This readme file is for the experimental dataset associated with the publication "Turbulent dispersion of a passive scalar in a
smooth-wall turbulent boundary layer."

Published in Journal of Fluid Mechanics 969 https://doi.org/10.1017/jfm.2023.562

File names with P1, P2, P3, describe the location of the field-of-view. Cs1, Cs50, etc, describe the source concentration (mg/L). See figure 1 and table 1 of the manuscript.

Files ending with _CfluxMEAN can be loaded into matlab as ACM struct. It contains the time-averaged (i.e. mean) PIV and PLIF data and has the following fields:
x coordinate (streamwise): X
y coordinate (wall-norm) : Y
Mean streamwise velocity : U
Mean vertical velocity   : V
Mean concentration	 : C
Mean advective flux in x : CU
Mean advective flux in y : CV
Mean turb flux in x      : cpup
Mean turb flux in y    	 : cpvp
Mean u'u' (variance) 	 : upup
Mean u'v'		 : upvp
Mean v'v'		 : vpvp
Mean c'c' (C variance)	 : cpcp
Peak C values		 : Cpeak

Files ending with Cflux_xx where xx=17, 18, 19, are instantaneous PIV and PLIF results that can be loaded into matlab as ACMi struct. It contains instantaneous PLIF data that can be used to plot figure 4a-c and has the following fields:
x coordinate (streamwise): X
y coordinate (wall-norm) : Y
Concentration		 : C
Streamwise velocity 	 : U
Vertical velocity   	 : V

File Dij contains turbulent diffusivity maps (figure 16 of the manuscript). 

Files P2_cpTransport and P3_cpTransport contain information on the concentration fluctuations budget (equation 4.7 and figure 9). Terms I, II, III and V are consistent with the manuscript, which describe advection, production, turbulent diffusion and dissipation respectively.

File PDF_C_cprms is the dataset for figure 11. It contains a 2000 x 25 matrix, where the parameter C/c'_rms is sampled at 25 spatial locations (column) for 2000 PLIF images (row). The 25 sampled locations are at x/BL=[1:5] and y/BL=[0.03, 0.05, 0.1, 0.2, 0.4], where BL is the boundary layer thickness. Column 1 represents data at x/BL=1 and y/BL=0.03, column 2 at x/BL=1 and y/BL=0.05, ..., column 6 at x/BL=2 and y/BL=0.03, ..., column 25 at x/BL=5 and y/BL=0.4, so on and so forth.

File C99_cprms contains the C99/c'rms data plotted on figure 11. It is a 5x5 matrix at the same 25 spatial locations as described earlier for file PDF_C_cprms. Row 1 represents y/BL=0.4, row 5 represents y/BL=0.03, column 1 represents x/BL=1, column 5 represents x/BL=5. Note that by row 1 and column 1, we are referring to the first element of the matrix (Matlab's default coordinate system).