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Numerical Study on the Vertical water exit of A Cylinder with Cavity

China Ocean Engineering 2022年第5期36卷 734-742页

作者： ZHANG Xing-yu LYU Xu-jian FAN Xu-dong School of Energy and Power Engineering Nanjing University of Science and TechnologyNanjing 210094China

When a high-speed body with cavity passes through water-air free surface and exits water,its mechanical environment and dynamic characteristics change significantly due to the great difference in density and viscosity between water and *** focusing on this problem,the Computational Fluid Dynamics(CFD)method is applied to perform numerical calculation on the process of this vapor-liquid-gas flow during the water exit of a high-speed cylinder,with the Volume of Fraction(VOF)multiphase flow interface-capturing techniques and the overset grid *** the verification and validation of the CFD model through mesh convergence study and a water-entry experiment,cavity evolution and flow characteristics including pressure and velocity distribution during the water exit are *** effects of different initial velocities on the pressure distribution and drag characteristics of the cylinder are *** results show that the cavity collapse during water exit causes strong pressure fluctuation on the cylinder;when the cylinder exits water enveloped in a supercavity,the pressure distribution on its wall surface and surrounding water region is relatively uniform,and the drag changes gently,and thus the cylinder has good motion stability.

关键词： water exit cavity CFD

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Numerical Investigation on the Deformation of the Free Interface During water Entry and exit of a Circular Cylinder by Using the Immersed Boundary-Multiphase Lattice Boltzmann Flux Solver

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Journal of Marine Science and Application 2022年第3期21卷 99-113页

作者： Guiyong Zhang Haoran Yan Hong Song Heng Wang Da Hui State Key Laboratory of Structural Analysis for Industrial Equipment School of Naval Architecture EngineeringDalian University of TechnologyDalian 116024China Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration Shanghai 200240China College of Engineering Ocean University of ChinaQingdao 266100China College of Engineering Peking UniversityBeijing 100871China

In this work,the deformation of free interface during water entry and exit of a circular cylinder is investigated numerically by using the two-dimensional(2D)immersed boundary-multiphase lattice Boltzmann flux solver(IB-MLBFS).The fluid domain is discretized by finite volume discretization,and the flux on the grid interface is evaluated by lattice Boltzmann *** the implicit velocity correction and the surface flux correction are implemented by using the immersed boundary-method to consider the fluid-structure interaction and the contact interface between the multiphase fluids and the ***,the water entry of a circular cylinder is simulated and the results are compared with the experiment,which considered the length-diameter ratio of the circular *** reliability of 2D simulation is verified and the deformation of the free interface is well ***,the water exit of a circular cylinder with constant velocity is simulated,which is less *** addition,the results show the advantage of present IB-MLBFS to some ***,the water exit and re-entry of a circular cylinder are presented,and the results present the complex deformation of the free interface and the dynamic response of the moving *** on the numerical results,the free interface of the multiphase fluids is well captured,and the contact interface on the boundary of the moving structure is accurately presented by the IB-MLBFS.

关键词： Free interface water entry water exit Immersed boundary method Lattice Boltzmann flux solver

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