                    README.DOCumentation file

Data for cube at Re 80000
DATA AQUIRED FOR THE DOCTORAL THESIS (1992) 


Data in the files is normalized according to:

    x ---  U direction    (main flow direction)   x=0 leading cube edge

    y ---  V direction    (height)                y=0 channel floor (foot of cube)

    z ---- W direction    (span or width)         z=0 middle or symmetry plane ( middle of cube )

    H = cube height (25.0mm)    Ub = bulk velocity
    h = channel height = 2H = 50.0mm

    x,y,z  ===>  x/H, y/H, z/H

    U, V, W =====>   U/Ub, V/Ub,  W/Ub

    Reynolds stresses are normalized by Ub^2


Third order velocity correlation coefficients:

            ____            ____            ____            ____
     u3  =  u^3       u2v = u^2v     uv2 =  uv^2       v3 = v^3
           -----           -----            -----           -----
           u~^3             u~^2v~          u~v~^2          v~^3
            
            ____            ____            ____            ____
     u3  =  u^3       u2w = u^2w     uw2 =  uw^2       w3 = w^3
           -----           -----            -----           -----
           u~^3             u~^2w~          u~w~^2          w~^3
            
Fourth order velocity correlation coefficients:

         ____            ____             ______         ____           ____
  u4  =  u^4       u3v = u^3v     u2v2 =  u^2v^2   uv3 = uv^3      v4 =  v^4 
        ------           ------          -------       -------          -----
        u~^4             u~^3v~          u~2v~^2        u~v~^3          v~4

         ____            ____             ______         ____           ____
  u4  =  u^4       u3w = u^3w     u2w2 =  u^2w^2   uw3 = uw^3      w4 =  w^4 
        ------           ------          -------       -------          -----
        u~^4             u~^3w~          u~2w~^2        u~w~^3          w~4
            
where  u~= sqrt(u^2), v~=sqrt(v^2),  w~=sqrt(w^2), i.e.  rms velocity fluctuations

Data files are contained in 4 directories:
  data_a : files contain mean velocity and Reynolds stresses from u-v measurements
  data_b : files contain third and fourth order moments from u-v measurements
  data_c : files contain mean velocity and Reynolds stresses from u-w measurements
  data_d : files contain third and fourth order moments from u-w measurements

Within each directory, files are named as xnnzmm_l.dat where l denotes the directory (and hence what type of data it aontains), nn denotes the x location, and mm the z location of the profile. The values of nn and mm correspond to x/H and z/H positions as given below.

 x-name(nn)  x-position  z-name(mm) z-position
------------------------------------------------
    01       -18.02	    01      -6.00
    02       -14.10	    02      -1.50
    03       -11.44	    03      -1.00
    04       -10.80	    04      -0.76
    05        -7.00	    05      -0.74
    06        -6.90	    06      -0.54
    07        -5.00	    07      -0.50
    08        -4.00	    08      -0.25
    09        -3.00	    09       0.00
    10        -2.00	    10       0.25
    11        -1.50	    11       0.50
    12        -1.00	    12       1.00
    13        -0.75	    13       1.20
    14        -0.50	    14       1.60
    15        -0.44	    15       3.20
    16        -0.42	    16       6.00
    17        -0.33	
    18        -0.32	
    19        -0.25	
    20        -0.02	
    21         0.00	
    22         0.25	
    23         0.50	
    24         0.75	
    25         1.00	
    26         1.08	
    27         1.25	
    28         1.33	
    29         1.50	
    30         1.56	
    31         2.00	
    32         2.33	
    33         2.41	
    34         2.50			      
    35         3.00			      
    36         4.00			      
    37         6.00			      
    38         8.00			      

For example, x18z12_a.dat contains u-v measurement data of mean velocities and Reynolds stresses at x/H=-0.32, z/H=1.0. The locations are also given in the header lines of each file.
