수중 폭발 시뮬레이션을 위한 경계 요소법 기반의 수치 해석 기법 연구
A Study on BEM-Based Numerical Simulation Technique for Underwater Explosions
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초록
Recoverability and vulnerability of navy ships under underwater explosion are critical verification factors in the acquisition phase of navy ships. This paper aims to establish numerical analysis techniques for the underwater explosion of navy ships. Doubly Asymptotic Approach (DAA) Equation of Motion (EOM) of primary shock wave and secondary bubble pulse proposed by Geers-Hunter was introduced. Assuming a non-compressive fluid, reference solution of the DAA EOM of Geers-Hunter using Runge-Kutta method was derived for the secondary bubble pulse phase with an assumed charge conditions. Convergence analyses to determine fluid element size were performed, suggesting that the minimum fluid element size for underwater explosion analysis was 0.1 m. The spherical and cylindrical fluid domains were found to be appropriate for the underwater explosion analyses from the fluid domain shape study. Because the element size of 0.1 m was too small to be applied to the actual navy ships, a very slender beam with the square solid section was selected for the study of fluid domain existence effect. The two underwater explosion models with/without fluid domain provided very similar results in terms of the displacement and stress processes.
Abstract
Recoverability and vulnerability of navy ships under underwater explosion are critical verification factors in the acquisition phase of navy ships. This paper aims to establish numerical analysis techniques for the underwater explosion of navy ships. Doubly Asymptotic Approach (DAA) Equation of Motion (EOM) of primary shock wave and secondary bubble pulse proposed by Geers-Hunter was introduced. Assuming a non-compressive fluid, reference solution of the DAA EOM of Geers-Hunter using Runge-Kutta method was derived for the secondary bubble pulse phase with an assumed charge conditions. Convergence analyses to determine fluid element size were performed, suggesting that the minimum fluid element size for underwater explosion analysis was 0.1 m. The spherical and cylindrical fluid domains were found to be appropriate for the underwater explosion analyses from the fluid domain shape study. Because the element size of 0.1 m was too small to be applied to the actual navy ships, a very slender beam with the square solid section was selected for the study of fluid domain existence effect. The two underwater explosion models with/without fluid domain provided very similar results in terms of the displacement and stress processes.
참고문헌 (18)
- Coles, J.S., "Underwater Explosion Research", pp.1085~1105 (1946), Office of Naval Research
- DeRuntz, J. A., "The Underwater Shock Analysis (USA) Manual", Unique Software Applications, ~ (1996)
- Unclassified data from classified source. in Explosion Effects and Properties: Part II. Explosion Effects in Water, "Farley, T.E.", NSWC, ~, pp.NSWC (1978), WOL TR 76-116
- Geers, T. L., "An integrated wave-effects model for an underwater explosion bubble", Journal of Acoustic Society of America, 111(4), pp.1584~1601 (2002)
- Hamashima, H., "Behavior of bubble pulse in food processing using underwater shock wave", International Journal of Multiphysics, 4(2), pp.113~124 (2010)
- Effect of bubble migration on explosion-induced whipping in ships, "Hicks, A. N.", Naval Ship Research and Development Center, 3301~, pp.Technical Report No. 3301 (1970)
- 김재현, "ALE기법을 이용한 수중함의 수중폭발 충격응답 해석에 관한 연구", 한국해양환경•에너지학회지, 10(4), pp.218~226 (2007), 한국해양환경·에너지학회
- 김성범, "수중폭발로 인한 파이프의 동적 응답해석", 대한토목학회논문집(국문), 34(1), pp.9~16 (2014), 대한토목학회[DOI]
- 권정일, "해석모델링 방법에 따른 선체거더의 수중폭발 휘핑응답 비교", 대한조선학회 논문집, 42(6), pp.631~636 (2005), 대한조선학회
- 권정일, "휘핑계수-수중폭발 가스구체 압력파 크기의 척도", 대한조선학회 논문집, 42(6), pp.637~643 (2005), 대한조선학회
- "LS-Dyna Theory Manual" (2020)[URL]
- 이상갑, "수중폭발 충격파와 가스구체 압력파를 함께 고려한 구조물의 동적응답해석", 대한조선학회 논문집, 44(2), pp.148~153 (2007), 대한조선학회
- 이우동, "3차원 수치파동수조에서 수중발파에 의한 수면파의 전파해석", 한국해양공학회지, 33(4), pp.364~376 (2019), 한국해양공학회[DOI]
- Mair, H. U., "Review : Hydrocodes for structural response to underwater explosions", Shock and Vibration, 6(2), pp.81~96 (1999)
- Similitude equations for explosives fired underwater, "Price, R. S.", NSWC, ~, pp.Technical Report NSWC TR 80-299 (1979)
- Snay, H. G., "Hydrodynamics of underwater explosions", Symposium on Naval Hydrodynamics, pp.325~352 (1956), National Academy of Sciences
- Simulia, "Abaqus User Manual", ~ (2018)
- FLNG개념설계 단계에서 SMR 및 DMR 액화공정의 잠재적 폭발위험도 비교, "한국해양공학회지", 2018, 213~214, pp.한국해양공학회, https: