obtained by the two methods overlap at a high rate. Several universal characteristics among the filtered flow fields are found in the comparisons using the invariants of the velocity gradient, rotation and deformation tensors.
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