Test and Analysis of LNG Tank Container Waterway Transportation

Modified 3D Moving Particle Semi-Implicit (MPS) method is used to complete the numerical simulation of the fluid sloshing in LNG tank under multidegree excitation motion, which is compared with the results of experiments and 2D calculations obtained by other scholars to verify the reliability. The cubic spline kernel functions used in Smoothed Particle Hydrodynamics (SPH) method are adopted to reduce the deviation caused by consecutive two times weighted average calculations; the boundary conditions and the determination of free surface particles are modified to improve the computational stability and accuracy of 3D calculation. The tank is under forced multidegree excitation motion to simulate the real conditions of LNG ships, the pressures and the free surfaces at different times are given to verify the accuracy of 3D simulation, and the free surface and the splashed particles can be simulated more exactly.

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Computational Simulation of Boil-Off Gas Formation inside Liquefied Natural Gas Tank Using Evaporation Model in ANSYS Fluent

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.393.839 ◽

2013 ◽

Vol 393 ◽

pp. 839-844 ◽

Cited By ~ 11

Author(s):

Mohamad Shukri Zakaria ◽

Kahar Osman ◽

Mohd Noor Asril Saadun ◽

Muhammad Zaidan Abdul Manaf ◽

Mohd Hafidzal Mohd Hanafi

Keyword(s):

Natural Gas ◽

Gulf Coast ◽

Current Model ◽

Computational Simulation ◽

The United States ◽

Liquefied Natural Gas ◽

Ansys Fluent ◽

Evaporation Model ◽

Gas Formation ◽

Lng Tank

Research on the waste energy and emission has been quite intensive recently. The formation, venting and flared the Boil-off gas (BOG) considered as one of the contribution to the Greenhouse Gas (GHG) emission nowadays. The current model or method appearing in the literature is unable to analyze the real behavior of the vapor inside Liquefied Natural Gas (LNG) tank and unable to accurately estimate the amount of boil-off gas formation. In this paper, evaporation model is used to estimate LNG Boil-Off rate (BOR) inside LNG tank. Using User Define Function (UDF) hooked to the software ANSYS Fluent. The application enable drag law and alternative heat transfer coefficient to be included. Three dimensional membrane type LNG cargos are simulated with selected boundary condition located in the United States Gulf Coast based on average weather conditions. The result shows that the value of BOR agrees well with the previous study done with another model and with International Marine organization (IMO) standard which is less than 0.15% weight per day. The results also enable us to visualize the LNG evaporation behaviors inside LNG tanks.

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Thermal Analysis on the Shell Stiffeners of Double Steel Wall LNG Storage Tank

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.105-107.403 ◽

2011 ◽

Vol 105-107 ◽

pp. 403-407

Author(s):

Xiao Chun Zhang ◽

Yuan Qi Cai

Keyword(s):

Thermal Analysis ◽

Structural Design ◽

Storage Tank ◽

Thermal Field ◽

Local Buckling ◽

Thermal Design ◽

Normal Operation ◽

Analysis Of Results ◽

Design Requirements ◽

Lng Tank

Shell stiffeners are used effectively to prevent preferential local buckling of LNG tank shell. In this paper, Finite element method (FEM) is applied to pay attention to the thermal analysis on the shell stiffeners of double steel wall LNG storage tank. The structural requirements according to British Standard 7777-2:1993 has been considered and then some dimensional adjustments of shell stiffeners are made to evaluate their influence on the thermal field of double steel wall LNG storage tank. Temperature distributions and heat flux of different dimensional shell stiffeners are presented. Though the analysis of results, it puts forward the conclusion that the dimensional design of shell stiffeners used in double steel wall LNG storage tank shall take not only the structural design requirements but also the thermal design ones into consideration in order to finally save cost in both construction and normal operation.

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The Evaluation of Strength for the Corner Block Structure in the LNG Tank using Sloshing Pressure of the Scaled Tank

Journal of the Computational Structural Engineering Institute of Korea ◽

10.7734/coseik.2013.26.5.327 ◽

2013 ◽

Vol 26 (5) ◽

pp. 327-333

Author(s):

Jun Hyeong Park ◽

Si Jong Park ◽

Seong Hoon Kim ◽

Jae Min Choi ◽

In Ki Jun

Keyword(s):

Block Structure ◽

Lng Tank ◽

Sloshing Pressure

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Characteristics of Heat Transfer During Cooling Down Process in a Single Cargo Tank of LNG Carrier

10.3940/rina.ijme.2020.a3.588 ◽

2020 ◽

Vol 162 (A3) ◽

Author(s):

J J Deng ◽

L Y Song ◽

J Xu ◽

B Liu ◽

J S Lu ◽

...

Keyword(s):

Heat Transfer ◽

Deep Understanding ◽

Liquefied Natural Gas ◽

Cfd Model ◽

Heat Transfer Characteristics ◽

Transfer Characteristics ◽

Flow And Heat Transfer ◽

Computational Fluid Dynamics Cfd ◽

Heat Transfer Simulation ◽

Lng Tank

A deep understanding of heat transfer characteristics is essential in evaluating risk and putting forward any option for the Liquefied Natural Gas (LNG) tank cooling down process. A novel Computational Fluid Dynamics (CFD) model was built to perform the flow and heat transfer simulation of the process. The predicted results agreed well with the test data from a prototype LNG tank. Then the heat transfer characteristics of the process were analysed. It was found that the vapour temperature and density were linearly varying and became stable after 2.3 hours. A sudden pressure drop risk was identified during the process, which will cause the inwards collapse risk of the invar membrane. Then the proposals to prevent the risks of the inwards collapsing membrane are presented. The heat transfer characteristics of the vapour and different membrane layers were analysed in detail, and if the suggested option was to be implemented this could save about 39% of LNG consumed.

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