READ ME File For 'Assessment of aerodynamic roughness parameters of turbulent boundary layers over barnacle-covered surfaces'

Dataset DOI: https://doi.org/10.5258/SOTON/D2782
Date of file creation: October 2023.

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GENERAL INFORMATION
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ReadMe Author: TAKFARINAS MEDJNOUN, University of Southampton [https://orcid.org/0000-0002-8699-1305]

Date of data collection: 2018

Information about geographic location of data collection: University of Southampton

Related projects: 
1 - Surface-specific Moody-diagrams: A new paradigm to predict drag penalty of realistic rough surfaces with applications to maritime transport EPSRC: Ref No: EP/P009638/1
2 - B Ganapathisubramani - Turbulent flow over multi scale heterogeneous surfaces EPSRC: Ref No: EP/P021476/1

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SHARING/ACCESS INFORMATION
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Licence: CC-BY

This dataset presents the experimental data described in "Medjnoun et al., Assessment of aerodynamic roughness parameters of turbulent boundary layers over barnacle-covered surfaces, Experiments in Fluids, 2023. DOI: https://doi.org/10.1007/s00348-023-03709-552828977-6b10-40af-8586-bbb4bb9e6abc. PLEASE FOLLOW THE DOI FOR THE PAPER TO CITE WHEN REFERRING TO THE DATA.

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DATA & FILE OVERVIEW
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This dataset contains:
The important data that is required to reproduce the plots in the figures of the paper (filenames are given accordingly), normalisation quantities (where applicable).
The quantities are saved in .mat files whose labels are explained below. 

1. The file "DragDataConfig1.mat" and "DragDataConfig2" contains a drag balance data for Config 1 and 2, respectively.
The variable are a (1,9) variables with 1 being the average of 5 repetitions and 9 being the speeds: 
- Nu_MEAN:             	Air kinematic viscosity (m^2/s)
- Re_MEAN:        	Unit Reynolds number - multiply by 3.2 m to get the measurement location Rex 
- Ut_MEAN:       	Friction velocity (m/s)
- Cf_MEAN:		Skin-friction coefficient
- u_Ut_MEAN:		Total uncertainty in the friction velocity (m/s)
- u_cf_MEAN:		Total uncertainty in skin-friction coefficient

2. The file "PIVProfiles.mat" contains spanwise (or streamwise) averages of wall-normal profiles from the PIV measurements -  
The file contains variable cells of (1,14) size with 1:7 being Config 1 and 8:14 are for Config 2
- X_proflie,Y_proflie	The spanwise/streamwise and wall-normal coordinate matrices in (m) - see Table 3 from the paper for reference.
- U_span_av:        	The time-spatial(stream or span directions, depending if planar or stereo) averaged streamwise (m/s)
- Ruu,Rvv,Ruv_span_av:  The time-spatial(stream or span directions, depending if planar or stereo) averaged Reynolds stresses (m/s)
- Duu,Dvv,Duv_span_av:  The time-spatial(stream or span directions, depending if planar or stereo) averaged dispersive stresses (m/s)
- Tuu,Tvv,Tuv:		The time-spatial(stream or span directions, depending if planar or stereo) averaged total stresses (m/s)

3. The file "AerodynamicParametersDat.mat" contains aerodynami roughness parameters presented in Table 4 
The file contains the following: a
- P_atm:             		Ambient pressure (mb)
- T_atm: 			Ambient temperature (degC)
- nu: 				Kinematic viscosity (m^2/s)
- Uinf:				Freestream speeds (m/s)
- Utau,Utau_OLS,Utau_CSS: 	Friction velocity from the different methods (m/s)
- zpd,zpd_OLS,zpd_CSS:		Zero-plane displacement (m)
- duplus,duplus_OLS,duplus_CSS:	Roughness function
- Wc,Wc_OLS,Wc_CSS: 		Wake strength parameters
- ksand1,ksand1_DB,ksand1_OLS,ksand1_CSS: Equivalent sandgrain roughness height (m) for Config 1
- ksand2,ksand2_DB,ksand2_OLS,ksand2_CSS: Equivalent sandgrain roughness height (m) for Config 2
- delta: 			Boundary layer thickness (m)

4. The folder "Hom_Irreg_TBL_Exp_Barnacle_Medjnoun_2023" contains the biofouling rough surface and its statistical characteristics, with its documentation. 
