TBL20:  Closed Separation Bubble

References:
 Alving, A. E. & Fernholz, H. H. 1996 Turbulence measurements around 
a mild separation bubble and downstream of reattachment.
 J. Fluid Mech. 322, pp 297-328.

 Alving, A. E. & Fernholz, H. H. 1995 Mean-velocity scaling in and
 around  a mild, turbulent separation bubble.
  Phys. Fluids 7, pp 1956-1969.

Turbulent boundary layer on a smooth, axisymmetric body exposed to an
 adverse pressure gradient of sufficient strength to cause a short 
region of mean reverse flow (`separation'). The pressure distribution 
is tailored such that the boundary layer reattaches and then develops 
in a nominally zero pressure gradient.


 The test surface was a hollow aluminium circular cylinder, 1.65m in
 length and 0.25m in diameter, its axis aligned with the flow and 
preceded by a 0.3m elliptical nosecone. The boundary layer was 
tripped at the nosecone/cylinder junction.
The test surface was surrounded by a concentric, perforated cylinder 
forming the outer wall (diameter 0.61m) and ended at a perforated end 
plate. This outer wall was shaped to produce an adverse pressure 
gradient at the start of the test cylinder.

Data is in 24 files whose names indicate the streamwise position 
(e.g. 0175 = 175mm from the trip location ) at which the measurements
 were made and whether they were obtained using single hot wires 
(prefix mn) or X wires (prefix uvw).
All files are in  ASCII ( *.dat ) format.

Nomenclature is conventional apart from:
us   The Perry-Schofield velocity scale.
B    The Perry-Schofield length.scale
Upot   The potential velocity.
Cfpw   Skin friction coefficient from wall mounted pulsed wire.
Chi   The probability of reverse flow.