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Title: Generalized Batchelor functions of isotropic turbulence
Authors: Gravanis, Elias 
Akylas, Evangelos 
Keywords: Spectroscopy
Autocorrelation functions
Bottleneck effects
Degree of accuracy
Issue Date: 11-Jan-2015
Publisher: American Institute of Physics Inc.
Source: Physics of Fluids Volume 27, Issue 1, January 09, 2015, Article number 1.4905326
Abstract: We generalize Batchelor's parameterization of the autocorrelation functions of isotropic turbulence in a form involving a product expansion with multiple small scales. The richer small scale structure acquired this way, compared to the usual Batchelor function, is necessary so that the associated energy spectrum approximate well actual spectra in the universal equilibrium range. We propose that the generalized function provides an approximation of arbitrary accuracy for actual spectra of isotropic turbulence over the universal equilibrium range. The degree of accuracy depends on the number of higher moments which are determinable and it is reflected in the number of small scales involved. The energy spectrum of the generalized function is derived, and for the case of two small scales is compared with data from high-resolution direct numerical simulations. We show that the compensated spectra (which illustrate the bottleneck effect) and dissipation spectra are encapsulated excellently, in accordance with our proposal.
ISSN: 10706631
Rights: © 2015 AIP Publishing LLC
Appears in Collections:Άρθρα/Articles

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