This paper investigates the characteristics of the suppression of sloshing in a vessel by a bulkhead that divides the vessel vertically into two sections but allows communication between two sections at the lower part of the vessel. The sloshing behavior is thus separated into a U-tube sloshing mode and a sloshing mode confined to each of the separated compartments. The effect of the aperture height beneath the bulkhead and the amplitude of the excitation on the characteristics of the suppression of the U-tube sloshing mode is investigated experimentally. As a result, the following phenomena are clarified. Three types of flow patterns were observed: flow pattern A, with unsteady vortices, flow pattern B, with a single swirl and a vortex, and flow pattern C, with twin swirls. The flow pattern changes from A to B or C as the amplitude of the excitation increases. The damping ratio with the bulkhead is much larger than that without the bulkhead. The damping generated by the bulkhead depends on the amplitude of the excitation. The flow pattern plays an important role in the dissipation of the energy of the sloshing. In particular, the vortices and swirls increase the rate of energy dissipation of the sloshing.

Issue Section:
Fluid-Structure Interaction
Keywords:
damping, earthquake engineering, flow instability, sloshing, vortices, water storage
Topics:
Breakwaters, Damping, Flow (Dynamics), Sloshing, Vessels, Vortices, Excitation
1.
Rinne
,
J. E.
, 1967, “
Oil Storage Tanks
,”
The Prince William Sound, Alaska Earthquake of 1964 and Aftershocks
, Vol.
2-A
,
U.S. Government Printing Office
,
Washington, DC
, pp.
245
–
252
.
2.
National Fire Defense Agencies of Japan
, 1965, “
A Study About Niigata Earthquake—1965
,” Zenkoku Kajyo Hourei, pp.
1
–
224
(in Japanese).
3.
Shibata
,
H.
, 1969, “
Observation of Damages of Industrial in Niigata Earthquake
,”
Proceedings of 4th World Conference of Earthquake Engineering
,
Santiago de Chile
, January 13–18, Vol.
3
.
4.
Fire Defense Agencies of Tokyo, 1983, “
A Report of Mid-Japan Sea Earthquake in 1983
,” pp.
1
–
100
(in Japanese).
5.
The Special Investigation Committee on Great Hanshin Awaji Earthquake Damage
, 1996, “
The Machines and Industrial Equipments Damage Due to the Southern Hyougo-Prefecture Earthquake
,” Japan Society of Mechanical Engineers, Maruzen, Vol.
51
, pp.
87
–
103
(in Japanese).
8.
Hayama
,
S.
, and
Iwabuchi
,
M.
, 1985, “
Sloshing Suppression Using Inverse U-Tube
,”
Trans. Jpn. Soc. Mech. Eng., Ser. C
0387-5024,
51-470
, pp.
2505
–
2511
(in Japanese).
9.
Hara
,
F.
, 1992, “
Identification of Sloshing Suppression Force Generated by Intermittent Gas-Bubble Injection
,”
Proceedings of the 1st MOVIC
,
Yokohama, Japan
, September, pp.
1110
–
1115
.
10.
Silverman
,
S.
, and Abramson, S, 1966, “
The Dynamic Behavior of Liquid in Moving Containers
,” NASA, Report No. SP-106, pp.
13
–
78
11.
Kobayashi
,
N.
,
Mieda
,
T.
,
Jitsu
,
K.
, and
Shibata
,
H.
, 1995, “
Sloshing Suppression by Bulkhead in Cylindrical and Co-Axial Cylindrical Liquid Vessels
,”
Proceedings of the Pressure Vessel and Piping Conferance
,
Hawaii
, July 23–27, PVP-Vol.
314
, pp.
1
–
6
.
12.
Ishikawa
,
M.
, and
Kagawa
,
Y.
, 1987,
Modal Analysis
,
Ohm Co.
,
Tokyo
, pp.
159
–
186
(in Japanese).
Copyright © 2008
 by American Society of Mechanical Engineers
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