The control of flow in the wake of a circular cylinder by an attached permeable plate having various porosity ratios was analyzed experimentally using both particle image velocimetry (PIV) and dye visualization techniques. The force measurements were also done in order to interpret the effect of control method on drag coefficient. The diameter of the cylinder and length to diameter ratio of the plate were kept constant as D = 50 mm and L/D = 1.0, respectively. The porosity ratio, β, which can be defined as the ratio of open surface area to the whole body surface area, was taken as β = 0.4, 0.5, 0.6, 0.7, and 0.8 (permeable plates). The study was performed considering deep water flow conditions with a constant Reynolds number of ReD = 5000 based on the cylinder diameter. Each permeable plate was attached on the separation point and the results were compared with the results of cylinder without permeable plate (plain cylinder) in order to understand the control effect. Both qualitative and quantitative results revealed that the permeable plates of 0.4 ≤ β ≤ 0.6 are effective on controlling the unsteady flow structure downstream of the cylinder, i.e., the vortex formation length was increased, turbulent statistics was reduced and vortex shedding frequency was diminished when the permeable plate attached normal to the cylinder surface from the lower separation point. However, the drag force acting on the cylinder was found to be increased due to the increased cross-sectional area.

References

References
1.
Choi
,
H.
,
Jeon
,
W.
, and
Kim
,
J.
,
2008
, “
Control of Flow Over a Bluff Body
,”
Annu. Rev. Fluid Mech.
,
40
(
1
), pp.
113
139
.
2.
Kumar
,
R. A.
,
Sohn
,
C.-H.
, and
Gowda
,
B. H. L.
,
2008
, “
Passive Control of Vortex-Induced Vibrations: An Overview
,”
Recent Pat. Mech. Eng.
,
1
(
1
), pp.
1
11
.
3.
Unal
,
M. F.
, and
Rockwell
,
D.
,
1988
, “
On Vortex Formation From a Cylinder, Part 2. Control by Splitter-Plate Interference
,”
J. Fluid Mech.
,
190
, pp.
513
529
.
4.
Kwon
,
K.
, and
Choi
,
H.
,
1996
, “
Control of Laminar Vortex Shedding Behind a Circular Cylinder Using Splitter Plates
,”
Phys. Fluids
,
8
(
2
), pp.
479
486
.
5.
Rathakrishnan
,
E.
,
1999
, “
Effect of Splitter-Plate on Bluff Body Drag
,”
AIAA J.
,
37
(
9
), pp.
1125
1126
.
6.
Akilli
,
H.
,
Sahin
,
B.
, and
Tumen
,
N. F.
,
2005
, “
Suppression of Vortex Shedding of Circular Cylinder in Shallow Water by a Splitter Plate
,”
Flow Meas. Instrum.
,
16
(
4
), pp.
211
219
.
7.
Akilli
,
H.
,
Karakus
,
C.
,
Akar
,
A.
,
Sahin
,
B.
, and
Tumen
,
N. F.
,
2008
, “
Control of Vortex Shedding of Circular Cylinder in Shallow Water Flow Using an Attached Splitter Plate
,”
ASME J. Fluids Eng.
,
130
(
4
), p.
041401
.
8.
Dehkordi
,
B. G.
, and
Jafari
,
H. H.
,
2010
, “
On the Suppression of Vortex Shedding From Circular Cylinders Using Detached Short Splitter-Plates
,”
ASME J. Fluids Eng.
,
132
(
4
), p.
044501
.
9.
Ozkan
,
G. M.
,
Oruc
,
V.
,
Akilli
,
H.
, and
Sahin
,
B.
,
2012
, “
Flow Around a Cylinder Surrounded by a Permeable Cylinder in Shallow Water
,”
Exp. Fluids
,
53
(
6
), pp.
1751
1763
.
10.
Liu
,
H.
,
Wei
,
J.
, and
Qu
,
Z.
,
2013
, “
The Interaction of Porous Material Coating With the Near Wake of Bluff Body
,”
ASME J. Fluids Eng.
,
136
(
2
), p.
021302
.
11.
Ashtiani
,
A. I.
,
Hooman
,
K.
, and
Khashehchi
,
M. A.
,
2014
, “
A Comparison Between the Separated Flow Structures Near the Wake of a Bare and a Foam-Covered Circular Cylinder
,”
ASME J. Fluids Eng.
,
136
(
12
), p.
121203
.
12.
Durhasan
,
T.
,
Aksoy
,
M. M.
,
Pinar
,
E.
,
Ozkan
,
G. M.
,
Akilli
,
H.
, and
Sahin
,
B.
,
2016
, “
Vortex Street Suppression of a Circular Cylinder Using Perforated Semi-Circular Fairing in Shallow Water
,”
Exp. Therm. Fluid Sci.
,
79
, pp.
101
110
.
13.
Pinar
,
E.
,
Ozkan
,
G. M.
,
Durhasan
,
T.
,
Aksoy
,
M. M.
,
Akilli
,
H.
, and
Sahin
,
B.
,
2015
, “
Flow Structure Around Perforated Cylinders in Shallow Water
,”
J. Fluid Struct.
,
55
, pp.
52
63
.
14.
Çengel
,
Y. A.
, and
Cimbala
,
J. M.
,
2006
,
Fluid Mechanics: Fundamentals and Applications
,
McGraw-Hill Higher Education
,
Boston, MA
, p.
585
.
15.
Kline
,
S.
, and
McClintock
,
F. A.
,
1953
, “
Describing Uncertainties in Single-Sample Experiments
,”
Mech. Eng.
,
75
(
1
), pp.
3
8
.
16.
Dong
,
S.
,
Karniadakis
,
G. E.
,
Ekmekci
,
A.
, and
Rockwell
,
D.
,
2006
, “
A Combined Direct Numerical Simulation–Particle Image Velocimetry Study of the Turbulent Near Wake
,”
J. Fluid Mech.
,
569
, pp.
185
207
.
17.
Blevins
,
R. D.
,
1990
,
Flow-Induced Vibration
,
Van Nostrand Reinhold Company
,
New York
.
18.
Khalak
,
A.
, and
Williamson
,
C. H. K.
,
1996
, “
Dynamics of Hydroelastic Cylinder With Very Low Mass and Damping
,”
J. Fluid Struct.
,
10
(
5
), pp.
455
472
.
19.
Aljure
,
D. E.
,
Rodriguez
,
I.
,
Lehmkuhl
,
O.
,
Perez-Segarra
,
C. D.
, and
Oliva
,
A.
,
2015
, “
Influence of Rotation on the Flow Over a Cylinder at Re = 5000
,”
Int. J. Heat Fluid Flow
,
55
, pp.
76
90
.
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