331 : Stereo-PIV (shear jet flow)
| No. | 331 | Unit |
| Image Size | 256 x 256 | pixel |
| Area | 4 x 4 | cm |
| Laser Illumination | Sheet | mm |
| Interval | 0.005 | sec |
| Max. Velocity | 10 | pixel/interval |
| Max. out-of-plane Velocity | 15 | % |
DATA DOWNLOAD
- The format of the images are BMP data.[64KB]
- The particle data file[100KB] contains;
(1) particle ID, (2-4) particle 3d location [x,y,z] (cm),
(5,6) particle location in Image 0 [X,Y] and
(7,8) particle location in Image 1 [X,Y] and
(9,10) particle location in Image 2 [X,Y] and
(11) maximum intensity of the particle [I].
The particle ID is unique, so that the same particle
location could be correctly tracked with using the serial particle files.
Please see the example
- The vector file[50KB] contains;
(1-3) node of the image (X,Y,Z) [cm] and
(4-6) vector (U,V,W) in the unit of [cm/s]
Please see the example
Standard Image #331 (3 direction / 200 frame : 000-200)
PIV Three-dimensional Standard Images #331
Generator: K. Okamoto (Univ. Tokyo)
Program: ddr.c
Date: January 22, 1999
Parameters:
Target Flow Field: Jet impinging on the Wall
Reynolds Number: 3000
2cm
------------| |------------
| 15cm/s
V
XXX
XXX
-----------------------------
Number of Particles inserted in the field 150000 Particles
Number of Particles visualized in one Image 4000 Particles (average)
Diameter of Particles 5 pixel (average)
2 (standard deviation)
1 (minimum)
Maximum Velocity 12 cm/s
Target Flow field 4cm x 4cm x 2cm
Visualized Flow field 1.2cm x 1.2cm x 0.2cm
Time Interval between images 5 msec
Laser Illumination Sheet illumination [2mm]
Water refractive index 1.33
Wall distance 3 cm from center
orientation parallel to #1 camera image
Camera positions
#0 Distance from center 6 cm
angle to X axis -30 degree
#1 Distance from center 6 cm
angle to X axis 0 degree
#2 Distance from center 6 cm
angle to X axis 30 degree
No orientation variations were considered.
^ y
|
|/
------------+---------------> x
/|
/ |
/
/z
L
TOP VIEW
|
O| Particles
--------------+-----------------> x-axis
/|
/ |
/ | n=1.33(water)
==============|===================== WALL
/ | n=1.00(air)
/theta|
/ (-30)|(30)
/ |
#0 | #2 camera
camera |
#1 camera
|
| z-axis
V
Image Files (imX???.raw)
X: camera# (0-2)
???: serial# (000-144) Total 720msec
Image size 256x256 pixel (8bit:256)
Calibration File (imX999.raw)
Particles (Total 49 particles)
x = -0.6, -0.4, -0.2, 0, 0.2, 0.4, 0.6 cm
y = -0.6, -0.4, -0.2, 0, 0.2, 0.4, 0.6 cm
z = 0 cm
Vector files (vec???.dat)
x y z u v w
-0.80 -0.80 -0.80 0.17542 -4.51977 0.01204
-0.80 -0.80 -0.60 -0.18245 -4.11870 -0.26516
-0.80 -0.80 -0.40 -0.78761 -3.38484 -0.41633
unit: x,y,z [cm]
u,v,w [cm/s]
Particle Files (ptc???.dat)
#1 camera #2 camera #3 camera intensity
ID x y z X Y X Y X Y
4 -0.301 0.584 0.893 147.61 64.91 95.55 65.10 53.07 65.92 208.18
6 -0.898 1.266 -0.258 0.00 0.00 0.00 0.00 46.22 0.15 208.69
8 1.178 0.886 0.149 249.88 38.07 251.10 35.42 219.99 32.46 191.52
9 0.720 -1.242 -0.530 183.76 252.88 201.24 254.40 0.00 0.00 211.21
unit: x,y,z [cm]
X,Y [pixel]
The particle ID is unique number, therefore, the same particle could
be easily tracked with checking the ID for serial particle files.
If you have any questions, please contact Dr. Okamoto
(okamoto@tokai.t.u-tokyo.ac.jp)
