TURBULENT JUNCTION VORTEX FLOW
The data set presented here is for the mean flow structure around
and within a turbulent junction vortex. The flow field is generated
by a streamlined cylinder set normal to a flat plate.
A brief description of the flow is given below. For more details
on the geometry, flow conditions, coordinates, velocity components,
pressure coefficients, instrumentation, calibration methods, data
acquisition methods, data processing methods and uncertainty
analysis, see references [1, 2, 4] for the pressure probe data, and
reference [5] for the LDV data. References [1] and [2] are available
from NTIS, reference [5] is available from University Microfilms, and
reference [4] ia available from both NTIS and from University
Microfilms. Different portions of the work have been presented in
several journal and conference papers, and these are also listed in
the references. Reference [3] includes some hot wire data for the
flow, but this hot wire data is not included in this file and is only
available in the report, available from NTIS.
The pressure probe data files following are contained in references
[1], [2] and [3]. The LDV data are contained in reference [5].
Reference [4] contains the most detailed description of the pressure
probe work, but does not contain all the pressure probe data.
The junction vortex flow is generated by a streamlined circular
cylinder placed normal to a flat plate. The cylinder has a circular
leading edge shape with 127 mm diameter and has a straight taper
to a sharp trailing edge for a length or chord of 298 mm. The
cylinder is 229 mm high and is placed in a 2DTBL approximately
80 mm thick. The Reynolds number based on cylinder thickness
(diameter) is 170,180 and the upstream boundary layer momentum
Reynolds number is 10,840. All data were taken at a fixed tunnel
unit Reynolds number to maintain dynamic similarity.
The data set boxes a region of flow which extends from 203 mm
upstream of the leading edge of the body to the trailing edge of
the body. The width of the region is 203 mm and the height is
140.8 mm. Five-hole probe data on all faces of this boxed region
plus two additional planes are reported. Surface pressure data on
the flat floor and the side of the body are also reported. In
addition, very detailed LDV data highlighting the junction vortex
in the upstream plane of symmetry are reported.
The uncertainities associated with the data are given in all
cases, except a few exceptions. The uncertainities are given
immediately after the data, and are separated from the data by
a plus (+) sign. These should be read as plus or minus but the
plus/minus symbol is not available.
All velocity data are normalised by the velocity at the throat
of the tunnel.
The coordinate system used has the origin on the leading edge
of the body. The positive x direction is in the downstream
direction and the positive y direction is going up from the floor.
The positive z direction is the direction consistent with a right
handed coordinate system.
The data set consists of eighteen separate files. The first ten
files are identical in content to the script files used to generate
the tables in reference [1] and document the flow upstream and
around the junction vortex. The next seven files are identical in
content to the script files used to generate the tables in reference
[2] and document the near wake flow. The last file contains the LDV
plane of symmetry data contained in reference [5]. These script
files have been edited for more convenient use as a computer data
base.
1. CPBODY (Table A1 ref [1])
Contains surface pressure coefficient data on the side of
the body. The data format is
x y CP
(mm) (mm)
2. CPFLOOR1 (Table A2 ref [3])
Contains early surface pressure coefficient data on the flat
floor from ref [2] and originally in ref [3]. The format is
x z CP
(mm) (mm)
3. CPFLOOR2 (Table A3 ref [1])
Contains surface pressure coefficient data on the flat
floor. The format is same as CPFLOOR1.
4. UPSTREAM (Table B1, ref [1])
Contains five-hole probe data for the upstream plane. This
plane is defined by
x = -203 mm
y = 0 mm to 140.8 mm
z = 0 mm to -203 mm
The data is given in 25 sets, each set for a particular
(x,z) location. The data format for each set is
Line 1 : x (mm) z (mm)
Lines 2-37: y Beta Alpha CPT CPS Speed U V W
mm deg deg
5. FARSIDE (Table B2 ref[1])
Contains five-hole probe data for the remote side plane. It
is defined by
x = -203 mm to 305 mm
y = 0 mm to 140.8 mm
z = -203 mm
The data is given in 39 sets, each set for a particular
(x,z) location. The data format is the same as UPSTREAM.
