The effects of different filtering strategies on the statistical properties of the resolved-to-subfilter scale (SFS) energy transfer are analysed in forced homogeneous and isotropic turbulence. We carry out a-priori analyses of the statistical characteristics of SFS energy transfer by filtering data obtained from direct numerical simulations with up to 2048(3) grid points as a function of the filter cutoff scale. In order to quantify the dependence of extreme events and anomalous scaling on the filter, we compare a sharp Fourier Galerkin projector, a Gaussian filter and a novel class of Galerkin projectors with non-sharp spectral filter profiles. Of interest is the importance of Galilean invariance and we confirm that local SFS energy transfer displays intermittency scaling in both skewness and flatness as a function of the cutoff scale. Furthermore, we quantify the robustness of scaling as a function of the filtering type.

Buzzicotti, M., Linkmann, M., Aluie, H., Biferale, L., Brasseur, J., Meneveau, C. (2018). Effect of filter type on the statistics of energy transfer between resolved and subfilter scales from a-priori analysis of direct numerical simulations of isotropic turbulence. JOURNAL OF TURBULENCE, 19(2), 167-197 [10.1080/14685248.2017.1417597].

Effect of filter type on the statistics of energy transfer between resolved and subfilter scales from a-priori analysis of direct numerical simulations of isotropic turbulence

Biferale L.;
2018-01-01

Abstract

The effects of different filtering strategies on the statistical properties of the resolved-to-subfilter scale (SFS) energy transfer are analysed in forced homogeneous and isotropic turbulence. We carry out a-priori analyses of the statistical characteristics of SFS energy transfer by filtering data obtained from direct numerical simulations with up to 2048(3) grid points as a function of the filter cutoff scale. In order to quantify the dependence of extreme events and anomalous scaling on the filter, we compare a sharp Fourier Galerkin projector, a Gaussian filter and a novel class of Galerkin projectors with non-sharp spectral filter profiles. Of interest is the importance of Galilean invariance and we confirm that local SFS energy transfer displays intermittency scaling in both skewness and flatness as a function of the cutoff scale. Furthermore, we quantify the robustness of scaling as a function of the filtering type.
2018
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore FIS/02 - FISICA TEORICA, MODELLI E METODI MATEMATICI
English
Con Impact Factor ISI
Isotropic turbulence; large eddy simulation; Physics - Fluid Dynamics; Physics - Fluid Dynamics
http://arxiv.org/abs/1706.03219v3
Buzzicotti, M., Linkmann, M., Aluie, H., Biferale, L., Brasseur, J., Meneveau, C. (2018). Effect of filter type on the statistics of energy transfer between resolved and subfilter scales from a-priori analysis of direct numerical simulations of isotropic turbulence. JOURNAL OF TURBULENCE, 19(2), 167-197 [10.1080/14685248.2017.1417597].
Buzzicotti, M; Linkmann, M; Aluie, H; Biferale, L; Brasseur, J; Meneveau, C
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/230251
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