Wavelet decomposition of forced turbulence: Applicability of the iterative Donoho-Johnstone threshold
| Autor: | Jesse W. Lord, Pablo D. Mininni, Mark Rast, Christopher Mckinlay, John Clyne |
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| Rok vydání: | 2012 |
| Předmět: |
Iterative method
Ciencias Físicas Gaussian Computational Mechanics purl.org/becyt/ford/1 [https] Physics::Fluid Dynamics symbols.namesake Wavelet Optics COHERENT STRUCTURES Compression (functional analysis) Orthonormal basis Statistical physics Fluid Flow and Transfer Processes Physics business.industry NUMERICAL SIMULATIONS Mechanical Engineering purl.org/becyt/ford/1.3 [https] VORTEX DYNAMICS Condensed Matter Physics Thresholding Astronomía Mechanics of Materials Gaussian noise COMPUTATIONAL METHODS symbols business CIENCIAS NATURALES Y EXACTAS Data compression |
| Zdroj: | CONICET Digital (CONICET) Consejo Nacional de Investigaciones Científicas y Técnicas instacron:CONICET |
| ISSN: | 1089-7666 1070-6631 |
| Popis: | 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. Fil: Lord, Jesse W.. University of Colorado; Estados Unidos Fil: Rast, Mark P.. University of Colorado; Estados Unidos Fil: Mckinlay, Christopher. National Center for Atmospheric Research; Estados Unidos. University of California at Los Angeles; Estados Unidos Fil: Clyne, John. National Center for Atmospheric Research; Estados Unidos Fil: Mininni, Pablo Daniel. National Center for Atmospheric Research; Estados Unidos. Universidad de Buenos Aires; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Ciudad Universitaria. Instituto de Física de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Física de Buenos Aires; Argentina |
| Databáze: | OpenAIRE |
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