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| Numerical study on vertical water-entry of cylindrical structure with positive buoyancy and un-closed solid cavity |
| Lu Zhong-lei Wei Ying-jie Wang Cong Chen Chen |
| School of Astronautics, Harbin Institute of Technology，Harbin 150001 |
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Abstract The water-entry impact on the open end of a cylindrical structure with un-closed solid cavity causes air compression and oscillation in the cavity. The coupling between air vibration and structure movement leads to some special flow phenomenon. Based on the homogeneous equilibrium flow theory, three dimensional numerical simulation is carried out to study the vertical water-entry process. The structure used in simulation is a cylindrical shell with positive buoyancy and un-closed solid cavity. The results show that the un-closed solid cavity plays an buffering action; Air movement in the solid cavity can be divided into two processes: the oscillations caused by impact and compressing respectively; Air vibration has high frequency, low amplitude and fast attenuation properties, and brings a disturbance to the shell movement at the sinking period; The open end of the shell inhales and ejects liquid at a same frequency, which lead to a complex fluid field environment. The cavitation wall waves and the cavitation collapse early.
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Received: 02 July 2015
Published: 15 August 2016
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