Dynamic analysis and design of LNG tanks considering fluid structure interactions
Dynamic analysis and design of LNG tanks considering fluid structure interactions
Following a general description and analysis of the fundamental criteria for the dynamic design concerning dynamic stiffness, strength and environment issues, it is considered that the natural characteristics of the dynamic system and the dynamic responses of the system subject to various dynamic loads are two key critical issues in the dynamic design. Therefore, for the dynamic design of a LNG tank filled with liquid and operated on seaway, it is necessary to accurately predict its natural characteristics and dynamic response considering fluid structure interactions.
To address these two key issues in the dynamic design stage, the developed computer software based on a mixed displacement–pressure finite element model to complete fluid-structure interaction analysis is introduced. An integrated internal liquid-tank-external water interaction system investigated by numerical simulations is summarised to consider the two issues involving the dynamic design of LNG tanks. The five studied cases include: i) 50% filled LNG liquid in a fixed rigid tank, ii) elastic tank only, iii) 50% filled LNG liquid-elastic tank interaction, iv) empty elastic tank-external sea water interaction and v) internally 50% filled LNG liquid-elastic tank-external sea water interaction. The calculated results are compared to reveal the coupling effects on the dynamic design of LNG tanks.
To further demonstrate the effects of the natural characteristics affected by different interactions on the dynamic responses involving the dynamic strength, stiffness and vibration environment problems considered in dynamic design, the numerical simulations of the studied systems subject to regular sea wave excitations and earthquake excitations are carried out. The dynamic displacements for stiffness analysis, the dynamic stress for strength analysis and vibration level for dynamic environment analysis are presented and discussed. Guidelines provided in this paper maybe useful for dynamic designs of LNG tank operating in complex marine environments.
dynamic design, LNG Tank, fluid-structure interaction, dynamic analysis, sea wave excitation, earthquake excitations .
0791838218
1-7
Xiong, Y.P.
51be8714-186e-4d2f-8e03-f44c428a4a49
Xing, J.T.
d4fe7ae0-2668-422a-8d89-9e66527835ce
June 2008
Xiong, Y.P.
51be8714-186e-4d2f-8e03-f44c428a4a49
Xing, J.T.
d4fe7ae0-2668-422a-8d89-9e66527835ce
Xiong, Y.P. and Xing, J.T.
(2008)
Dynamic analysis and design of LNG tanks considering fluid structure interactions.
In 27th International Conference on Offshore Mechanics and Arctic Engineering-OMAE2008, Paper OMAE2008-57937.
ASME.
.
Record type:
Conference or Workshop Item
(Paper)
Abstract
Following a general description and analysis of the fundamental criteria for the dynamic design concerning dynamic stiffness, strength and environment issues, it is considered that the natural characteristics of the dynamic system and the dynamic responses of the system subject to various dynamic loads are two key critical issues in the dynamic design. Therefore, for the dynamic design of a LNG tank filled with liquid and operated on seaway, it is necessary to accurately predict its natural characteristics and dynamic response considering fluid structure interactions.
To address these two key issues in the dynamic design stage, the developed computer software based on a mixed displacement–pressure finite element model to complete fluid-structure interaction analysis is introduced. An integrated internal liquid-tank-external water interaction system investigated by numerical simulations is summarised to consider the two issues involving the dynamic design of LNG tanks. The five studied cases include: i) 50% filled LNG liquid in a fixed rigid tank, ii) elastic tank only, iii) 50% filled LNG liquid-elastic tank interaction, iv) empty elastic tank-external sea water interaction and v) internally 50% filled LNG liquid-elastic tank-external sea water interaction. The calculated results are compared to reveal the coupling effects on the dynamic design of LNG tanks.
To further demonstrate the effects of the natural characteristics affected by different interactions on the dynamic responses involving the dynamic strength, stiffness and vibration environment problems considered in dynamic design, the numerical simulations of the studied systems subject to regular sea wave excitations and earthquake excitations are carried out. The dynamic displacements for stiffness analysis, the dynamic stress for strength analysis and vibration level for dynamic environment analysis are presented and discussed. Guidelines provided in this paper maybe useful for dynamic designs of LNG tank operating in complex marine environments.
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Submitted date: 15 January 2008
Published date: June 2008
Additional Information:
Paper OMAE2008-57937
Venue - Dates:
27th International Conference on Offshore Mechanics and Arctic Engineering, , Estoril, Portugal, 2008-06-14 - 2008-06-19
Keywords:
dynamic design, LNG Tank, fluid-structure interaction, dynamic analysis, sea wave excitation, earthquake excitations .
Organisations:
Fluid Structure Interactions Group
Identifiers
Local EPrints ID: 51012
URI: http://eprints.soton.ac.uk/id/eprint/51012
ISBN: 0791838218
PURE UUID: bcf74453-4c81-48d0-8bcb-ff8dcab0241f
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Date deposited: 18 Aug 2008
Last modified: 09 Jan 2022 03:04
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