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EXPERIMENTAL STUDY AND NUMERICAL SIMULATION OF THE WATER ENTRY OF A SHIP-LIKE SYMMETRY SECTION WITH AN OBVIOUS BULBOUS BOW

Abstract

A bulbous bow is a typical ship structure. Due to the influence of the bulbous bow, complex flow separation and gas capture phenomena may appear during the water entry of ship-like sections. In this paper, experimental and numerical studies on the water entry of a ship-like section with an obvious bulbous bow are carried out. Two thin plates are installed at both ends of the test model to ensure that the flow field during the impact process is approximately twodimensional. The free-fall drop test is carried out in the test rig equipped with guide rails. By changing drop heights, impact pressure on the model surface with different initial impact velocities is measured. A numerical model for simulating the water entry of the ship-like section is established by using the Computational Fluid Dynamics (CFD) method, based on the Navier-Stokes equations. Reasonable time steps and mesh size are determined by convergence analysis. Four different flow models are used in the numerical analysis. It is found that the K-Epsilon turbulence model can present the most reasonable numerical prediction by comparing numerical results with the experimental data. Furthermore, the influence of the bulbous bow on the impact loads is numerically studied by using the validated numerical model. It suggests that the bulbous bow has little effect on the impact force acting on the bow-flared area but, in the position near the bulbous bow, the pressure will be affected by the second slamming and the air cushion.

Keywords:

Water entry, Bow-flare sections, Slamming, Computational Fluid Dynamics

Details

Issue
Vol. 28 No. 3(111) (2021)
Section
Latest Articles
Published
14-10-2021
DOI:
https://doi.org/10.2478/pomr-2021-0031
Licencja:
Creative Commons License

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Open Access License

This journal provides immediate open access to its content under the Creative Commons BY 4.0 license. Authors who publish with this journal retain all copyrights and agree to the terms of the CC BY 4.0 license.

 

Authors

  • Qiang Wang

    Dalian Maritime University
  • Pengyao Yu

    Dalian Maritime University
  • Boran Zhang

    Dalian Maritime University
  • Guangzhao Li

    Dalian Maritime University

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