Impact Analysis on Water Entry of Gliding Vehicle using Finite Element Method

Kim, Changyu; Hwang, Youngeun

doi:2017.20.4.467

J. KIMS Technol > Volume 20(4); 2017 > Article

Journal of the Korea Institute of Military Science and Technology 2017;20(4):467-473.
DOI: https://doi.org/10.9766/KIMST.2017.20.4.467

Impact Analysis on Water Entry of Gliding Vehicle using Finite Element Method

Changyu Kim, Youngeun Hwang

The 2nd Aircraft PMO, Agency for Defense Development

유한요소 해석을 통한 활공비행체의 입수충격해석

김찬규, 황영은

국방과학연구소 제2항공체계개발단

Abstract

In this paper, impact characteristics of a water entry gliding vehicle were analyzed using a finite element method. To guarantee the validity of analysis results, a convergence test was performed for several ratios of Euler and Largrange mesh sizes. The impact coefficient was calculated with respect to entry angles and angle of attacks. It can be observed that the impact coefficient was large at a high cross-section gradient and was also affected by cavitation. This study could be useful in the preliminary design stage of a water entry bomb development.

Key Words: Gliding Vehicle, Fluid-Structure Interaction, Finite Element Method, Cavitation