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Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations

Min Luo Orcid Logo, Xiaoming Wang, Xin Jin, Bin Yan

Ocean Engineering, Volume: 211, Start page: 107578

Swansea University Authors: Min Luo Orcid Logo, Xiaoming Wang

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DOI (Published version): 10.1016/j.oceaneng.2020.107578

Abstract

This paper experimentally investigates the three-dimensional sloshing in a membrane-type LNG (liquefied natural gas) tank under combined roll and pitch excitations. Seven groups of roll and pitch amplitudes are studied. For each group, the roll and pitch have the same frequency, and around ten frequ...

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Published in: Ocean Engineering
ISSN: 0029-8018
Published: Elsevier BV 2020
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URI: https://cronfa.swan.ac.uk/Record/cronfa54505
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spelling 2022-11-15T16:34:07.3470652 v2 54505 2020-06-18 Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations 91e3463c73c6a9d1f5c025feebe4ad0f 0000-0002-6688-9127 Min Luo Min Luo true false da81fe94c30a6eb26ed48c083014079f Xiaoming Wang Xiaoming Wang true false 2020-06-18 GENG This paper experimentally investigates the three-dimensional sloshing in a membrane-type LNG (liquefied natural gas) tank under combined roll and pitch excitations. Seven groups of roll and pitch amplitudes are studied. For each group, the roll and pitch have the same frequency, and around ten frequencies are tested in a frequency band that ranges from 0.5 times of the resonance frequency in the length direction of the tank to 1.4 times of the resonance frequency in the tank breadth. The characteristics of the sloshing waves and impact pressures are analysed in detail. It is found that the steady-state sloshing waves can be classified into four patterns: the length-dominant wave, swirling wave, diagonal wave, and breadth-dominant wave. Highlighted is the swirling wave that is observed in most of the cases where the roll and pitch amplitudes are significant and the excitation frequency locates between the resonant frequencies in the two directions. It is hypothesized that the rotational motion of the tank imposes necessary initial conditions to trigger the swirling wave. The swirling wave is always associated with wave impingements at tank corners and induce violent impact pressures. The practical implementation is that reinforcements of the membrane layer should be added or the sloshing wave should be suppressed near the tank corner to mitigate the damages to the interior layer of the membrane-type LNG tank. Journal Article Ocean Engineering 211 107578 Elsevier BV 0029-8018 3D sloshing, Membrane LNG tank, Rotational excitation, Swirling wave, Wave pattern 1 9 2020 2020-09-01 10.1016/j.oceaneng.2020.107578 COLLEGE NANME General Engineering COLLEGE CODE GENG Swansea University 2022-11-15T16:34:07.3470652 2020-06-18T11:20:10.2456770 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Min Luo 0000-0002-6688-9127 1 Xiaoming Wang 2 Xin Jin 3 Bin Yan 4 54505__17533__972ac21f24684053a9138dcfd4d4c6d0.pdf 54505.pdf 2020-06-18T13:40:22.6653735 Output 1096062 application/pdf Accepted Manuscript true 2021-06-16T00:00:00.0000000 Released under the terms of a Creative Commons Attribution Non-Commercial No Derivatives License (CC-BY-NC-ND). true eng
title Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations
spellingShingle Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations
Min Luo
Xiaoming Wang
title_short Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations
title_full Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations
title_fullStr Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations
title_full_unstemmed Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations
title_sort Three-dimensional sloshing in a scaled membrane LNG tank under combined roll and pitch excitations
author_id_str_mv 91e3463c73c6a9d1f5c025feebe4ad0f
da81fe94c30a6eb26ed48c083014079f
author_id_fullname_str_mv 91e3463c73c6a9d1f5c025feebe4ad0f_***_Min Luo
da81fe94c30a6eb26ed48c083014079f_***_Xiaoming Wang
author Min Luo
Xiaoming Wang
author2 Min Luo
Xiaoming Wang
Xin Jin
Bin Yan
format Journal article
container_title Ocean Engineering
container_volume 211
container_start_page 107578
publishDate 2020
institution Swansea University
issn 0029-8018
doi_str_mv 10.1016/j.oceaneng.2020.107578
publisher Elsevier BV
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
document_store_str 1
active_str 0
description This paper experimentally investigates the three-dimensional sloshing in a membrane-type LNG (liquefied natural gas) tank under combined roll and pitch excitations. Seven groups of roll and pitch amplitudes are studied. For each group, the roll and pitch have the same frequency, and around ten frequencies are tested in a frequency band that ranges from 0.5 times of the resonance frequency in the length direction of the tank to 1.4 times of the resonance frequency in the tank breadth. The characteristics of the sloshing waves and impact pressures are analysed in detail. It is found that the steady-state sloshing waves can be classified into four patterns: the length-dominant wave, swirling wave, diagonal wave, and breadth-dominant wave. Highlighted is the swirling wave that is observed in most of the cases where the roll and pitch amplitudes are significant and the excitation frequency locates between the resonant frequencies in the two directions. It is hypothesized that the rotational motion of the tank imposes necessary initial conditions to trigger the swirling wave. The swirling wave is always associated with wave impingements at tank corners and induce violent impact pressures. The practical implementation is that reinforcements of the membrane layer should be added or the sloshing wave should be suppressed near the tank corner to mitigate the damages to the interior layer of the membrane-type LNG tank.
published_date 2020-09-01T04:08:05Z
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score 11.01628

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