Numerical Study on Coupling Effects of FPSO Ship Motion and LNG Tank Sloshing in Low-Filling Conditions

ZHUANG Yuan; WAN De-cheng

doi:10.21656/1000-0887.370516

Volume 37 Issue 12

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Article Navigation > Applied Mathematics and Mechanics > 2016 > 37(12): 1378-1393

ZHUANG Yuan, WAN De-cheng. Numerical Study on Coupling Effects of FPSO Ship Motion and LNG Tank Sloshing in Low-Filling Conditions[J]. Applied Mathematics and Mechanics, 2016, 37(12): 1378-1393. doi: 10.21656/1000-0887.370516

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Numerical Study on Coupling Effects of FPSO Ship Motion and LNG Tank Sloshing in Low-Filling Conditions

doi: 10.21656/1000-0887.370516

State Key Laboratory of Ocean Engineering(Shanghai Jiao Tong University);School of Naval Architecture, Ocean & Civil Engineering, Shanghai Jiao Tong University;Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai 200240, P.R.China

Funds: National Natural Science Foundation of China(51379125; 51490675; 11432009; 51579145; 11272120) and the Chang Jiang Scholars Program of China(T2014099)

Received Date: 2016-11-17
Rev Recd Date: 2016-12-09
Publish Date: 2016-12-15

Abstract

Abstract

In this paper, numerical simulations of FPSO ship motion coupled with LNG tank sloshing with low-filling ratios are conducted. The fully coupled problem is addressed with our own unsteady RANS solver: naoe-FOAM-SJTU developed based on the open source tool libraries of OpenFOAM. The internal tank sloshing and external wave flow are solved simultaneously. The FPSO model includes 2 LNG tanks. For the ship 3-DOFs are released in the regular beam waves. The filling ratios of the 2 tanks are 20%~20%, lower than the external free surface. This kind of low-filling condition reduces ship roll motion significantly, and produces complex free surface shapes in tanks. 4 different incident wave frequencies are considered in the simulation in comparison with the existing experimental data. The comparison shows that the numerical results are in good agreement with the experimental data, proving the reliability of the proposed method. The filling conditions with large wave amplitudes are studied further, and due to the coupling effect, violent sloshing occurs in tanks and impulsive pressure forms on bulkhead.
- LNG sloshing,
- coupled motion,
- low-filling condition,
- naoe-FOAM-SJTU solver

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References(15)

References

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