Please use this identifier to cite or link to this item:
https://hdl.handle.net/20.500.14279/9389
Title: | Generalized Batchelor functions of isotropic turbulence | Authors: | Gravanis, Elias Akylas, Evangelos |
metadata.dc.contributor.other: | Γραβάνης, Ηλίας Ακύλας, Ευάγγελος |
Major Field of Science: | Engineering and Technology | Field Category: | Civil Engineering;Civil Engineering | Keywords: | Spectroscopy;Autocorrelation functions;Bottleneck effects;Degree of accuracy | Issue Date: | 11-Jan-2015 | Source: | Physics of Fluids Volume 27, Issue 1, January 09, 2015, Article number 1.4905326 | DOI: | 10.1063/1.4905326 | 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. | URI: | https://hdl.handle.net/20.500.14279/9389 | ISSN: | 10706631 | Rights: | © 2015 AIP Publishing LLC | Type: | Article | Affiliation : | Cyprus University of Technology | Publication Type: | Peer Reviewed |
Appears in Collections: | Άρθρα/Articles |
Files in This Item:
File | Description | Size | Format | |
---|---|---|---|---|
Akylas.pdf | 485.04 kB | Adobe PDF | View/Open |
CORE Recommender
Page view(s) 10
533
Last Week
0
0
Last month
4
4
checked on Nov 6, 2024
Download(s) 10
183
checked on Nov 6, 2024
Google ScholarTM
Check
Items in KTISIS are protected by copyright, with all rights reserved, unless otherwise indicated.