ISSN:
1089-7666
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Based on Taylor series expansions for the filtered velocity field, we present an analytical study of the "Germano identity" used in the dynamic sub-grid scale (SGS) model for large eddy simulation (LES). We consider the case of explicit filtering defined in physical space and show that the choice of the length scale which characterizes the test SGS tensor Tij is a main issue in modeling the "Germano identity." In the field of eddy-viscosity models, we demonstrate the accuracy of a Gaussian formulation lfg2=lf2+lg2, based on a priori tests of fully developed pipe flow. More than a generalization of formal results [B. Vreman, B. Geurts, and H. Kuerten, J. Fluid Mech. 339, 357 (1997)], our study reveals constraints and limitations of the dynamic approach. © 2001 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1378037
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