READ ME File For 'Dataset: Scale interactions in velocity and pressure within a turbulent boundary layer developing over a staggered-cube array'

Dataset DOI: 10.5258/SOTON/D1633

ReadMe Author: M. Aguiar Ferreira, University of Southampton

This dataset supports the publication: 
AUTHORS: 	M. Aguiar Ferreira and B. Ganapathisubramani
TITLE:		Scale interactions in velocity and pressure within a turbulent boundary layer developing over a staggered-cube array
JOURNAL:	Journal of Fluid Mechanics
PAPER DOI:	doi:10.1017/jfm.2020.999

This dataset contains:
All the relevant data to produce the figures presented in this article.

The figures are as follows:

Flow properties
VAR		DESCRIPTION						UNITS
nu		kinematic viscosity 					m^2/s
U0		freestream velocity 					m/s
delta 		boundary layer thickness 				mm
kappa		Von Karman constant
h		canopy height 						mm
d 		zero-plane displacement 				mm
Ut_b		friction velocity from FE balance 			m/s

Fig. 1  Indicator function and mean velocity profile
VAR		DESCRIPTION						UNITS
y 		wall-normal coordinate vector 				mm
yd_plus		(y-d)^+, viscous normalised wall-normal coordinate
		- displacement thickness
U_plus		viscous normalised mean velocity profile
dUdy		wall-normal gradient streamwise velocity
U_VAR		streamwise turbulence intensity normalised by U_0^2

Fig. 4  Two-point velocity correlations (data as plotted)
VAR		DESCRIPTION						UNITS
y 		wall-normal coordinate vector normalised by h 		mm
alpha 		inclination angle					degrees
Lx 		integral length scale normalised by h

Fig. 5  Scale-decomposed skewness factor
VAR		DESCRIPTION						UNITS
y 		wall-normal coordinate vector normalised by h
see eq 3.4	nomenlature according to equation 3.4


Fig. 6  Drag force statistics
VAR		DESCRIPTION						UNITS
f 		net force on a target roughness element 		N
f_lee		force acting on the leeward side of the obstacle 	N
f_wind		force acting on the windward side of the obstacle 	N
ycp		centre of pressure of the cube, normalised by the
		cube height h
ycp_lee		centre of pressure of the load on the leeward side
		of the cube, normalised by h
ycp_wind	centre of pressure of the load ono the windward side
		of the cube, normalised by h

Fig. 6a
VAR		DESCRIPTION						UNITS
x 		x axis of figure 6a. 
		Fluctuation of the total force acting on a roughness
		element, normalised by the standard deviation
y		y axis of figure 6a.
		Height of the centre of pressure of the cube,
		normalised by the standard deviation.
jpdf		Joint pdf of these events.

Fig. 6b
VAR		DESCRIPTION						UNITS
x		x axis of figure 6b. 
		Force fluctuation on the leeward side of a roughness
		element, normalised by the std of the net force.
y		y axis of figure 6b. 
		Force fluctuation on the windward side of a roughness
 		element, normalised by the std of the net force.
jpdf		Joint pdf of these events


Fig. 7  Conditional analysis
VAR		DESCRIPTION						UNITS
x		streamwise corrdinate vector 				mm
y		wall-normal coordinate vector 				mm
p, u and v 	pressure, streamwise and wall-normal velocities 	Pa, m/s
1		positive excursions of the force signal
2 		negative excursions of the force signal
(example p1, pressure field for posive fluctuations) 

Fig. 10  Effect of amplitude modulation
VAR		DESCRIPTION						UNITS
Fig. 10a
ul		coefficient of the first POD mode of velocity
f 		net force on a target roughness element  		N
Fig. 10b
y		wall-normal coordinate vector normalised by h
Rulps 		correlation coefficient between the large-scale
		velocity signal and the small-scale pressure
		fluctuations
us2ul		(u_L)(u_s)^2
ustd3		(u'^2)^3/2


Date of data collection: 2020

Information about geographic location of data collection: 

Licence: CC BY

Related projects:
Dataset: PIV-based pressure estimation in the canopy of urban-like roughness
doi:10.5258/SOTON/D1267
doi.org/10.1007/s00348-020-2904-1

Date that the file was created: November, 2020