READ ME File For 'Dataset supporting the publication "The impact of pressure gradient history on flow structures in high Reynolds number rough wall turbulence" (DOI:) '. Dataset DOI:  doi.org/10.5258/SOTON/D3530 Date that the file was created: 05/25 ------------------- GENERAL INFORMATION ------------------- ReadMe Author: Thomas Preskett, University of Southampton Date of data collection: 09/22-01/23 -------------------------- SHARING/ACCESS INFORMATION -------------------------- Licenses/restrictions placed on the data, or limitations of reuse: CC-BY Recommended citation for the data: Please use the above DOI and paper citation This dataset supports the publication: AUTHORS: T. Preskett, and B. Ganapathisubramani TITLE: The Impact of Pressure Gradient History on Flow Structures in High Reynolds Number Rough Wall Turbulence JOURNAL: International Journal of Heat and Fluid Flow PAPER DOI IF KNOWN: doi.org/10.1016/j.ijheatfluidflow.2025.109942 Links to other publicly accessible locations of the data: Links/relationships to ancillary or related data sets: -------------------- DATA & FILE OVERVIEW RW is used for rough wall data and SW for smooth wall data. The h value is the height of the quarter chord above the floor as shown in figure 1. The filenames contain both the surface, velocity, angle of attack and the height above the floor. This dataset contains the following folders and files: Mean_Pressure_Data – Contains both the mean Cp and dCp/d(x/c), along with the position of each tap relative to the leading edge of the aerofoil at 6.53m. PIV_Mean_Flow – File for each angle of attack, separate sheets for x, y, U, V, uu, vv and uv matrices labelled in the sheet name. Also contained within this folder is the comparison of HWA and PIV data for Figure A.13. PIV_Parameter_Summary – Steamwise evolution of U99, delta, deltastar, theta, utau, Pi, beta, nu, rho and the value of U∞ at x/c = -1 Uv_quadrant_analysis - Uv_quadrant_analysis.xlsx contains a sheet for each angle of attack along with the q2 and q4 contribution to the overall shear stress at y/delta = 0.2 and y/delta = 0.6. uv_matched_conditions.xlsx contains y/delta and q2 and q4 contributions for each case shown in Figure 8, each sheet is a single case. Correlation_Structures – Example_Correlation_Feild.xlsx contains the example correlation field for the -8˚ at xref/c = 0.25. Flow_structure_variation_0.2_delta.xlsx contains the variation in contours parameters a/delta, b/delta and theta along with corresponding streamwise position, each sheet is for a given angle of attack and a given contour level. Flow_structure_variation_m8_ydelta.xlsx contains the variation in contours parameters a/delta, b/delta and theta along with corresponding streamwise position, each sheet is named with the height at which the reference position is taken. Flow_structure_contours.xlsx contains the contours from figure 12, the sheets are named with angle of attack, x/c position and y/delta position of reference point. Datasets for each figure within the paper described above: Fig 2: • All angles of attack from dCp/d(x/c) in Mean_Pressure_Data Fig 3: • U field for all angles of attack from PIV_Mean_Flow with boundary layer thickness from PIV_Parameter_Summary Fig 4a: • Variation of beta given in PIV_Parameter_Summary along with corresponding x/c position Fig 4b: • Variation of Pi given in PIV_Parameter_Summary along with corresponding x/c position Fig 5a and 5b: • ΔΠ can be calculated using Variation of Pi given in PIV_Parameter_Summary and Δβ can be calculated using dCp/d(x/c) along with the inlet conditions to find dP/dx. Any pressure gradient upstream of x/c = -1 is assumed to be zero. Fig 6: • UV profiles are given in the uv field PIV_Mean_Flow from which the corresponding position can be exported. The corresponding Utau and delta can be found in PIV_Parameter_Summary. Fig 7: • The variation in the contribution of Q2 and Q4 events are given in uv_quadrant_analysis for each angle of attack. Data is given for both y/delta = 0.2 and y/delta = 0.6 and can be distinguished from the header of the columns. Fig 8: • The contribution of Q2 and Q4 to the overall shear stress for the cases at matched conditions are given in uv_matched_conditions.xlxs. Each sheet has a name which gives the angle of attack and the position at which the profile is taken from. Fig 9: • The example correlation field for -8˚ with reference at x/c = 0.25 and y/delta = 0.2 given in Example_Correlation_Feild.xlsx containing x/delta, y/delta and Ruu Fig 10: • Variation in contour parameter from ellipse fitting given in Flow_structure_variation_0.2_delta.xlsx. Each sheet has the angle of attack along with the contour level (0.2 and 0.6). Each column is named based on the variable which is given (a/delta, b/delta and theta). Fig 11: • Variation in contour parameter from ellipse fitting given in Flow_structure_variation_m8_ydelta.xlsx for the -8˚ case. Each sheet is named based on the position at which the yref/delta is taken at. Each column is named based on the variable which is given (a/delta, b/delta and theta). Fig 12: • Contours at matched conditions given in Flow_structure_contours.xlsx each case is denoted by the sheet name which contains the angle of attack, the position of the reference point in both x/c and y/delta to distinguish between contours. For each contour the x and y coordinates are given normalised by delta. Fig A.13: • HWA and PIV data normalised in outer units contained within HWA_PIV_Comparison.xlsx. Each sheet is label with the AOA and the data acquisition type.