Numerical studies on effects of slosh coupling on ship motions and derived slosh loads

Saripilli, Jai Ram; Sen, Debabrata

doi:10.1016/j.apor.2018.04.009

Cited by 34 publications

(10 citation statements)

References 16 publications

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“…Hasil dari paper ini adalah besaran ketidakpastian dari perhitungan CFD model scale yang dikonversikan ke full scale tergantung dari pendekatan yang dipilih. Penelitian berikutnya dilakukan [4], yang pada papernya membahas tentang gerakan kapal yang dipengaruhi oleh sloshing akibat cairan yang termuat didalam kapal pada berbagai kondisi. Solusi potential flow untuk motion kapal menggunakan boundary element method (BEM) berbasis Green's function, sementara untuk solusi permasalahan sloshing menggunakan finite volume method (FVM) berbasis multiphase interface capturing volume of fluid (VoF) teknik.…”

Section: Pendahulanunclassified

Analisa Tahanan Dan Daya Mesin Pada Kapal Mini LNG Berbasis Simulasi Numerik

2020

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Kebutuhan akan kapal Mini LNG (small LNG carrier) di Indonesia semakin meningkat seiring dengan meningkatnya kebutuhan pasokan LNG dari LNG field ke pulau-pulau di Indonesia bagian timur. Distribusi LNG ke pulau-pulau di Indonesia bagian timur kurang efektif bila menggunakan kapal LNG yang berukuran besar karena tidak adanya infrastruktur pipa gas untuk menyalurkan LNG dari terminal LNG di pelabuhan ke pengguna. Dengan kapal mini LNG maka pendistibusian LNG bisa menggunakan tangki-tangki LNG kecil yang nantinya akan dibawa oleh kendaraan darat setelah kapal bersandar di pelabuhan. Untuk mendesain sebuah kapal mini LNG diperlukan berbagai macam perhitungan yang tepat agar nantinya kapal yang dibangun akan memiliki performa yang baik dan efisien. Salah satunya yang harus dihitung adalah tahanan kapal dan EHP serta BHP untuk memprediksi daya mesin yang akan dipasang. Pada paper ini kajian difokuskan pada perhitungan tahanan kapal dan EHP serta BHP menggunakan metode simulasi numerik. Hasil dari paper ini untuk tahanan kapal desain 1 sebesar 101.01 kN dan untuk desain 2 sebesar 267.06 kN. Pada desain 1 untuk EHP sebesar 519.93 kW dan BHP sebesar 611.68 kW, sedangkan untuk desain 2 EHP sebesar 1373.87 kW dan BHP sebesar 1616.33 kW.

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Section: Pendahulanunclassified

Analisa Tahanan Dan Daya Mesin Pada Kapal Mini LNG Berbasis Simulasi Numerik

2020

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“…Further studies for the detailed analysis of air effects using a large number of particles are expected. In addition, for the engineering standpoints, it is expected to couple two-phase SPH with a mathematical model for ship motion to carry out fully coupled ship-tank simulations, which is similar to those discussed in References [57][58][59][60].…”

Section: D Two-phase Sph Simulationmentioning

confidence: 99%

Experimental Validation of Single- and Two-Phase Smoothed Particle Hydrodynamics on Sloshing in a Prismatic Tank

Trimulyono

Hashimoto

Matsuda

2019

JMSE

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This study aimed to validate the single-phase and two-phase smoothed particle hydrodynamics (SPH) on sloshing in a tank. There have been many studies on sloshing in tanks based on meshless particle methods, but few researchers have used a large number of particles because there is a limitation on the total number of particles when using only CPUs. Additionally, few studies have investigated the influence of air phase on tank sloshing based on two-phase SPH. In this study, a dedicated sloshing experiment was conducted at the National Research Institute of Fishing Engineering using a prismatic tank with a four-degrees-of-freedom forced oscillation machine. Three pressure gauges were used to measure local pressure near the corners of the tank. The sloshing experiment was repeated for two different filling ratios, amplitudes, and frequencies of external oscillation. Next, a GPU-accelerated three-dimensional SPH simulation of sloshing was performed using the same conditions as the experiment with a large number of particles. Lastly, two-dimensional sloshing simulations based on single-phase and two-phase SPH were carried out to determine the importance of the air phase in terms of tank sloshing. Based on systematic comparisons of the single-phase SPH, two-phase SPH, and experimental results, this paper presents a detailed discussion of the role of air-phase in terms of sloshing. The currently achievable accuracy when using SPH is demonstrated together with a few sensitivity analyses of SPH parameters.

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“…Using this principle, Kim (2002) recommended the linear potential flow model with a combined Rankine source and transient Green-function method for the external wave action and the Eulerian equation for the internal sloshing action. Huang et al (2018) and Saripilli and Sen (2018) applied the time-domain transient Greenfunction method to the ship motion response, and the internal sloshing flow was simulated with the nonlinear potential flow model equipped with artificial damping and a Navier-Stokes solver, respectively.…”

Section: Introductionmentioning

confidence: 99%

Coupling analysis for sway motion box with internal liquid sloshing under wave actions

Jiang

Bai

2020

Physics of Fluids

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This work investigates the coupling effects of internal sloshing flow on the sway motion response of rectangular box sections. The impulse-response-function (IRF) method is employed for external wave action, while the viscous twophase flow model with the volume of fluid (VOF) interface capturing technique based on the OpenFOAM R package is adopted for the internal sloshing flow. A new lower critical frequency is defined to understand the coupling effects of the internal sloshing flow, which is the corresponding frequency of the minimal sway motion amplitude. The external wave and internal sloshing forces are out-of-phase at the lower critical frequency. The numerical simulations show that the lower critical frequency is equivalent to the sloshing natural frequency when the internal sloshing flow is in the nonbreaking pattern. The non-breaking sloshing-induced force approaches the same magnitude as the external wave force, which leads to a zero-amplitude sway motion. When the internal sloshing exhibits the breaking phenomenon, a phase transition of the internal sloshing force can occur, which causes the lower critical frequency to be smaller than the sloshing natural frequency. The increased incident wave amplitude or decreased tank breadth can strengthen the nonlinear behavior of the sloshing coupling action. That is, the sway motion response deviates more from the linear sloshing flow results, including the smaller lower critical frequency and the larger minimal sway motion amplitude. However, with the increased breaking-sloshing-induced nonlinearity, the difference in the sway motion response between the coupling and uncoupling results reduces, which implies a lower coupling effect.

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Numerical studies on effects of slosh coupling on ship motions and derived slosh loads

Cited by 34 publications

References 16 publications

Analisa Tahanan Dan Daya Mesin Pada Kapal Mini LNG Berbasis Simulasi Numerik

Analisa Tahanan Dan Daya Mesin Pada Kapal Mini LNG Berbasis Simulasi Numerik

Experimental Validation of Single- and Two-Phase Smoothed Particle Hydrodynamics on Sloshing in a Prismatic Tank

Coupling analysis for sway motion box with internal liquid sloshing under wave actions

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