READ ME File For 'MATLAB Data for Data-driven determination of low-frequency dipole noise mechanisms in stalled airfoils'

Dataset DOI: 10.5258/SOTON/D2466

ReadMe Author: D. W. Carter, University of Southampton [0000-0001-8675-1849]

This dataset supports the publication:
AUTHORS: D. W. Carter, B. Ganapathisubramani
TITLE: Data-driven determination of low-frequency dipole noise mechanisms in stalled airfoils
JOURNAL: Experiments in Fluids
DOI: 10.1007/s00348-023-03577-z


This dataset contains: MATLAB files with pressure and velocity fields for all experiments presented in the manuscript. In addition, the original MATLAB figure files are included.

The datset storage is as follows: Experimental test cases are stored in folders as SSSS_AA where 'SSSS' is the airfoil shape and 'AA' is the angle of attack. Each case contains five run folders e.g. run 1 is labeled 'R01'. Each run folder contains instantaneous fields stored as 'S*.mat' with u,v, and p corresponding to the streamwise velocity, cross-stream velocity, and pressure fields respectively in sequential order. In addition, a 'stats' folder is included with statistical fields, masks, and x-y coordinates. Two masks are included, one 'mask.mat' corresponding to the airfoil cross section and one 'o_mask.mat' corresponding to the data that is visually occluded at the measurement plane.

The figures are as follows:

Fig. 1   Diagram of the experimental setup and mean velocity fields for the attached case with overlapping fields of views
Fig. 2   Surface pressure coefficients comparison with RANS simulation and their standard deviation on the suction side
Fig. 3   Unit vectors surrounding the airfoil for the deep stall case used to compute acoustic pressure
Fig. 4   Overall sound powerl level and orientation-averaged acoustic spectra
Fig. 5   Contours of TKE for original and noise-correlated fluctuating velocity fields
Fig. 6   Instantaneous acoustic fluctuations highlighting conditional analysis and the conditional POD coefficients for the stalled cases
Fig. 7   Conditional fluctuating velocity fields for the transitional stall case
Fig. 8   Conditional fluctuating velocity fields for the deep stall case


Date of data collection: July, 2020

Licence: CC BY

Date that the file was created: September, 2022