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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Druckformat: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v38.i3.10
pages 193-214

Numerical Simulation of Water Entry of Seafloor Mining Tool with Free Fall Motion

Xiaozhou Hu
College of Mechanical and Electrical Engineering, Central South University, Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing Changsha 410083, Hunan, China
Shaojun Liu
College of Mechanical and Electrical Engineering, Central South University, Key Laboratory of Modern Complex Equipment Design and Extreme Manufacturing Changsha 410083, Hunan, China

ABSTRAKT

The hydrodynamic problem of a two-dimensional model of seafloor mining tool entering still water vertically with free fall motion is analyzed based on the velocity potential theory. Simulations are performed using Navier−Stokes numerical method in conjunction with an interface-capturing VOF method employing CFD code Fluent, the time histories of velocity and pressure during the impact process are obtained. Residual air entrained between the bottom of mining tool and free water surface is observed, influence which exerts on impact is discussed, the concept of impact added mass is presented to express the coupled function between air-rigid body-water during water entry process. Two dimensionless ratios are determined which the drop simulations should comply with to simulate an average slam: drop height ratio and mass ratio. The relationships between dimensionless ratios and several important parameters derived from simulation results are discussed. The numerical results can provide an important principle for free fall water entry experiments.


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