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Numerical study on the dynamic characteristics of water entry of cavity body using two-phase SPH method

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Abstract

The air usually has a major influence on the water entry of a typical cavity body (cavity body is a hollow, cylindrical, semi-closed structure), which not only lowers the slamming load but also affects the dynamic characteristics of water entry. In this paper, a two-phase smoothed particle hydrodynamics (SPH) model for simulating the water entry of cavity body is presented. The SPH model combined with Riemann solver is improved to deal with the two-phase flows with the discontinuous quantities across the interface. One-sided Riemann problem is used to impose the fluid–structure interaction and a switch-function-based Riemann solver dissipation is formulated to improve the interfacial instability owing to the strong impact. The motion equations of rigid body are incorporated into two-phase SPH model to describe the motion of cavity body. The proposed model is validated by research on the test cases in the published literature. Finally, this work presents a study of water entry of cavity body by experiment and this two-phase SPH method. The dynamics phenomena in the coupling process between cavity body and two-phase flow are investigated. And the effects of air, mass, the sizes and incline angles of cavity body on the dynamic characteristics of cavity body and two-phase flows are shown.

Graphic abstract

An improved two-phase SPH model was used to simulate the water entry of cavity body. The cavity body impacts the water surface and the cavity body is closed by the flooding water. It comes into being open air cavity and water jets. The jet walls protrude and the air cavity is closed. With the increase of the water entry depth, the complex hydrodynamic phenomena can be seen again. The sinking depth shows the law of fluctuation up and down with time.

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Acknowledgements

This work was supported by the National Nature Science Foundations of China (Grant 11972309), the National Natural Science Foundation for Young Scientists of China (Grant 11702220), the Fundamental Research Funds for the Central Universities (Grant 310201901A012), and Overseas Expertise Introduction Project for Discipline Innovation (111 Project) (Grant BP0719007).

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Authors and Affiliations

  1. School of Aeronautics, Northwestern Polytechnical University, Xi’an, 710072, China

    Qiuzu Yang, Fei Xu & Yang Yang

  2. Department of Mechanical Engineering, Technical University of Munich, 85748, Garching, Germany

    Jingyu Wang

  3. ASN Technology Group Co. Ltd, Xi’an, 710065, China

    Anwen Wang & Chunhao Ma

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  1. Qiuzu Yang
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  2. Fei Xu
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  3. Yang Yang
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Correspondence to Fei Xu.

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Executive Editor: Chao Sun

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Yang, Q., Xu, F., Yang, Y. et al. Numerical study on the dynamic characteristics of water entry of cavity body using two-phase SPH method. Acta Mech. Sin. 37, 1072–1089 (2021). https://doi.org/10.1007/s10409-021-01060-8

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  • DOI: https://doi.org/10.1007/s10409-021-01060-8

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