Water entry of sphere with porous hollow structure
Source abstract
Abstract
Based on the numerical method of large eddy simulation, research on the cavity evolution and multiphase flow characteristics of porous hollow spheres is conducted. An experimental platform for hollow spheres is established, and numerical simulation results are compared with experimental data to verify the feasibility of the numerical method. The results indicate that, compared to hydrophilic solid spheres, significant cavities are generated during water entry. A clear jet phenomenon is formed in the central through-hole of the porous hollow sphere, and the internal jet presents a network shape and converges to the top position inside the porous hollow sphere. The hydrodynamic force coefficient of hollow spheres is smaller than that of solid spheres. As the initial velocity increases, the shape of the cavity gradually becomes more fluctuating, and the first peak value of the hydrodynamic force coefficient gradually increases. The smaller the initial velocity, the larger the second peak value of the porous hollow sphere after pinch-off. Increasing the diameter and hole diameter will significantly increase the peak value of the hydrodynamic force coefficient when impacting the water surface, while increasing the thickness and number of holes can increase the peak value of the hydrodynamic force coefficient after cavity collapse.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Fluid Dynamics Simulations and Interactions · Fluid Dynamics and Heat Transfer · Surface Modification and Superhydrophobicity
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Mechanical and Electrical Engineering, Huainan Normal University 1 , Huainan 232000,
School of Mechanical Engineering, Suzhou University of Science and Technology 2 , Suzhou 215009,
School of Astronautics, Harbin Institute of Technology 3 , Harbin 150001,
School of Naval Architecture and Ocean Engineering, Dalian University of Technology 4 , Dalian 116081,
School of Energy and Environmental Engineering, Hebei University of Technology 5 , Tianjin 300131,
College of Shipbuilding Engineering, Harbin Engineering University 6 , Harbin 150006,
Funding
National Natural Science Foundation of China · China Postdoctoral Science Foundation · Natural Science Foundation of Jiangsu Province · Science and Technology on Underwater Information and Control Laboratory · Science Foundation of Huainan Normal University
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