Characteristics of vortex packets in turbulent boundary layers

By Bharathram Ganapathisubramani, Ellen Longmire, Ivan Marusic. Journal of Fluid Mechanics, 2003

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Subfields: Computational Mechanics, Environmental Engineering, Global and Planetary Change

View Paper: https://www.semanticscholar.org/paper/0c08f88f942b5402433debbb303c7a1784f89ff7

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Citations in the corpus

Observations of turbulent secondary flows in a rough-wall boundary layer (2014, background): “These ‘superstructures’ can meander significantly in the spanwise direction (Hutchins & Marusic 2007), embody a significant fraction of the turbulent kinetic energy (TKE) and Reynolds shear stress (RSS) (Ganapathisubramani et al. 2003; Natrajan & Christensen 2006) and amplitude-modulate the smaller-”
Investigation of large-scale coherence in a turbulent boundary layer using two-point correlations (2005, methodology): “Furthermore, the feature-detection algorithm mentioned earlier (Ganapathisubramani et al. 2003) did not identify any long packets when applied at z/δ = 0.”
Large-scale amplitude modulation of the small-scale structures in turbulent boundary layers (2009, background): “PIV studies of streamwise/spanwise planes have revealed the presence of a pronounced stripiness in instantaneous ﬁelds of streamwise velocity ( u ) ﬂuctuation (Ganapathisubramani, Longmire & Marusic 2003; Tomkins & Adrian 2003; Hutchins & Marusic 2005; Hambleton, Hutchins & Marusic 2006).”
Population trends of spanwise vortices in wall turbulence (2006, background): “Adrian & Hanratty (2001) and Ganapathisubramani, Longmire & Marusic (2003) underscore the important role these large-scale motions play in log-layer transport processes.”
Spatial structure of a turbulent boundary layer with irregular surface roughness (2010, background): “Both of these events have spanwise widths of 0.2δ–0.3δ and are quite consistent with previous observations of such regions in the log layer of smooth-wall turbulence (see e.g. Ganapathisubramani et al. 2003; Tomkins & Adrian 2003; Ganapathisubramani et al. 2005).”
Large-scale motions in a supersonic turbulent boundary layer (2006, background): “The patterns observed in figure 2 seem to be more consistent with the velocity fields from instantaneous PIV measurements made in incompressible boundary layers by Ganapathisubramani et al. (2003) and Tomkins & Adrian (2003).”
Effects of micro-ramps on a shock wave/turbulent boundary layer interaction (2009, result): “PIV data of the boundary layer without interaction showed that these streaks are at least as long as their fields-of-view.”
Very-large-scale motions in a turbulent boundary layer (2010, methodology): “Finally, Ganapathisubramani et al. (2003) demonstrated the significance of packet motions quantitatively: 25 % of the Reynolds shear stress is associated with hairpin vortices that occupy less than 4.5 % of the total area.”
Large-scale features in turbulent pipe and channel flows (2007, background): “Since very long coherent structures are now known to populate the log region of boundary layers (see HM07 or Ganapathisubramani et al. 2003), it is logical to suggest that a more logarithmic mean velocity implies extended streamwise coherence of structures further from the wall.”
Three-dimensional instantaneous structure of a shock wave/turbulent boundary layer interaction (2009, result): “These results thereby support the hairpin packet model reported by Kim & Adrian (1999), Adrian et al. (2000), Tomkins & Adrian (2003) and Ganapathisubramani et al. (2003) among many others, which explains the existence of the streamwise-elongated regions of uniform velocity extending to distances…”
Towards Reconciling the Large-Scale Structure of Turbulent Boundary Layers in the Atmosphere and Laboratory (2012, methodology): “In the laboratory, hairpin vortices have been well-documented (for example Adrian et al. 2000b; Christensen and Adrian 2001; Ganapathisubramani et al. 2003, 2005; Lee and Sung 2011) while in the ASL the evidence, though suggestive of such features, has been less conclusive (Hommema and Adrian 2003;…”
Turbulence structure in a boundary layer with two-dimensional roughness (2009, methodology): “Prograde swirl (B = λp), as used by Hambleton et al. (2006) and Christensen & Adrian (2001), was useful for identifying the velocity field associated with a hairpin vortex head at the reference location.”