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- W2117515814 abstract "The spatial structure of momentum sources and sinks ( T > 0 and T < 0; where T is the streamwise component of the Lamb vector) is examined in a turbulent boundary layer by using dual-plane particle image velocimetry data obtained in streamwise–spanwise planes at two wall-normal locations ( x 2 /δ = 0.1 and 0.5, where x 2 is the wall-normal location and δ is the boundary layer thickness). Two-point correlations of T indicate that the size of source motions remains relatively constant while the size of sink motions increases with increasing wall-normal distance. The relative strength of sink motions also increases away from the wall. The velocity field in the vicinity of source/sink motions was explored by computing cross-correlations of T with the velocity components. Source-like motions are correlated with elongated low-momentum zones that possess regions of upwash embedded within them and appear to be the strongest in areas where these low-momentum zones meander in the spanwise direction. Momentum sinks appear to be located within low-speed regions that are within larger high-momentum zones. The velocity fluctuations undergo rapid transitions between quadrants in the vicinity of sinks (i.e. both streamwise and wall-normal velocity fluctuations change sign). The length scales, over which the fluctuations change sign, are much larger at x 2 /δ = 0.5 than at x 2 /δ = 0.1." @default.
- W2117515814 created "2016-06-24" @default.
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- W2117515814 date "2008-07-10" @default.
- W2117515814 modified "2023-09-27" @default.
- W2117515814 title "Statistical structure of momentum sources and sinks in the outer region of a turbulent boundary layer" @default.
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- W2117515814 doi "https://doi.org/10.1017/s0022112008001675" @default.
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