### 高速平板着水数值模拟

1. 南京航空航天大学 航空宇航学院 飞行器先进设计技术国防重点学科实验室, 南京 210016
• 收稿日期:2017-05-25 修回日期:2017-07-04 出版日期:2017-11-30 发布日期:2017-07-04
• 通讯作者: 肖天航 E-mail:xthang@nuaa.edu.cn
• 基金资助:

国防预研项目；江苏省普通高校研究生科研创新计划（KYLX16_0392）；江苏高校优势学科建设工程资助项目

### Numerical simulation of high speed plate ditching

LU Yujin, XIAO Tianhang, LI Zhengzhou

1. National Defense Key Laboratory of Aircraft Advanced Design Technology, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China
• Received:2017-05-25 Revised:2017-07-04 Online:2017-11-30 Published:2017-07-04
• Supported by:

National Defense Pre-research Foundation; Funding of Jiangsu Innovation Program for Graduate Education (KYLX16_0392); A Project Funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions

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.