Anisotropy in large eddy simulations determined from SO(3) symmetry group

• Type: Article in International Scientific Journal
• Date: 2005

Authors

Hofbauer, T (Author) Other; Palma, JMLM (Author) FEUP; Biferale, L (Author) Other; Gama, SMA (Author) FCUP

Journal

Title: Journal of Turbulence

Vol. 6

Final page: N9

ISSN: 1468-5248

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-000-65E

DOI: 10.1080/14685240500125435

Abstract (EN): The issue of small-scale anisotropy in the context of eddy-viscosity-type subgrid-scale models is discussed in the present work. Recent developments in turbulence research suggest that anisotropy from large spatial scales is felt far into the inertial subrange of turbulence. This is of particular importance for subgrid-scale models of large eddy simulations. To address this issue, we present solutions of the random-phase Kolmogorov flow at moderate Reynolds numbers using direct numerical simulations and large eddy simulations with four subgrid-scale models: the Smagorinsky, the dynamic, the dynamic Clark, and the tensor-diffusivity models. The degree of anisotropy at different scales is analysed by decomposing the structure function into their irreducible representation of the SO( 3) symmetry group. The results suggest that the dynamic model and the dynamic Clark model reproduce the statistical behaviour reasonably well, even in the anisotropic sectors at small length scales.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11