A Study of Structure-Fluid Interaction Technique for Submarine LOX Tank under Impact Load of Underwater Explosion

J. Ocean Eng. Technol. 2005;19(1):20-25.

KIM JAE-HYUN;PARK MYUNG-KYU;

Hyundai Heavy Industry Co. Ltd.;Div. of Ocean Systems Engineering, Korea Maritime University;

수중폭발 충격하중을 받는 잠수함 액화산소 탱크의 구조-유체 상호작용 기법에 관한 연구

김재현;박명규;

현대중공업(주) 선박해양연구소 구조연구실;한국해양대학교 해양시스템공학부;

Keywords: Structure-Fluid Interaction, Underwater Explosion, Submarine, Liquified Oxygen (LOX) Tank, Shock Factor, ALE (Arbitrary Lagrangian-Eulerian)

핵심용어: 구조-유체 상호작용, 수중폭발, 잠수함, 액화산소 탱크, 충격계수

Abstract

The authors performed the underwater explosion analysis for the liquified oxygen tank - a kind of fuel tank of a mid-size submarine, and tried to verify the structural safety for this structure. First, the authors reviewed the theory and application of underwater explosion analysis, using a Structure-Fluid Interaction technique and its finite element modeling scheme. Next, the authors modeled the explosive and sea water as fluid elements, the LOX tank as structural elements, and the interface between the two regions as the ALE scheme. The effect on shock pressure and impulse of fluid mesh size and shape are also investigated. Upon analysis, it was found that the shock pressure due to explosion propagated into the water region, and hit the structure region. The plastic deformation and the equivalent stress were apparent at the web frame and the shock mount of LOX structure, but these values were acceptable for the design criteria.