The Effects of Tank Sloshing on LNG Vessel Responses

Lee, S. J.; Kim, M. H.; Lee, D. H.; Shin, Yong Un

doi:10.1115/omae2007-29665

Cited by 8 publications

(4 citation statements)

References 0 publications

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“…The occurrence of sloshing has an impact in the form of impact loads that can cause structural damage to tank components [2]. According to Rognebakke et.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic (Cfd) Simulation on Redesign Baffles of Yogyakarta International Airport Train Fuel Tank

Novia¹,

Asngali²,

Susanto³

et al. 2023

mesin

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The tank is one of the most important components in the train which serves as a place to store train fuel. However, so far the tank has been a component that has gone unnoticed, even though there is a very important issue to consider, namely how the fluid moves in the tank due to the movement of the train while moving. The free movement of the liquid fluid in a tank is called sloshing. Sloshing in the tank can be reduced by adding anti-sloshing in the tank called component baffles. So it is necessary to simulate the sloshing due to the movement of the train by taking into account the value of the vehicle subsystem of the train and the variation of the baffles design used. There are several models of fuel tank baffles used in this study, namely fuel tanks without baffles; longitudinal baffles (2) lateral baffles (1) - existing baffles; longitudinal baffles (3) lateral baffles (3) with circular perforations; and horizontal (2) lateral (1) baffles with circular perforations. This study aims to provide a baffles design configuration that can optimally reduce the sloshing that occurs. So in this study, a simulation of the fuel tank with variations in the baffles was carried out by applying the Computational Fluid Dynamic (CFD) method. From the simulation results, it is concluded that the configuration of longitudinal baffles (3) lateral baffles (3) has the best performance with an effectiveness of 34.33% in reducing sloshing.

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“…The occurrence of sloshing has an impact in the form of impact loads that can cause structural damage to tank components [2]. According to Rognebakke et.…”

Section: Introductionmentioning

confidence: 99%

Computational Fluid Dynamic (Cfd) Simulation on Redesign Baffles of Yogyakarta International Airport Train Fuel Tank

Novia¹,

Asngali²,

Susanto³

et al. 2023

mesin

View full text Add to dashboard Cite

show abstract

“…Lee at al. [11] and Lee and Kim [12] developed a similar method, using convolution integrals of linear hydrodynamic coefficients for ship-motion prediction, and a finite difference method to solve the internal sloshing problem. Bunnik and Veldman [13] also developed a method with a linear potential theory for the radiation/diffraction problem and a VOF method for the sloshing problem.…”

Section: Introductionmentioning

confidence: 99%

A study on the coupling effect between sloshing and motion of FLNG with partially filled tanks

et al. 2018

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This paper discusses the coupling influence of floating LNG (FLNG) motions with internal liquid sloshing. Model experiments were performed in an ocean model basin, and results were compared with numerical calculations. The FLNG model used in our study had 6 square tanks. In order to verify the liquid cargo effect, the FLNG model was tested under two conditions: a liquid-cargo condition and a fixed solid-cargo condition. As for filling level, there were three loading conditions (15%, 50%, and 90% filled). Our numerical scheme solves internal liquid sloshing using a three-dimensional finite difference method, and ship motion by potential theory. The sloshing effect was computed by the time-domain coupled simulation. We obtained good agreement between experimental and numerical results even at the near-natural frequency of sloshing. In both experimental results and numerical simulations, the effect of internal liquid is significant for sway and roll motion. Furthermore, the internal free surface motions obtained by the experiments and numerical simulations showed similar non-linear free surface behavior in the case of low filling.

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“…The second category of methods is based on the Navier-Stokes equation solver for viscous flow. Lee et al [20] investigated effects of tank sloshing on LNG vessel response. The liquid sloshing in a tank is simulated in time domain by a Navier Stokes solver.…”

Section: Introductionmentioning

confidence: 99%

Internal Fluid Effect Inside a Floating Structure: From Frequency Domain Solution to Time Domain Solution

Jin

Magee

Han

et al. 2017

Volume 7B: Ocean Engineering

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Liquid inside a floating structure influences both hydrostatic and hydrodynamic response of the floating structure. Some examples of floating structure with internal liquid are: vessels with roll damping tanks, floating hydrocarbon storage facility, LNG tankers and etc. A floating oil storage tank is considered in this study, which has a cuboid-shaped external wall, cylinder-shaped internal wall and simple structure configurations for its roof and bottom. Influence of internal liquid on the hydrostatic response of floating structures is well established and must be taken into consideration. The internal liquid reduces the stability of floating structures. The focus of this study is the influence of internal liquid on the hydrodynamic response of floating tank. Frequency domain analysis is performed with WAMIT, for partially filled tank with both solid mass and liquid mass. By comparing the different cases, the force induced by the internal liquid on the floating tank is illustrated. Based on the WAMIT calculated radiation damping force for the external flow, Impulse Response Function (IRF) connecting frequency domain and time domain solution is constructed and the force and moment induced by internal liquid is considered as an excitation force. By assuming linear tank motion, the internal liquid induced force is related to the incoming wave by a set of force transfer functions and it is moved to the right hand side of the tank motion equation. In practice, this set of force transfer function due to internal liquid has to be combined with the wave excitation force transfer function and it is the total force transfer function (internal liquid plus wave excitation) to be imported to SIMO. SIMO time domain simulation is performed in regular waves. Motion transfer functions from WAMIT frequency domain and SIMO time domain calculations are compared and reasonable agreement is achieved.

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The Effects of Tank Sloshing on LNG Vessel Responses

Cited by 8 publications

References 0 publications

Computational Fluid Dynamic (Cfd) Simulation on Redesign Baffles of Yogyakarta International Airport Train Fuel Tank

Computational Fluid Dynamic (Cfd) Simulation on Redesign Baffles of Yogyakarta International Airport Train Fuel Tank

A study on the coupling effect between sloshing and motion of FLNG with partially filled tanks

Internal Fluid Effect Inside a Floating Structure: From Frequency Domain Solution to Time Domain Solution

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