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Research Papers: Fluid-Structure Interaction

Sloshing in a Horizontal Cylindrical Tank Subjected to Pitching Excitation and Damping Effects by Perforated Plates

[+] Author and Article Information
Hidemitsu Sakai

Technical Center,
Nissan Motors Co.,
Okatsukoku, Atsugi 560-2, Japan
e-mail: sakahide0107@gmail.com

Akane Uemichi

Department of Mechanical Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-Ku,
Tokyo 113-0033, Japan
e-mail: uemichi@fiv.t.u-tokyo.ac.jp

Akihiro Takai

Department of Mechanical Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-Ku,
Tokyo 113-0033, Japan
e-mail: atakai@fiv.t.u-tokyo.ac.jp

Yudai Yamasaki

Department of Mechanical Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-Ku,
Tokyo 113-0033, Japan
e-mail: yudai_y@fiv.t.u-tokyo.ac.jp

Shigehiko Kaneko

Mem. ASME
Department of Mechanical Engineering,
The University of Tokyo,
7-3-1 Hongo, Bunkyo-Ku,
Tokyo 113-0033, Japan
e-mail: kaneko@mech.t.u-tokyo.ac.jp

1Corresponding author.

Contributed by the Pressure Vessel and Piping Division of ASME for publication in the JOURNAL OF PRESSURE VESSEL TECHNOLOGY. Manuscript received December 25, 2016; final manuscript received March 27, 2017; published online April 24, 2017. Assoc. Editor: Tomomichi Nakamura.

J. Pressure Vessel Technol 139(4), 041302 (Apr 24, 2017) (9 pages) Paper No: PVT-16-1247; doi: 10.1115/1.4036429 History: Received December 25, 2016; Revised March 27, 2017

Natural gas is relatively clean, and its demand is currently increasing. In most cases, gas fields are located at the bottom of the sea. Therefore, floating production, storage, and offloading (FPSO) systems are now attracting considerable attention. This paper is related to the dynamical design of a FPSO system; in particular, it focuses on the free surface elevation induced by the waves in a horizontal cylindrical and axisymmetric liquid vessel with end caps. In this study, the theory of the wave height and resonant frequency in a horizontal cylinder subjected to pitching via external excitation is developed. Then, a theory taking into account the effect of perforated plates is introduced. A special discussion is made with regard to the number and location of the perforated plates and the effect of a partial opening in a perforated plate on the damping. Finally, the experimental data of resonant wave heights up to the third mode are shown in comparison to the theoretically derived results.

Copyright © 2017 by ASME
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References

Figures

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Fig. 1

Floating production, storage, and offloading system (FPSO)

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Fig. 2

Sectional view of a horizontal cylindrical container used for FPSO

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Fig. 3

Conversion from a cylindrical to an equivalent rectangular container

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Fig. 4

Analytical model of sloshing under pitching excitation in the case without perforated plates

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Fig. 5

Analytical model of sloshing under pitching excitation in the case with a perforated plate

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Fig. 6

Modeling the damping effect of a perforated plate

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Fig. 7

Modeling of the damping effect with a large aperture

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Fig. 8

Experimental apparatus for pitching excitation

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Fig. 9

Container and perforated plate: (a) the cylindrical container and (b) the perforated plate

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Fig. 10

Pitch diameter ratio of the perforated plate

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Fig. 11

Frequency response without a perforated plate

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Fig. 12

Observed resonant modes: (a) first mode and (b) third mode

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Fig. 13

Tested setting patterns: (a) one plate, (b) two plates, and (c) three plates

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Fig. 14

Frequency response with one perforated plate

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Fig. 15

Observed resonant modes: (a) second mode and (b) fourth mode

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Fig. 16

Wave form of the second excited mode

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Fig. 17

Frequency response with two perforated plates

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Fig. 18

Frequency response with three perforated plates

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Fig. 19

The case of a plate with a large aperture: (a) perforated plate with a large aperture and (b) the location of the plate

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Fig. 20

Frequency response of a perforated plate with a large aperture (see figure online for color)

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Fig. 21

Target horizontal cylindrical container

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Fig. 22

Estimated resonant wave height

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