Abstract
We analyze vorticity fields obtained from direct numerical simulations (DNS) of statistically stationary two-dimensional turbulence where the forcing is done in wavelet space. We introduce a new eduction method for extracting coherent structures from two-dimensional turbulent flows. Using a nonlinear wavelet technique based on an objective universal threshold we separate the vorticity field into coherent structures and background flow. Both components are multi-scale with different scaling laws, and therefore cannot be separated by Fourier filtering. We find that the coherent structures have non-Gaussian statistics while the background flow is Gaussian, and we discuss the implications of this result for turbulence modelling.
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Farge, M., Schneider, K., Kevlahan, N.KR. (1998). Coherent Structure Eduction in Wavelet-Forced Two-Dimensional Turbulent Flows. In: Krause, E., Gersten, K. (eds) IUTAM Symposium on Dynamics of Slender Vortices. Fluid Mechanics and Its Applications, vol 44. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-5042-2_6
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DOI: https://doi.org/10.1007/978-94-011-5042-2_6
Publisher Name: Springer, Dordrecht
Print ISBN: 978-94-010-6117-9
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