Flow topology and non-local geometry of structures in a flat-plate turbulent boundary layer
نویسندگان
چکیده
The flow structure of a DNS of a flat-plate turbulent boundary layer (Wu & Moin 2010) is studied by combining the topological techniques developed by Chong et al. (1990) and Ooi et al. (1999) with the multiscale non-local geometric analysis of Bermejo-Moreno & Pullin (2008), extending the latter to include physical parameters in the analysis and relating them to the geometry of the educed structures. The suitability of two local identification criteria used for the eduction of vortex tubes and sheets in turbulent flows is also evaluated for this flow type. Results are compared to isotropic turbulence. The time evolution of a hairpin vortex is analyzed by a series of snapshots available from the numerical database, integrating physical quantities with its geometrical characterization.
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