The 12th International Conference on Hydrodynamics
18 – 23 september 2016, Egmond aan Zee, The Netherlands
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NUMERICAL STUDY OF IMPACT FORCE OF HIGH SPEED WATER-ENTRY BODIES


Go-down ichd2016 Tracking Number 153

Presentation:
Session: Multiphase Flow
Room: Room 3
Session start: 10:30 Wed 21 Sep 2016

YAO HONG   infinitehong@sjtu.edu.cn
Affifliation: SJTU

Benlong Wang   benlongwang@sjtu.edu.cn
Affifliation:

Hua Liu   hliu@sjtu.edu.cn
Affifliation:


Topics: - Ship hydrodynamics resistance, propulsion, powering, seakeeping, manoeuvrability, slamming, sloshing, impact, green water, - Multiphase flow

Abstract:

ABSTRACT The water-entry of 2D bodies at high impact velocities is studied numerically in this article. The flow model treats the fluid as a compressible mixture of air and water with homogeneous material properties, with the understanding that one or the other of the two constituents is essentially absent in the bulk of the domain. A high-resolution, the Godunov-type method, is employed to solve the governing equations numerically. The fluid flow around a water-entry body is assumed to be inviscid. The gravity effect can be ignored because of the short period of time for the early stage of water entry process. A set of numerical experiments for a water-entry body with different velocities are studied. It turns out that the impact force is found to increase with the velocity as expected. To validate the accuracy of the mixture method, we compare the computed results with the experiment data available. Good agreements between them are obtained.