             %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
             %  Author: Bernhard Makiola              %
             %  Ph.D. Thesis: Experimentelle Unter-   %
             %          suchungen zur Stroemung ueber %
             %          die schraege Stufe, 1992      % 
             %  Address:                              %
             %          Institut fuer Hydromechanik   %
             %          Universitaet Karlsruhe        %
             %          Kaiserstr. 12                 %
             %          D-7500 Karlsruhe              %
             %          Germany                       %
             %  Privat: Mausbergweg 60                %
             %          D-6720 Speyer                 %
             %          Tel.: (06232) 40659           %         
             %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%



In this file you get all the important information about the
file handling for the data files, derived from LDA-measurements
behind a backward-facing step flow with inclined step geometries
by B. Makiola, Ph.D. Thesis 1992


sketch of the investigated flow geometry:

                   y/H
                   |
                   |
                   |
==================================================================
Uo = max. inlet    |
     velocity      |
--> flow direction |
                   |
h1 = inlet height  |
====================\
                   |  \
                   |    \
                   |      \
 H = step height   |        \
                   |          \
                   | step       \
                   | angle  alpha \        h2 = height behind the step
================================================================-----> x/H
 negative <------| 0 |-----> positive


File name:

          files with the extension *.dat are data files in which all measured
          results for one step geometry and one Reynolds number are stored.


File-name-structure:

           example:             m15-all.dat

           The first letter "m" indicates the investigated step angle  and
           the expansion ratio ER according to the following table 1.

           The number "15" indicates the Reynolds number divided by 1000

           "all" indicates that the whole data set is complete


Table 1:
=====================================
|alpha |  ER=1,48 | ER=2,0 |ER=3,27 |
=====================================
| 90   |   M      |  O     |  Y     |
|-----------------------------------|
| 45   |   N      |  B     |  --    |
|-----------------------------------|
| 30   |   H      |  P     |  --    |
|-----------------------------------|
| 25   |   J      |  L     |  F     |
|-----------------------------------|
| 20   |   I      |  U     |  X     |
|-----------------------------------|
| 15   |   G      |  V     |  Z     |
|-----------------------------------|
| 10   |   K      |  R     |  --    |
=====================================


Streamwise velocity data for the following ("x") flow conditions
are available:

Table 2:
============================================================================
| Expansion |angle  |        Reynolds number (based on Uo and h1)          |
| ratio ER  |alpha  |  5000 | 8000 | 11000 | 15000 | 33000 | 47000 | 64000 |
============================================================================
|       (M )| 90    |  x    | x    | x     | x     | -     | x     | x     |
|       (N )| 45    |  x    | -    | -     | x     | -     | x     | -     |
|       (H )| 30    |  x    | x    | x     | x     | -     | x     | -     |
| 1.48  (J )| 25    |  x    | x    | x     | x     | -     | x     | x     |
|       (I )| 20    |  x    | x    | x     | x     | -     | x     | x     |
|       (G )| 15    |  x    | x    | x     | x     | -     | x     | x     |
|       (K )| 10    |  x    | x    | x     | x     | -     | x     | x     |
============================================================================
|       (O )| 90    |  -    | -    | -     | x     | x     | x     | x     |
|       (B )| 45    |  -    | -    | -     | x     | x     | x     | x     |
|       (P )| 30    |  -    | -    | -     | x     | x     | x     | -     |
| 2.00  (L )| 25    |  -    | -    | -     | x     | -     | x     | x     |
|       (U )| 20    |  -    | -    | -     | x     | -     | x     | x     |
|       (V )| 15    |  -    | -    | -     | x     | -     | x     | x     |
|       (R )| 10    |  -    | -    | -     | x     | -     | x     | x     |
===========================================================================|
|       (Y )| 90    |  x    | x    | x     | x     | -     | -     | -     |
| 3.27  (F )| 25    |  x    | x    | x     | x     | -     | -     | -     |
|       (X )| 20    |  x    | x    | x     | x     | -     | -     | -     |
|       (Z )| 15    |  x    | x    | x     | x     | -     | -     | -     |
===========================================================================|


Data-file-structure:

All data files ***.dat have a header, in which all important  information
is stored. In the following example the header and the data-structure 
are explained.


 m15-all.dat      = Filename    <--- file name
 15000.           = Reynolds-number <--- Reynolds number based on max.
                                  inlet velocity and inlet channel height
  1.48            = Expansion ratio  ER  <--- expansion ratio ER = h2/h1
 12.00            = Step height [mm]   <--- step height H in mm
 90.00            = Step angle   <--- step angle alpha in degrees
  8.69            = Uo [x/H=-2] Reference velocity  <-- max. inlet velocity  
                                  2 step heights before the step edge in m/s
  6.35            = reattachment length  <--- measured reattachment 
                                       length, normalized with step height H
  x/H    y/H     U/Uo   rms/Uo  psinorm   <--- column  indicator
 ----------------------------------------------------------------------------
 -2.00   1.000    .000    .000   .0000
 -2.00   1.042    .339    .136   .0041
 -2.00   1.083    .595    .139   .0154
 -2.00   1.167    .738    .113   .0476
 -2.00   1.292    .837    .094   .1046
 -2.00   1.417    .877    .087   .1668
 -2.00   1.625    .934    .077   .2762
 -2.00   1.833    .972    .056   .3914
 -2.00   2.042   1.000    .053   .5105
 -2.00   2.250    .978    .040   .6300
 -2.00   2.458    .918    .061   .7446
 -2.00   2.667    .846    .081   .8512
 -2.00   2.792    .795    .081   .9106
 -2.00   2.917    .716    .096   .9654
 -2.00   3.083    .000    .000  1.0000
   .00   1.000    .000    .000   .0000
   .00   1.042    .185    .139   .0022
   .00   1.083    .588    .142   .0116
   .00   1.167    .739    .100   .0439
   .00   1.292    .807    .084   .1002
   .00   1.417    .871    .086   .1614
   .00   1.625    .931    .070   .2708
   .00   1.833    .978    .058   .3868
...

1. column (x/H): streamwise channel coordinate, normalized with step height

2. column (y/H): cross channel coordinate, normalized with step height

3. column (U/Uo): mean streamwise velocity (U), normalized with the max.
                  inlet velocity (Uo)

4. column (rms/Uo): rms-velocity (u'), normalized with the max. inlet
                    velocity (Uo)

5. column (psinorm): calculated values for the normalized stream function
 
