Artículo
Wavelet decomposition of forced turbulence: Applicability of the iterative Donoho-Johnstone threshold
Fecha de publicación:
02/2012
Editorial:
American Institute of Physics
Revista:
Physics of Fluids
ISSN:
1070-6631
Idioma:
Inglés
Tipo de recurso:
Artículo publicado
Clasificación temática:
Resumen
We examine the decomposition of forced Taylor-Green and Arn'old-Beltrami-Childress (ABC) flows into coherent and incoherent components using an orthonormal wavelet decomposition. We ask whether wavelet coefficient thresholding based on the Donoho-Johnstone criterion can extract a coherent vortex signal while leaving behind Gaussian random noise. We find that no threshold yields a strictly Gaussian incoherent component, and that the most Gaussian incoherent flow is found for data compression lower than that achieved with the fully iterated Donoho-Johnstone threshold. Moreover, even at such low compression, the incoherent component shows clear signs of large-scale spatial correlations that are signatures of the forcings used to drive the flows. © 2012 American Institute of Physics.
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Articulos(IFIBA)
Articulos de INST.DE FISICA DE BUENOS AIRES
Articulos de INST.DE FISICA DE BUENOS AIRES
Citación
Lord, Jesse W.; Rast, Mark P.; Mckinlay, Christopher; Clyne, John; Mininni, Pablo Daniel; Wavelet decomposition of forced turbulence: Applicability of the iterative Donoho-Johnstone threshold; American Institute of Physics; Physics of Fluids; 24; 2; 2-2012; 2510201-2510214
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