This is the README file for the dataset for the 25% scale DrivAer model, collated by Max Varney (https://www.linkedin.com/in/max-varney/) on 2020/04/07. More information can be found in the PUBLICATION NAME AND LINK.

Data was collected in the Large Wind Tunnel at Loughborough University, a 2.5m^2, closed working section, fixed ground open return tunnel. Details of the tunnel can be found in: https://repository.lboro.ac.uk/articles/journal_contribution/Design_methodology_and_performance_of_an_indraft_wind_tunnel/9224171

The CAD geometry for the mounting hardware and the wind tunnel are all included in the dataset as ASCII .stl files, with the units in m. The CAD geometry of the DrivAer model has not been duplicated for this dataset, instead the full scale model can be found at: https://www.mw.tum.de/en/aer/research-groups/automotive/drivaer/

Photos of the set up and some unique model dimensions are also included. The model was supplied by FKFS and is a 25% scale DrivAer model with three backs, the estate, fast and notchback variants. The model included the 5 spoke wheels, complex underbody, wing mirrors, the drivetrain, an open front grill and a porous radiator. As the model is not symmetric, in the engine bay and on the underside, it was set at a geometric 0 yaw condition as measured in the wind tunnel. This is estimated to be +/-0.1 degrees.

No corrections (for example blockage) have been applied to the data. All the data is presented in SI units and all measurements are from the origin (mid-track, mid-wheelbase on the tunnel floor) with x positive downstream and z positive up, using the right hand rule to find positive y.

The data is split into '_Mean' and '_Instantaneous' for each measurement type (Force, Pressure, Flow Field). All the data was taken during the same test session with a total sample time of 300 seconds typically and 100 seconds for the measurements in the stagnation region. The different data sets are not correlated with each other in time. The Force data was sampled at 300Hz, Pressure data at 260Hz and the Flow Field data at 5Hz. The data presented in the '_Mean' folders is the arithmetic mean of that presented in the '_Instantaneous' folders.
	
All the '_Mean' folders contain Comma Separated Variable (csv) files, for ease of parsing with your desired programming language, and the same data is provided in a .dat file that is set up to be read into TecPlot. The csv format was used to reduce size and complexity for the '_Instantaneous' data. Example MATLAB code has been provided (tested in 2018a) that reads both the '_Mean' and '_Instantaneous' csv files for the pressure and flow field measurements, plotting them accordingly.

The 'Force_Mean' folder contains 3 .csv files, one for each configuration (fast/estate/notch) with the mean values for the force data taken at each flow field plane. The folder also contains a .dat file for each plane and configuration. Both file types include the velocity, ambient temperature, ambient pressure, calculated air density, yaw angle, the 3 force and 3 moments (taken about mid-wheelbase mid-track and on the tunnel floor), the model frontal area, model wheelbase, the calculated force and moment coefficients.

The 'Force_Instantaneous' folder contains a .csv file for each configuration and each flow field measurement with the same variables as the mean folder apart from the coefficients. Each row is an instance in time.

The 'Pressure_Mean' folder contains two sets of .csv files. '_Tapping_Map', presents the x, y and z positions of the pressure tappings, the group that they belong to (1 - Roof, 2/3 - Side Glass, 4 - Base) and the associated pressure tapping number. '_Averages', contains the mean, '_MeanCp', and RMS of the deviation, '_RMSCp', for each flow field plane. The flow field planes and the mean/RMS are defined in the Data_Description column. The additional columns in this file are for the individual pressure tappings.

The 'Pressure_Instantaneous' folder contains a .csv file for each configuration and each flow field measurement. It also contains the same '_Tapping_Map' csv files provide with the mean pressures to prevent the need to download both datasets. In this instance each column is a pressure tapping location and each row in a time instance. 

The 'FlowField_Mean' folder contains a .csv file for each configuration and plane. Each .csv file includes the x, y and z coordinate of every vector, the mean and rms of the u and w components and the velocity magnitude. Invalid vectors are marked in the dataset with a value of -9999  at the XYZ location (Invalid vectors arise in experimental data due to seeding, image quality or processing problems). The FlowField_Example_Code hides the invalid vectors during plotting.

The 'FlowField_Instantaneous' folder contains the same file structure as 'FlowField_Mean' but with the columns representing time steps, indicated by the column header. A simple way to read this is demonstrated in FlowField_Example_Code.