Analysis of model test results was carried out to investigate the hydrodynamic interaction between pairs of fixed or elastically supported rigid cylinders of dissimilar diameters in a water flume. The two cylinders are placed with one situated in the wake of the other. The spacing between the cylinders ranges from 1 to 15 times the larger cylinder diameter. The Reynolds numbers are within the subcritical range. For the vibrating cylinders which are free to oscillate in both the in-line and the cross-flow directions, the reduced velocity ranges from 1 to 13 and the low damping ratio of the test setup at 0.006 gives a combined mass-damping parameter of 0.02. For the fixed cylinders, the downstream cylinder experiences a drag reduction and it was found that this drag reduction also depends upon the diameter ratio. The lift on the fixed downstream cylinder has the frequency components derived from the upstream cylinder's vortex shedding as well as from its own vortex shedding, and the relative importance of the two sources is influenced by the spacing between the two cylinders. This is reflected in the downstream cylinder's vortex induced vibration (VIV) response which appears to be dependent upon the actual reduced velocities of both the cylinders.

References

References
1.
Zdravkovich
,
M. M.
,
2003
,
Flow Around Circular Cylinders—Vol 2: Applications
,
Oxford University Press
,
Oxford
.
2.
Hover
,
F. S.
, and
Triantafyllou
,
M. S.
,
2001
, “
Galloping Response of a Cylinder With Upstream Wake Interference
,”
J. Fluids Struct.
,
15
, pp.
503
512
.10.1006/jfls.2000.0364
3.
Assi
,
G. R. S.
,
Meneghini
,
J. R.
,
Aranha
,
J. A. P.
,
Bearman
,
P. W.
, and
Casaprima
,
E.
,
2006
, “
Experimental Investigation of Flow-Induced Vibration Interference Between Two Circular Cylinders
,”
J. Fluids Struct.
,
22
, pp.
819
827
.10.1016/j.jfluidstructs.2006.04.013
4.
Korkischko
,
I.
, and
Meneghini
,
J. R.
,
2010
, “
Experimental Investigation of Flow-Induced Vibration on Isolated and Tandem Circular Cylinders Fitted With Strakes
,”
J. Fluids Struct.
,
26
, pp.
611
625
.10.1016/j.jfluidstructs.2010.03.001
5.
Zdravkovich
,
M. M.
,
1985
, “
Flow Induced Oscillation of Two Interfering Circular Cylinders
,”
J. Sound Vib.
,
101
, pp.
511
521
.10.1016/S0022-460X(85)80068-7
6.
Laneville
,
A.
, and
Brika
,
D.
,
1999
, “
The Fluid and Mechanical Coupling Between Two Circular Cylinders in Tandem Arrangement
,”
J. Fluids Struct.
,
13
, pp.
967
986
.10.1006/jfls.1999.0245
7.
Huera-Huarte
,
F. J.
, and
Bearman
,
P. W.
,
2011
, “
Vortex and Wake-Induced Vibrations of a Tandem Arrangement of Two Flexible Circular Cylinders With Near Wake Interference
,”
J. Fluids Struct.
,
27
, pp.
193
211
.10.1016/j.jfluidstructs.2010.11.004
8.
Igarashi
,
T
.,
1982
, “
Characteristics of a Flow Around Two Circular Cylinders of Different Diameters in Tandem
,”
Bull. Jpn. Soc. Mech. Eng.
,
25
, pp.
349
357
.10.1299/jsme1958.25.349
9.
Wu
,
W.
,
Huang
,
S.
, and
Barltrop
,
N.
,
2002
, “
Current Induced Instability of Two Circular Cylinders
,”
Appl. Ocean Res.
,
24
, pp.
287
297
.10.1016/S0141-1187(03)00003-8
10.
Huse
,
E
.,
1993
, “
Interaction in Deep-Sea Riser Arrays
,”
Offshore Technology Conference
,
Houston, TX
.
10.4043/7237-MS
11.
Schlichting
,
H.
,
1968
,
Boundary Layer Theory
,
McGraw-Hill
,
New York.
12.
Blevins
,
R. D.
, and
Saint-Marcoux
,
J. F.
,
2011
, “
Wake of a Vibrating Cylinder at Re = 105
,” Proceedings of the
ASME
30th International Conference on Ocean,
Offshore and Arctic Engineering
,
Rotterdam, The Netherlands
.
10.1115/OMAE2011-49075
13.
Cantwell
,
B.
, and
Coles
,
D.
,
1983
, “
An Experimental Study of Entrainment and Transport in the Turbulent Near Wake of a Circular Cylinder
,”
J. Fluid Mech.
,
136
, pp.
321
374
.10.1017/S0022112083002189
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