高速平板着水数值模拟

doi:10.7527/S1000-6893.2017.721498

Abstract

Abstract:

To have a deeper understanding of aircraft ditching, it is crucial to explore the hydrodynamics and mechanism of impact of water-entry objects. This paper numerically investigates the complex physical problems of high speed plate ditching using the finite volume method coupled with the Volume of Fluid (VOF) model. The Unsteady Reynolds-Averaged Navier-Stokes (URANS) equations and the Standard k-ε turbulence model are solved by the finite volume method. The VOF model is applied to capture the air-water interface. The relative motion between the plate and water is handled by the global dynamic mesh method. The high speed ditching of a 2D wedge-shaped body is studied, including the pressure distributions on lower surface of the plate and free surface deformations such as splash formation, movement and air cushion effects. The results show that there is obvious air cushion in the plate, with occurrence of regular air bubbles under the plate at 4° pitching angle, while no occurrence of air bubbles at 10° pitching angle. The water under the plate moves along the bottom of the plate, and the water speed increases dramatically at 10° pitching angle. The negative pressure zone appears significantly at large pitching angle.

Key words: high speed plate, finite volume method, Volume of Fluid (VOF) model, global dynamic mesh, water impact

CLC Number:

V211.3

LU Yujin, XIAO Tianhang, LI Zhengzhou. Numerical simulation of high speed plate ditching[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2017, 38(S1): 721498-721498.

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Numerical simulation of high speed plate ditching

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