6. TOP (Table B3 ref [1])
Contains data for the top surface. This plane is defined by
x = -203 mm to 305 mm
y = 140.8 mm
z = 0 mm to -203 mm
Contains four sets of data. The data format for set 1 is
Line 1 : y (mm) z (mm)
Lines 2-26: x Beta Alpha CPT CPS Speed U V W
mm deg deg
The data format for sets 2-4 is
Line 1 : y (mm) z (mm)
Lines 2-42: x Beta Alpha CPT CPS Speed U V W
mm deg deg
7. SYMMETRY (Table B4 ref [1])
Contains five-hole probe data for the upstream symmetry
plane. This plane is defined by
x = -203 mm to 0 mm
y = 0 mm to 140.8 mm
z = 0 mm
The data is in 16 sets. Format for sets 1-12 is
Line 1 : x (mm) z (mm)
Lines 2-37: y Alpha CPT CPS Speed U V
mm deg
The format for sets 13-14 is
Line 1 : x (mm) z (mm)
Lines 2-36: y Alpha CPT CPS Speed U V
mm deg
The format for set 15 is
Line 1 : x (mm) z (mm)
Lines 2-35: y Alpha CPT CPS Speed U V
mm deg
The format for set 16 is
Line 1 : x (mm) z (mm)
Lines 2-32: y Alpha CPT CPS Speed U V
mm deg
8. CHORD43 (Table B5 ref [1])
Contains five-hole probe data for the 43% chord plane. This
plane is defined by
x = 127 mm
y = 0 mm to 140.8 mm
z = 0 mm to -203 mm
The data is given in 14 sets, each set for a particular
(x,z) location. The data format for each set is
Line 1 : x (mm) z (mm)
Lines 2-37: y Beta Alpha CPT CPS Speed U V W
mm deg deg
9. CHORD100 (Table B6 ref [1])
Contains five-hole probe data for the 100% chord plane. This
plane is defined by
x = 305 mm
y = 0 mm to 140.8 mm
z = 0 mm to -203 mm
The data is given in 22 sets, each set for a particular
(x,z) location. The data format for each set is
Line 1 : x (mm) z (mm)
Lines 2-37: y Beta Alpha CPT CPS Speed U V W
mm deg deg
10. NEARSIDE (Table B7 ref [1])
Contains five-hole probe data for the near side plane. This
plane is defined by
x = -203 mm to 305 mm
y = 0 mm to 140.8 mm
z = -114 mm
The data is given in 12 sets, each set for a particular
(x,z) location. The data format for each set is
Line 1 : x (mm) z (mm)
Lines 2-37: y Beta Alpha CPT CPS Speed U V W
mm deg deg
11. CPFLOORD (Table A ref [2])
Contains surface pressure coefficient data on the flat
floor from ref [2]. The format is
x z CP
(mm) (mm)
12. SYMMTRYD (Table B1 ref [2])
Contains five-hole probe data for the downstream symmetry
plane. This plane is defined by
x = 305 mm to 610 mm
y = 0 mm to 140.8 mm
z = 0 mm
The data is given in 31 sets, each for a particular (x, z=0)
location. The data format for each set is
Card 1 : x (mm) z (mm)
Cards 2-37: y Alpha CPT CPS Speed U V
mm deg
13. FARSIDED (Table B2 ref [2])
Contains five-hole probe data for the downstream remote side
or streamwise plane. This plane is defined by
x = 318 mm to 610 mm
y = 0 mm to 140.8 mm
z = -203 mm
The data is given in 24 sets, each set for a particular (x,z)
location. The data format for each set is
Card 1 : x(mm) z(mm)
Cards 2-37: y Beta Alpha CPT CPS Speed U V W
mm deg deg
14. NEARSDED (Table B3 ref [2])
Contains five-hole probe data for the downstream near side
or streamwise plane. This plane is defined by
x = 343 mm to 559 mm
y = 0 mm to 140.8 mm
z = -114 mm
The data is given in 5 sets, each set for a particular (x,z)
location. The data format for each set is the same as set #14.
