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Article Dans Une Revue Communications in Nonlinear Science and Numerical Simulation Année : 2003

Wavelet filtering to study mixing in 2D isotropic turbulence

Résumé

This paper presents the application of coherent vortex simulation (CVS) filtering, based on an orthogonal wavelet decomposition of vorticity, to study mixing in 2D homogeneous isotropic turbulent flows. The Eulerian and Lagrangian dynamics of the flow are studied by comparing the evolution of a passive scalar and of particles advected by the coherent and incoherent velocity fields, respectively. The former is responsible for strong mixing and produces the same anomalous diffusion as the total flow, due to transport by the coherent vortices, while mixing in the latter is much weaker and corresponds to classical diffusion.

Dates et versions

hal-04110011 , version 1 (30-05-2023)

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Carsten Beta, Kai Schneider, Marie Farge. Wavelet filtering to study mixing in 2D isotropic turbulence. Communications in Nonlinear Science and Numerical Simulation, 2003, 8, pp.537-545. ⟨10.1016/S1007-5704(03)00030-3⟩. ⟨hal-04110011⟩
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