The topology of skin friction and surface vorticity fields in wall-bounded flows
MS Chong, JP Monty, C Chin, I Marusic
JOURNAL OF TURBULENCE | TAYLOR & FRANCIS LTD | Published : 2012
In previous studies, the three invariants (P, Q and R) of the velocity gradient tensor have been widely used to investigate turbulent flow structures. For incompressible flows, the first invariant P is zero and the topology of turbulent flow structures can be investigated in terms of the second and third invariants, Q and R, respectively. However, all these three invariants are zero at a no-slip wall and can no longer be used to identify and study structures at the surface in any wall-bounded flow. An alternative scheme is presented here for the classification of critical points at a no-slip wall; the skin friction vector field at the wall is given by the wall normal gradients of the streamw..View full abstract
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Awarded by ARC
The authors would like to acknowledge the use of data from computations of wall bounded flows, especially the data from torroja.dmt.upm.es (described in ). This work is funded by ARC Grant DP1093585.