15. CHORD150 (Table B4 ref [2])
Contains five-hole probe data for the 150% chord plane.
This set contains more data than in the corresponding Table B4
in ref [2]. This plane is defined by
x = 457 mm
y = 0 mm to 140.8 mm
z = 0 mm to -203 mm
The data is in 23 sets, each for a particular (x,z) location.
The data format for each set is the same as set #14.
16. CHORD200 (Table B5 ref [2])
Contains five-hole probe data for the 200% chord plane.
This set contains more data than in the corresponding Table B5
in ref [2]. This plane is defined by
x = 610 mm
y = 0 mm to 140.8 mm
z = 0 mm to -203 mm
The data is in 23 sets, each for a particular (x,z) location.
The data format for each set is the same as set #14.
17. TOPD (Table B6 ref[2])
Contains five-hole probe data for the top surface. This plane
is defined by
x = 305 mm to 610 mm
y = 0 mm to 140.8 mm
z = -38 mm to -152 mm
The data is in 4 sets, each for a particular (y,z) location.
The data format for each set is
Card 1 : y (mm) z (mm)
Cards 2-26: x Beta Alpha CPT CPS Speed U V W
mm deg deg
18. LDV2D (ref [5])
Contains the LDV data for the upstream symmetry plane. The
data is for the region given by
x/D = -1 to -0.0126
y/D = 0.018 to 0.310
z = 0 mm
where D = Diameter of the body = 127 mm
The data is in 44 sets. Format for sets 1-6 is
Line 1 : x/D z/D
Lines 2-21: y/D U V
The format for sets 7-44 is
Line 1 : x/D z/D
Lines 2-45: y/D U V
References :
1. Pierce, F. J., et al., "The Mean Flow Structure of a Turbulent
Junction Vortex", Rept. VPI-E-87-6, April 1987 (available NTIS).
2. Pierce, F. J., et al., "The Mean Flow Structure in the Near Wake
of a Turbulent Junction Vortex", Rept. VPI-E-87-26, December 1987
(available NTIS).
3. Pierce, F. J., et al., "The Mean Flow Structure Around and Within
a Turbulent Junction Vortex", Rept. VPI-E-85-19, September 1985
(available NTIS).
4. Harsh, M. D., "An Experimental Investigation of a Turbulent
Junction Vortex", PhD Dissertation, Mechanical Engineering,
Virginia Polytechnic Institute and State University, January
1985 (available University Microfilms). Also available as
Harsh, M. D., and F. J. Pierce, "An Experimental Investigation
of a Turbulent Junction Vortex", Rept. VPI-E-85-4, February 1985
(available NTIS).
5. Tree, I. K., "Laser Doppler Velocimeter Measurements in a
Turbulent Junction Vortex", PhD Dissertation, Mechanical
Engineering, Virginia Polytechnic Institute and State University
June 1886 (available University Microfilms).
6. Pierce, F. J., and J. Shin, "The Development of a Turbulent
Junction Vortex System", JFE, Trans ASME, 114, Dec 1992.
7. Pierce, F. J., "The Turbulent Junction Vortex as a Standard
Test Case for Three-Dimensional Solvers", AIAA J, 29, Jan 1991
8. Pierce, F. J., and S. Nath, "Inteference Drag of a Turbulent
Junction Vortex", JFE, Trans ASME, 112, Dec 1990.
9. Pierce, F. J., and I. K. Tree, "The Mean Flow Structure on the
Symmetry Plane of a Turbulent Junction Vortex", JFE, Trans ASME,
112, Mar 1990.
10. Menna, J.D., and F. J. Pierce, "The Mean Flow Structure Around
and Within a Turbulent Junction or Horseshoe Vortex: Part I: The
Upstream and Surrounding Three-Dimensional Boundary Layer, JFE,
Trans ASME, 110, Dec 1988.
11. Pierce, F. J.,and M. D. Harsh, "The Mean Flow Structure Around
and Within a Turbulent Junction or Horseshoe Vortex: Part II:
The Separated and Junction Vortex Flow", JFE, Trans ASME, 110,
Dec 1988.