CFD 기반 유체충격 해석에서 공기 압축성 효과
Air Compressibility Effect in CFD-based Water Impact Analysis
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초록
This paper describes the air compressibility effect in the CFD simulation of water impact load prediction. In order to consider the air compressibility effect, two sets of governing equations are employed, namely the incompressible Navier-stokes equations and compressible Navier-Stokes equations that describe general compressible gas flow. In order to describe violent motion of free surface, volume-of-fluid method is utilized. The role of air compressibility is presented by the comparative study of water impact load obtained from two different air models, i.e. the compressible and incompressible air. For both cases, water is considered as incompressible media. Compressible air model shows oscillatory behavior of pressure on the solid surface that may attribute to the air-cushion effect. Incompressible air model showed no such oscillatory behavior in the pressure history. This study also showed that the CFD simulation can capture the formation of air pockets enclosed by water and solid surface, which may be the location where the air compressibility effect is dominant.
Abstract
This paper describes the air compressibility effect in the CFD simulation of water impact load prediction. In order to consider the air compressibility effect, two sets of governing equations are employed, namely the incompressible Navier-stokes equations and compressible Navier-Stokes equations that describe general compressible gas flow. In order to describe violent motion of free surface, volume-of-fluid method is utilized. The role of air compressibility is presented by the comparative study of water impact load obtained from two different air models, i.e. the compressible and incompressible air. For both cases, water is considered as incompressible media. Compressible air model shows oscillatory behavior of pressure on the solid surface that may attribute to the air-cushion effect. Incompressible air model showed no such oscillatory behavior in the pressure history. This study also showed that the CFD simulation can capture the formation of air pockets enclosed by water and solid surface, which may be the location where the air compressibility effect is dominant.
참고문헌 (19)
- Faltinsen, O.M., "Sea loads on ships and offshore structures" (1990), Cambridge University Press
- Fluent, "Ver. 6.3., User Manual", ~ (2008)
- Godderidge, B, "The effect of fluid compressibility on the simulation of sloshing impacts", Ocean Engineering, 36, pp.578~587 (2009)
- Howison, S.D, "Incompressible water-entry problems at small dead-rise angles", Journal of Fluid Mechanics, 222, pp.215~230 (1991)
- Kang, C.G, "Prediction of Hydrodynamic Impact Loads on Three-Dimensional Bodies", Journal of the Society of Naval Architects of Korea, 27(3), pp.73~88 (1990)
- Kleefsman, K.M.T, "A Volume-of-Fluid based simulation method for wave impact problems", Journal of Computational Physics, 206, pp.363~393 (2005)
- Korobkin, A.A, "Hydrodynamic loads during initial stage of floating body impact", Journal of Fluids and Structures, 21, pp.413~427 (2005)
- Kwon, S.H, "A Note on Slamming", The 6th National Congress on Fluids Engineering, pp.779~780 (2010)
- 이병혁, "받음각을 갖는 평판의 유체 충격 시뮬레이션", 대한조선학회 논문집, 45(1), pp.1~9 (2008), 대한조선학회
- 노인식, "유체 충격압력 시계열의 모델링에 관한 기초 연구", 대한조선학회 논문집, 47(2), pp.242~247 (2010), 대한조선학회
- Scardovelli, R, "Direct numerical simulation of free-surface and interfacial flow", Annual Review of Fluid Mechanics, 31, pp.567~603 (1999)
- 신현경, "낙하실험에 의한 슬래밍 충격의 실험 연구", 대한조선학회 논문집, 47(3), pp.410~420 (2010), 대한조선학회
- Sun, H, "Water impact of horizontal circular cylinders and cylindrical shells", Applied Ocean Research, 28, pp.299~311 (2006)
- Wu, G.X., "Hydrodynamic force on a rigid body during impact with liquid", Journal of Fluids and Structures, 12, pp.549~559 (1998)
- Wu, G. X, "Numerical simulation and experimental study of water entry of a wedge in free fall motion", Journal of Fluid and Structures, 19, pp.277~289 (2004)
- Yoon, B.S, "Lagrangian Finite Element Analysis of Water Impact Problem", Journal of the Society of Naval Architects of Korea, 28(1), pp.60~68 (1991)
- 염덕준, "2차원 쐐기형 구조물의 슬래밍 현상에 대한 수치 유동해석", 대한조선학회 논문집, 45(5), pp.477~486 (2008), 대한조선학회
- Zhang, Y, "A level set immersed boundary method for water entry and exit", Communication in Computational Physics, 8, pp.265~288 (2010)
- Zhao, R, "Water Entry of Twodimensional Bodies", Journal of Fluid Mechanics, 246, pp.593~612 (1993)