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README: Experimental Database for Wall-mounted Spoiler Validation Study
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Journal Paper: 
Numerical Simulation of the Aerodynamics and Acoustics of a Wall-Mounted Spoiler
Authors: Owen Parnis & David Angland
DOI:  10.2514/1.J064906

Dataset Title: Dataset in support of the paper 'Numerical simulation and validation of the aerodynamics and acoustics of a wall-mounted spoiler'
Dataset DOI: https://doi.org/10.5258/SOTON/D3189

Licence: CC-BY

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Database Overview
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This archive contains the experimental dataset for validating the numerical simulations performed using ProLB for a wall-mounted flat plate spoiler deflected at 30°. The experimental campaign includes acoustic measurements, surface pressure distributions, hotwire anemometry, and particle image velocimetry (PIV).
Data is organised in the following folders:


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Folder Structure
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1. Acoustics
	- Description: Narrowband far-field acoustic data acquired from the overhead microphones defined in Table A1.
	- Files:
		- corrected_noise_spectra_WallMountedSpoiler_30deg.dat
	- Format: ASCII .dat files (description in file)
	- Sampling Rate: 25.6 kHz

2. Boundary Layer Velocity Profiles
	- Description: Boundary layer velocity profiles at two streamwise locations upstream of the spoiler: (a) x = -0.47 m (x^* = -4.4)  and (a) x = -0.33 m (x^* = -3). Locations are based on the coordinate system defined in Fig.1. 
	- Files:
		- BL_30deg_-0.47m.dat : Velocity Profile at x = -0.47 m away from the leading edge of the spoiler. (In the numerical simulation, this refers to 30xle i.e. x = 0.18 mm from the nozzle)
		- BL_30deg_-0.33m.dat : Velocity Profile at x = -0.33 m away from the leading edge of the spoiler. (In the numerical simulation, this refers to 30xle i.e. x = 0.32 mm from the nozzle)
	- Format: ASCII .dat files (columns: z(mm), U(m/s))

3. Hotwire (Contours)
	- Description: Contours of the mean velocity and the turbulent intensity of the effective cooling velocity. Measurements were done at two planes, HW_1 = 0.159 m and HW_2 = 0.212 m, based on the coordinate axis defined in Fig.1. The acquisition map is provided in Fig. 2.
	- Files:
		- ContourPlots_HW_x1.5.dat - Data for the mean effective velocity and turbulent intensity at a plane x* = 1.5 downstream of the spoiler's leading edge.
		- ContourPlots_HW_x2.0.dat - Data for the mean effective velocity and turbulent intensity at a plane x* = 2 downstream of the spoiler's leading edge.
	- Format: ASCI .dat file (coloumns y*(), z*(), Ueff(m/s), TI)

4. Hotwire (Single Point Turbulence) 
	- Description: Single-probe measurement of turbulence PSD spectra calculated on the fluctuating component of the instantaneous effective cooling velocity (u'_eff). Measurements were done at two streamwise planes, HW_1 = 0.159 m and HW_2 = 0.212 m, based on the coordinate axis defined in Fig.1. Point measurements were done at two locations: P1 along the shear layer, P2 along the side edge of the spoiler. Refer to Table A3 for the spatial location of the probe.
	- Files:
		- HW_HW1_P1.txt - x = 0.159 m, y = 0 m, z = 0.087 m (HW_1, P1 -> Along the shear layer)
		- HW_HW1_P2.txt - x = 0.159 m, y = -0.125 m, z = 0.054 m (HW_1, P2 -> Along the side of the spoiler)
		- HW_HW2_P1.txt - x = 0.212 m, y = 0 m, z = 0.087 m (HW_2, P1 -> Along the shear layer)
		- HW_HW2_P2.txt - x = 0.212 m, y = -0.125 m, z = 0.054 m (HW_2, P2 -> Along the side of the spoiler)
	- Format: TXT (columns: f(Hz), u'_eff^2(m^2/s^2))

5. On_Surface_Pressure
	- Description: Mean on-surface pressure along the model's symmetry plane (y = 0 m). Coordinate axes are defined as shown in Fig.1. Refer to Table A2 for the location of the pressure taps on the model.
	- Files:
		- MeanOnSurfacePressure_y0_MountingBasePlate: C_p distribution along the base mounting plate.
		- MeanOnSurfacePressure_y0_SpoilerUpstreamFace: C_p distribution along the upstream face of the wall-mounted spoiler plate.
		- MeanOnSurfacePressure_y0_SpoilerUpstreamFace: C_p distribution along the downstream face of the wall-mounted spoiler plate.
	-Format: TXT (columns: x(m), C_p)

6. PIV Data
	- Description: 2D PIV data along the symmetry plane of the spoiler. 
	- Files: 
		- WallMountedSpoiler_30deg_PIV_DataSet.dat
	-Format: TECPLOT .dat (UMag(m/s), 2DTKE(m^2/s^2), Vorticity_y(1/s), x(m), z(m))



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Additional Notes
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- The results were acquired at a freestream velocity of 60 m/s.
- For further details on the test facility and measurement setup, refer to the "Experimental Methodology" section and Appendix A in the published journal paper.


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CONTACT
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For questions, please contact:  
Owen Parnis  
Email: o.parnis@soton.ac.uk  
Affiliation: University of Southampton

Copyright © 2025 by Parnis and Angland.