Turbulent boundary layer structure identification via POD
نویسنده
چکیده
Proper orthogonal decomposition (POD) is applied to the direct numerical simulation (DNS) of a turbulent boundary layer performed by Wu & Moin (2010), and the resulting POD modes of various scales are examined. The modes include structures resembling those observed in instantaneous flow fields, such as large-scale motions of streamwise velocity with ramp-like wall-normal growth. Other modes correspond closely to nearwall streaks. In addition, POD modes that are constant across the spanwise domain width are observed to grow from the wall with the mean boundary layer thickness. The results support the existence of boundary layer coherent motions described by the hairpin packet model (Adrian 2007).
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