Abstract
The water entry is a classic fluid-structure interaction problem in ocean engineering. The prediction of impact loads on structure during the water entry is critical to some engineering applications. In this paper, a multiphase Riemann-SPH model is developed to investigate water entry problems. In this model, a special treatment, a cut-off value for the particle density, is arranged to avoid the occurrence of negative pressure. A remarkable advantage of the present multiphase SPH model is that the real speed of sound in air can be allowed when simulating water-air flows. In the present work, considering the air effect, several typical water entry problems are studied, and the evolution of multiphase interface, the motion characteristic of structure and complex fluid-structure interactions during the water entry are analyzed. Compared with the experimental data, the present multiphase SPH model can obtain satisfactory results, and it can be considered as a reliable tool in reproducing some fluid-structure interaction problems.
Highlights
The study on water entry problems has been a long-standing subject in ocean engineering
Different from most existing multiphase models in Smoothed Particle Hydrodynamics (SPH), this model takes the real speed of sound in air into account
Thanks to the good performance of this multiphase model, the real speed of sound in air is considered for these water entries
Summary
The study on water entry problems has been a long-standing subject in ocean engineering. Marrone et al [18] conducted a comprehensive numerical study on predicting slamming loads of a LNG tank insulation panel with a deadrise angle of 4◦ using the Riemann-ALE-SPH method For this case, 3D effects and air-cushioning play relevant roles because of its small deadrise angle. This paper is dedicated to providing a study on water entries with air flow based on a multiphase Riemann-SPH model proposed by Meng et al [19], which is our previous work. Results show that this multiphase model proves to be accurate and robust for predicting the motion of structure and impact loads during the water entry Another motivation of this work is to test the performance of the present multiphase SPH model in simulating the whole process of a rigid body into static water.
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