Abstract
Tank sloshing is widely present in many engineering fields, especially in the field of marine. Due to the trend of large-scale liquid cargo ships, it is of great significance to study the coupled motion response of ships with tanks in beam waves. In this study, the CFD (Computational Fluid Dynamics) method and experiments are used to study the response of a ship with/without a tank in beam waves. All the computations are performed by an in-house CFD solver, which is used to solve RANS (Reynold Average Navier-Stokes) equations coupled with six degrees-of-freedom solid-body motion equations. The Level Set Method is used to solve the free surface. Verification work on the grid number and time step size has been conducted. The simulation results agree with the experimental results well, which shows that the numerical method is accurate enough. In this paper, several different working conditions are set up, and the effects of the liquid height in the tank, the size of the tank and the wavelength ratio of the incident wave on the ship’s motion are studied. The results show the effect of tank sloshing on the ship’s motion in different working conditions.
Highlights
Tank sloshing is possible for ships with tanks under almost all loading conditions, and tank sloshing has a great impact on all kinds of ships with large tanks
Based on OpenFOAM, Jiang et al [13] carried out a numerical simulation of the coupling effect between ship motion and tank sloshing of a simplified LNG-FPSO (Liquefied Natural Gas-Floating Production Storage and Offloading, the equipment is from Korea) ship with a prismatic tank filled with two parts of waves
The simulation results by the in-house CFD solver of ship motion in waves are in good agreement with the experimental results
Summary
Tank sloshing is possible for ships with tanks under almost all loading conditions (except full load and no-load), and tank sloshing has a great impact on all kinds of ships with large tanks. Li et al [12] simulated the time-domain coupling response of tank sloshing and ship motion based on OpenFOAM (Open Field Operation and Manipulation) in Shanghai, China, fully considering the interaction of wave, hull and tank sloshing. Based on OpenFOAM, Jiang et al [13] carried out a numerical simulation of the coupling effect between ship motion and tank sloshing of a simplified LNG-FPSO (Liquefied Natural Gas-Floating Production Storage and Offloading, the equipment is from Korea) ship with a prismatic tank filled with two parts of waves. From the CFD and EFD results, we can obtain the effects of the liquid height in the tank, the size of the tank and the wavelength ratio of the incident wave on the ship motion in several different working conditions.
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