
This directory contains experimental 2D-PIV mean data for CFDVAL Case 3.
The 2D-PIV data were taken along the tunnel center-plane.  The data are
given in 4 regions of the flowfield.  The forward-most points include data
just upstream of the slot.

piv_noflow_1all.dat  = No-flow-control data: from roughly 0.63 < x/c < 0.73
piv_suck_1all.dat    = Suction data:         from roughly 0.63 < x/c < 0.73
piv_noflow_2all.dat  = No-flow-control data: from roughly 0.74 < x/c < 0.96
piv_suck_2all.dat    = Suction data:         from roughly 0.74 < x/c < 0.96
piv_noflow_3all.dat  = No-flow-control data: from roughly 0.95 < x/c < 1.16
piv_suck_3all.dat    = Suction data:         from roughly 0.95 < x/c < 1.16
piv_noflow_4all.dat  = No-flow-control data: from roughly 1.16 < x/c < 1.39
piv_suck_4all.dat    = Suction data:         from roughly 1.16 < x/c < 1.39

The data include x/c, y/c, U, m/s, V, m/s, uu, m^2/s^2, vv, m^2/s^2, and uv, m^2/s^2

***Note for the files piv_noflow_2.dat and piv_suck_2.dat***
These data files include a region at the bottom left
that lies INSIDE of the hump body.  (The coordinates for the
hump body at its back end are given in the file Coords_backend.dat.)
The data in piv_noflow_2.dat and piv_suck_2.dat that lie within 
and near this region should be discounted!

The data are given in an x-y coordinate system, where
x is downstream and y is up.  The x,y data are given in
terms of x/c and y/c, where c = chord = 16.536 inches = 420 mm.
Mean U and V components of velocity are given in m/s.

It should be noted that the turbulence uv data has a maximum
error of as much as 20%, and urms and vrms have a maximum
error of as much as 14%, based on a pseudo-empirical
uncertainty analysis.  Therefore, the turbulence data given
here should not be taken as absolute levels, but rather
should be used to assist in qualitative evaluation of
turbulence models.

The data files are all "Tecplot-format" (Tecplot version 10).  For
example, for:

 I=90, J=50, K=1, ZONETYPE=Ordered
 DATAPACKING=BLOCK

the data should be read from the files (ignoring title, zone,
variables, and other header lines) via:

      idim=90
      jdim=50
      read(2,*) ((x(i,j),i=1,idim),j=1,jdim)
      read(2,*) ((y(i,j),i=1,idim),j=1,jdim)
      read(2,*) ((u(i,j),i=1,idim),j=1,jdim)
      read(2,*) ((v(i,j),i=1,idim),j=1,jdim)
      read(2,*) ((uu(i,j),i=1,idim),j=1,jdim)
      read(2,*) ((vv(i,j),i=1,idim),j=1,jdim)
      read(2,*) ((uv(i,j),i=1,idim),j=1,jdim)

For:
 I=93, J=65, K=1, ZONETYPE=Ordered
 DATAPACKING=BLOCK
it is similar, except idim=93 and jdim=65.
For:
 I=87, J=67, K=1, ZONETYPE=Ordered
 DATAPACKING=BLOCK
it is similar, except idim=87 and jdim=67.
For:
 I=98, J=69, K=1, ZONETYPE=Ordered
 DATAPACKING=BLOCK
it is similar, except idim=98 and jdim=69.

If you have an earlier version of Tecplot (for example, 
version 8 or 9), you can slightly modify the files so 
they can be read by those versions.  For example, change:

 I=90, J=50, K=1, ZONETYPE=Ordered
 DATAPACKING=BLOCK

to:

 I=90, J=50, K=1, F=BLOCK

Note that in some of the data files, there is an area
(in the upper left corner) where the data have been zeroed
out because the data could not be obtained reliably up
to 70 mm in that region.
