This dataset is of the top layer of a Direct Numerical Simulation (DNS) generated at Karlsruhe Institute of Technology, Karlsruhe Germany See - Pinelli et al. (2022) https://doi.org/10.1017/jfm.2021.1080

A second dataset was generated from the top DNS scaler field by cross-correlating the scaler fields in series. The method of cross-correlation is called Feature image velocimetry See - Metoyer et al. (2020) https://doi.org/10.1175/JTECH-D-19-0183.1

GRL_DataOCF12000\data

Contains a few figures of the DNS surface layer, DNS coordinates "ocf12000_xyz" (used in scripts), and the Feature Image Velocimetry (FIV) dataset "imagedata_w60"

imagedata_w60 - a .mat file that contains:

-imagedata: a set of all 180 73x73 FIV velocity fields where imagedata{:,1} are the U (longitudinal) velocities fields imagedata{:,2} are the V (transverse) velocities fields

Note - this set contains the filtered FIV velocities
-imagedatainterpol: A set of all FIV velocities that interpolated
-imagedataraw: The raw unfiltered FIV velocities

-s: FIV settings table (window size and step size)

-T: image vector containing each image number i.e.: "ocf12000_st_1500.tif", "ocf12000_st_1525.tif", ..., etc.

G09_last60 - a .mat file that contains in the structure S:

-Re: Reynolds number for flow

-note: "G09 Flow statistics (non-dimensional) of last 60 time-units"

-z: verticle diminention

-zs: verticle distance from surface

-urms: verticle profile of U_rms (longitudinal)

-vrms: verticle profile of V_rms (horizontal)

-wrms: verticle profile of W_rms (verticle)

-eps: verticle profile of epsolon (the turbulent kinetic energy dissipation rate)

GRL_DataOCF12000\images

Contains normalized 8-bit ".tif" images of the DNS scalar field

GRL_DataOCF12000\mat

Contains the DNS dataset in ".mat" files.

ocf12000_st_XXXX - DNS mat file containing velocity and scalar fields that are 1152x1552 each and co-located in space and time

-c1: Scalar field with a Schmidt number of 7

-dwdz: Vertical divergence

-parameter: DNS parameters

- Reynolds number of 12000 and schmidt number 7

-t: time stamp

-u: longitudinal velocity field

-v: transverse velocity field

GRL_DataOCF12000\scripts

Contains useful scripts to view and explore the dataset

EK_spectra.m - matlab function that generates spectra for use in spectra_viewer.m

isotropy_epsilon.m - opens and views the vertical profile of isotropy and epsilon

plot_G09_last60.m - time-space averaged vertical profile of epsilon

readsnaptop_ocf.m - Read DNS snapshot from GRL_DataOCF12000\mat

spectra_viewer.m - calculate and view the spectra from the DNS and FIV measurements