직교격자를 이용한 단순 세장 구조물의 와유기 진동 해석
Vortex-Induced Vibration of Simple Slender Structure Using Cartesian Mesh
2
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
For long slender offshore structures, such as cables and pipe lines, their interaction with surrounding fluid flow becomes an important issue for global design of ocean systems. We employ a long circular cylinder as a representative case of slender offshore structure. A flexibly mounted cylinder in cross-flow generates complex vortex shedding and results in oscillation of the structure. In this paper, flow behind a circular cylinder at Re=100 is simulated. The vortex shedding pattern and flow induced motion are examined in the cross flow configuration as well as with various yaw-angled configurations. The“Lock-in”phenomenon is also observed when reduced velocity is approximately 4.0. The MAC Grid system, which is the typical grid system for Cartesian mesh and pressure correction methods, are used for solving the incompressible Navier-Stokes equations. Predictor/Corrector method is applied for obtaining a non-linear response of structure at the flexibly mounted. The existance and motion of the body is represented by the immersed boundary technique.
Abstract
For long slender offshore structures, such as cables and pipe lines, their interaction with surrounding fluid flow becomes an important issue for global design of ocean systems. We employ a long circular cylinder as a representative case of slender offshore structure. A flexibly mounted cylinder in cross-flow generates complex vortex shedding and results in oscillation of the structure. In this paper, flow behind a circular cylinder at Re=100 is simulated. The vortex shedding pattern and flow induced motion are examined in the cross flow configuration as well as with various yaw-angled configurations. The“Lock-in”phenomenon is also observed when reduced velocity is approximately 4.0. The MAC Grid system, which is the typical grid system for Cartesian mesh and pressure correction methods, are used for solving the incompressible Navier-Stokes equations. Predictor/Corrector method is applied for obtaining a non-linear response of structure at the flexibly mounted. The existance and motion of the body is represented by the immersed boundary technique.
참고문헌 (12)
- Ahn, H. T, "Strongly coupled flow", structure interactions with a geometrically conservative ALE scheme on general hybrid meshes, 2006, pp.219(2), 671~696
- Ding, H, "Numerical simulation of flows around two circular cylinders by mesh-free least square-based finite difference method", International Journal for Numerical Methods in Fluids, 53(2), pp.305~332 (2007)
- Fadlun, E.A, "Combined Immersed-Boundary Finite-Difference Methods for Three-Dimensional Complex Flow Simulations", Journal of Computational Physics, 161(1), pp.35~60 (2000)
- Harlow, F. H, "Numerical Calculation of Time-Dependent Viscous Incompressible Flow of Fluid with Free Surface", Physics of Fluids, 8(12), pp.2182~2189 (1965)
- Kim, J, "An Immersed-Boundary Finite-Volume Method for Simulations of Flow in Complex Geometries", Journal of Computational Physics, 171(1), pp.132~150 (2001)
- 윤현식, "가상경계법을 사용한 횡단 진동하는 실린더 주위의 유동 해석", 대한조선학회 논문집, 43(3), pp.322~330 (2006), 대한조선학회
- Lai, M.C, "An immersed boundary method with formal second-order accuracy and reduced numerical viscosity", Journal of Computational Physics, 160(2), pp.705~719 (2000)
- Mittal, S, "Finite element study of vortex-induced cross-flow and in-line oscillations of a circular cylinder at low Reynolds number", International Journal for Numerical Methods in Fluids, 31(7), pp.1087~1120 (1999)
- Newman, D. J, "A direct numerical simulation study of flow past a freely vibrating cable", Journal of Fluid Mechanics, 344, pp.95~136 (1997)
- 박종천, "중첩 격자계를 이용한 물체운동의 수치 시뮬레이션", 대한조선학회 논문집, 40(5), pp.5~42 (2003), 대한조선학회
- 신상묵, "Hybrid Cartesian", Immersed Boundary 법을 이용한2차원 변형날개 주위 점성유동 해석, 2006, pp.43(5), 538~549[DOI]
- Williamson, C. H. K, "Vortex formation in the wake of an oscillating cylinder", Journal of Fluids and Structures, 2(4), pp.355~381 (1988)