자유수면 밑을 전진하는 세장체에 작용하는 수면흡입력의 추정
Free Surface Suction Force Acting on a Submerged Slender Body Moving Beneath a Free Surface
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In this paper, the steady lift force acting on a slender body moving beneath regular wave systems of arbitrary wavelengths and directions of propagation is considered. The momentum conservation theorem and the strip method are used to obtain the hydrodynamic forces acting on the body and affecting its motions on the assumption that the body is slender. In order to obtain the vertical steady force acting on it, or the free surface suction force, the second-order hydrodynamic forces caused by mutual interactions between the components of the first-order hydrodynamic force are averaged over time. The validity of the method is tested by comparison of the calculated results with experimental data and found to be satisfactory. Through some parametric calculations performed for atypical model, some useful results are obtained as to the depth of submergence of the body, wavelengths, directions, etc.
Abstract
In this paper, the steady lift force acting on a slender body moving beneath regular wave systems of arbitrary wavelengths and directions of propagation is considered. The momentum conservation theorem and the strip method are used to obtain the hydrodynamic forces acting on the body and affecting its motions on the assumption that the body is slender. In order to obtain the vertical steady force acting on it, or the free surface suction force, the second-order hydrodynamic forces caused by mutual interactions between the components of the first-order hydrodynamic force are averaged over time. The validity of the method is tested by comparison of the calculated results with experimental data and found to be satisfactory. Through some parametric calculations performed for atypical model, some useful results are obtained as to the depth of submergence of the body, wavelengths, directions, etc.
참고문헌 (3)
- Ogilvie T.F., "First- and Second-Order Forces on a Cylinder Submerged under a Free Surface", J. of Fluid Mechanics, 16, pp.451~472 (1963)
- The Second-Order Time-average Vertical Force and Moment on a Submerged Slender Body Moving beneath a Regular Wave System’, "Newman J.N.", NSRDC, ~, pp.Technical Note 170 (1970)
- Lee C. M., "The Vertical Mean Force and Moment of Submerged Bodies under Waves", pp.231~245 (1971), J. of Ship Research